Multistage intelligent drainage system and method for coal mine

Abstract

The invention belongs to the technical field of drainage control, and discloses a coal mine multi-stage intelligent drainage system and method.The method comprises the steps that water sump water level data, coal washing plant water consumption data, sewage treatment plant water receiving capacity data and power grid peak and valley period data are obtained; judging the relationship between the water level of the sump and a safety threshold; when the water level of the water sump does not reach the safety threshold value, the ratio of the water storage speed to the safety speed is judged, and if the ratio is smaller than 1, whether the water sump can drain water to the sewage treatment plant or not is judged by combining the water receiving capacity data of the sewage treatment plant and the power grid peak and valley time period data; when the water level of the water sump reaches a safety threshold value, judging a drainage path and a drainage time node in combination with the water data of the coal cleaning plant and the water receiving capacity data of the sewage treatment plant. Based on multi-dimensional data such as water level, water demand and electricity price, drainage is accurately controlled, different drainage path demands are matched, the manual intervention degree is reduced, manual operation is replaced, the requirement for intelligent coal mine construction is met, and the cost and risk are reduced.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of drainage control, and particularly relates to a coal mine multi-stage intelligent drainage system and method. BACKGROUND

[0002] The coal mine underground drainage system relies on manual operation, for example, the +750m central water pump house and the +500m water pump house in Maliantai coal mine underground, and 1 post worker needs to be arranged per shift.

[0003] According to the water sump water level, the coal washing plant water demand (the coal washing plant has low requirements on water quality), and the sewage treatment plant water receiving capacity, the pump is started and stopped through manual communication, so that the water in the water sump is sent to the coal washing plant or the sewage treatment plant as needed to ensure the safety of underground water storage. This manual control method has problems such as high labor cost, energy waste, frequent start and stop, and does not meet the requirements of the mine intelligent construction in the Guiding Opinions on Accelerating the Development of Coal Mine Intelligence (No. 283 of the Department of Energy).

[0004] Therefore, a coal mine multi-stage intelligent drainage system and method are provided to solve the above problems. SUMMARY

[0005] In view of the deficiencies of the prior art, the purpose of the present application is to provide a coal mine multi-stage intelligent drainage system and method.

[0006] To achieve the above technical purpose, the technical solution adopted by the present application is as follows:

[0007] In the first aspect, the present application provides a coal mine multi-stage intelligent drainage method, including the following contents,

[0008] obtaining water sump water level data, coal washing plant water data, sewage treatment plant water receiving capacity data, and power grid peak valley period data;

[0009] determining the relationship between the water sump water level and the safety threshold;

[0010] when the water sump water level does not reach the safety threshold, determining the ratio of the water sump water storage speed to the safety speed, and if the ratio is less than 1, determining whether the water sump can drain to the sewage treatment plant in combination with the sewage treatment plant water receiving capacity data and the power grid peak valley period data;

[0011] when the water sump water level reaches the safety threshold, determining the drainage path and the drainage time node in combination with the coal washing plant water data and the sewage treatment plant water receiving capacity data.

[0012] In the present application, in order to realize intelligent control of drainage, water sump water level data, coal washing plant water data, sewage treatment plant water receiving capacity data, and power grid peak valley period data are first obtained; the advantages and disadvantages of the drainage action and the real situation reflected by the above data are determined;

[0013] The water sump water level data can be accurately obtained by a water level sensor;

[0014] The coal washing plant water data is provided by the coal washing plant according to its operation arrangement within a certain time;

[0015] The sewage treatment plant water receiving capacity data is provided by the sewage treatment plant, and the water receiving capacity data provided by the sewage treatment plant should include the water receiving capacity data within a certain period of time in the future;

[0016] The power grid peak and valley period data is obtained according to the information announced by the relevant power units. When the power grid electricity is in the peak period, the electricity price is high, and the electricity load is large. At this time, the electricity cost of drainage operation is high, which also increases the burden of the power grid. When the power grid electricity is in the valley period, the electricity price is lowered, and the electricity load is small. At this time, the electricity cost of drainage operation is low, which can avoid increasing the burden of the power grid;

[0017] When judging whether drainage can be carried out and the specific path of drainage, first, the relationship between the water sump water level and the safety threshold is judged, which is based on the idea of safety first in coal mine operation;

[0018] When the water sump water level does not reach the safety threshold, the water in the water sump has not been sufficiently precipitated, and it is not suitable to be transported to the coal washing plant as a water source for coal washing. Although the coal washing plant needs water during the coal washing process and has low requirements for water quality, the water in the water sump comes from groundwater infiltration. During coal mining operation, coal dust, rock powder and dissolved minerals will mix into the water, causing groundwater to be contaminated to some extent, and the water body becomes turbid. If the water in the water sump does not undergo sufficient precipitation, the turbid water cannot undertake the task of coal washing at this time;

[0019] Therefore, in order to alleviate the subsequent drainage pressure and maintain the water level below the safety threshold, in order to improve the safety of underground, the water in the water sump should be sent to the sewage treatment plant for treatment, but on the other hand, based on the consideration of drainage economy, the peak and valley of the power grid during drainage should also be considered. Therefore, we introduce the concept of the ratio of the water sump storage speed to the safety speed. At this time, although the water level in the water sump does not reach the safety threshold, if the ratio is greater than or equal to 1, it means that the water level is rising too fast and the future water storage pressure is large. If no intervention is made in advance, it may lead to a sharp rise in subsequent drainage difficulty and safety risk. If the ratio is greater than or equal to 1, the water in the water sump must be discharged to the sewage treatment plant, without considering the electricity price. If the ratio is less than 1, the peak and valley of the power grid should be considered. Drainage is considered only when the power grid is in the valley period;

[0020] When the sump water level reaches the safety threshold, the water in the sump has been settled for long enough, and the water quality can meet the washing coal demand. If the coal washing plant has water demand at this time, water should be supplied to the coal washing plant first to reduce the cost of purchasing fresh water for the coal washing plant. If the coal washing plant has no water demand, the sump water level reaches the safety threshold at this time, so there is no need to consider the electricity price problem, and the water in the sump must be discharged to the sewage treatment plant.

[0021] In a second aspect, the present application provides a coal mine multi-stage intelligent drainage system for executing the above-mentioned coal mine multi-stage intelligent drainage method, comprising

[0022] A programmable logic controller;

[0023] An electromagnetic valve arranged on the pipeline;

[0024] A sensor for monitoring the water level of the sump.

[0025] In the present application, the programmable logic controller is used to carry control programs and perform signal processing, the sensor is used to monitor the change of the water level, and in another aspect, the storage speed can also be indirectly calculated. The electromagnetic valve is used to control the cutoff and conduction of the drainage pipeline, so as to realize the electric control of the drainage action.

[0026] In some optional examples, the programmable logic controller has a model S7-1200, 64 DI / 32 DO input and output, a working voltage of 24V DC, and a protection level of IP65. It can process data at high speed, output control instructions, and ensure stable operation of the system. The electromagnetic valve has a diameter DN250, a working pressure of 10MPa, and a response time of <1s. It has an explosion-proof level of Ex d. It can quickly switch the pipeline to meet different water demand and has explosion-proof safety performance. The sensor has an accuracy of ±0.01m, a protection level of IP68, and is suitable for the humid environment underground with a working temperature of 0℃-40℃.

[0027] As a preferred technical solution of the present application, it further comprises an upper computer for interacting with the programmable logic controller.

[0028] The present application has the following advantages: based on multi-condition intelligent decision-making, it integrates water level, water demand, electricity price and other multi-dimensional data, accurately controls drainage, matches different drainage path requirements, reduces the degree of manual intervention, replaces manual operation, meets the requirements of intelligent coal mine construction, and reduces cost and risk. BRIEF DESCRIPTION OF DRAWINGS

[0029] The present application can be further illustrated by the non-limiting examples shown in the accompanying drawings;

[0030] Figure 1 The present application is a flowchart of the embodiment. DETAILED DESCRIPTION

[0031] The technical solutions of the present application will be described in detail below with reference to specific embodiments and the accompanying drawings. The embodiments described herein are specific and concrete embodiments of the present application, which are used to illustrate the concept of the present application; these descriptions are all explanatory and exemplary, and should not be understood as limiting the embodiments of the present application and the protection scope of the present application. In addition to the embodiments described herein, those skilled in the art can also employ other technical solutions that are obvious based on the content disclosed in the claims and the specification of the present application, which include technical solutions that make any obvious substitutions and modifications to the embodiments described herein.

[0032] Embodiment 1

[0033] As shown in Figure 1 , the present embodiment provides a multi-stage intelligent drainage method for coal mines, which includes the following contents,

[0034] Obtain water sump water level data, coal washery water consumption data, sewage treatment plant water receiving capacity data, and power grid peak and valley period data.

[0035] Determine the relationship between the water sump water level and the safety threshold value, the safety threshold value is a range value, for example, the safety threshold value is 65% to 99%;

[0036] When the water sump water level does not reach the safety threshold value, determine the ratio of the water sump water storage speed to the safety speed, the water sump water storage speed is the average per minute water storage speed in the past time period, for example, the average per minute water storage speed in the past 3 hours is selected, but in fact, the length of the time period should be determined according to the actual situation of the coal mine underground;

[0037] If the ratio is less than 1, and the water sump water level does not reach the safety threshold value, determine whether the sewage treatment plant has water receiving capacity at the present time and within a future A time period, the future A time period refers to the time required for the water sump water level to reach the 65% safety threshold value from the current water level, and the length of this time period also needs to be determined according to the actual situation of the coal mine underground, because the size, depth, and water storage speed of different water sumps are different;

[0038] If the sewage treatment plant does not have water receiving capacity, the water sump continues to store water;

[0039] If the sewage treatment plant has water receiving capacity, determine whether the power grid is in a valley period during the time period from the time node when the sewage treatment plant has water receiving capacity to the end of the A time period;

[0040] If the power grid is in a valley period, the water sump drains water to the sewage treatment plant when the power grid is in a valley period;

[0041] If the power grid is continuously in a peak period, the water sump continues to store water;

[0042] If the ratio is greater than or equal to 1 and the water sump water level does not reach the safety threshold, it is determined whether the sewage treatment plant has water receiving capacity at the present time and within a future B time period. The future B time period refers to the time required for the water sump water level to reach 65% of the safety threshold from the current water level. Since the water storage speed is fast at this time, the B time period is usually less than the A time period.

[0043] If the sewage treatment plant has water receiving capacity, the water is directly discharged to the sewage treatment plant.

[0044] If the sewage treatment plant does not have water receiving capacity, an emergency signal is sent to notify the administrator to manually send a command to discharge water to the sewage treatment plant after manual communication and coordination with the sewage treatment plant.

[0045] When the water sump water level reaches the safety threshold,

[0046] First, it is determined whether the coal washing plant has water demand at the present time and within a future C time period. If the coal washing plant has water demand at the present time and within the future C time period, the water sump discharges water to the coal washing plant at the time node when the coal washing plant has water demand. The future C time period refers to the time required for the water sump water level to rise from 65% of the safety threshold to 99% of the safety threshold.

[0047] If the coal washing plant does not have water demand at the present time and within the future C time period, it is determined whether the sewage treatment plant has water receiving capacity at the present time and within the future C time period.

[0048] If the sewage treatment plant has water receiving capacity at the present time and within the future C time period, the water sump discharges water to the sewage treatment plant at the time node when the sewage treatment plant has water receiving capacity.

[0049] If the sewage treatment plant does not have water receiving capacity at the present time and within the future C time period, an emergency signal is sent to notify the administrator to manually send a command to discharge water to the sewage treatment plant after manual communication and coordination with the sewage treatment plant.

[0050] If the water sump water level completely exceeds the safety threshold, an emergency discharge operation is automatically implemented.

[0051] In this embodiment, in order to realize intelligent control of water discharge, water sump water level data, coal washing plant water demand data, sewage treatment plant water receiving capacity data, and power grid peak and valley period data are first obtained. The advantages and disadvantages of the discharge action and the real situation reflected by the above data are determined.

[0052] The water sump water level data can be accurately obtained by a water level sensor.

[0053] The coal washing plant water demand data is provided by the coal washing plant according to its own operation arrangement within a certain time.

[0054] The water receiving capacity data of the sewage treatment plant is provided by the sewage treatment plant, and the water receiving capacity data provided by the sewage treatment plant should include the water receiving capacity data in a future period of time;

[0055] The peak and valley period data of the power grid is obtained according to the information announced by the relevant power units. When the power grid is in the peak period, the electricity price is high, and the power load is large. At this time, the electricity cost of the drainage operation is high, which also increases the burden of the power grid. When the power grid is in the valley period, the electricity price is reduced, and the power load is small. At this time, the electricity cost of the drainage operation is low, which can avoid increasing the burden of the power grid;

[0056] When judging whether the drainage can be carried out and the specific path of the drainage, first, the relationship between the water level of the water warehouse and the safety threshold is judged, which is based on the idea of safety first in coal mining operation;

[0057] When the water level of the water warehouse does not reach the 65% safety threshold, the water in the water warehouse has not been precipitated enough, and it is not suitable to be transported to the coal washing plant as the water source for coal washing. Although the coal washing plant needs water during the coal washing process and has low requirements for water quality, the water in the water warehouse comes from groundwater infiltration. During coal mining operation, coal dust, rock powder and dissolved minerals will mix into the water, causing the groundwater to be polluted to some extent, and the water body to become turbid. If the water in the water warehouse is not precipitated enough, the turbid water cannot undertake the task of coal washing at this time;

[0058] Therefore, in order to relieve the subsequent drainage pressure and maintain the water level below the 65% safety threshold to improve the safety of underground coal mining, the water in the water warehouse should be sent to the sewage treatment plant for treatment. On the other hand, based on the consideration of drainage economy, the peak and valley of the power grid during drainage should also be considered. Therefore, we introduce the concept of the ratio of the water storage speed of the water warehouse to the safety speed. At this time, the water level of the water warehouse does not reach the 65% safety threshold, but if the ratio is greater than or equal to 1, it means that the water level rises too fast and the future water storage pressure is large. If no intervention is made in advance, it may lead to a sharp rise in the difficulty of subsequent drainage and an increase in safety risk. If the ratio is greater than or equal to 1, the water in the water warehouse must be discharged to the sewage treatment plant, without considering the electricity price. If the ratio is less than 1, the peak and valley of the power grid should be considered during drainage;

[0059] When the water level of the water warehouse reaches the safety threshold, the water in the water warehouse has been precipitated for a long time, and the water quality can meet the coal washing demand. If the coal washing plant has water demand at this time, the water should be preferentially supplied to the coal washing plant to reduce the cost of purchasing fresh water for the coal washing plant. If the coal washing plant has no water demand, the water level of the water warehouse reaches the safety threshold at this time, so the electricity price does not need to be considered, and the water in the water warehouse must be discharged to the sewage treatment plant;

[0060] If the administrator is unresponsive, the water level continues to rise, and when the water sump water level completely exceeds the safety threshold, an emergency discharge operation is automatically implemented to avoid causing a safety incident underground.

[0061] Embodiment 2

[0062] A coal mine multi-stage intelligent drainage system for executing a drainage method,

[0063] The coal mine multi-stage intelligent drainage system comprises,

[0064] A programmable logic controller, which is selected from a Siemens S7-1200 compact type;

[0065] An electromagnetic valve arranged on the pipeline, which is used to realize switching of on-off and cutoff states of the pipeline and to realize control of a water flow path;

[0066] A sensor for monitoring a water sump water level; and

[0067] A host computer for interacting with the programmable logic controller.

[0068] In this embodiment,

[0069] The programmable logic controller is used to store a program for executing the drainage method and to control reception and transmission of signals, and the S7-1200 type programmable logic controller adopts a 150 MHz processor, a Boolean instruction execution speed of 0.08 μs / instruction, and is capable of running a complex control program. In addition, it has a small size, saves space of a control cabinet, is conducive to a narrow space environment underground a coal mine, and supports expansion of communication modules on both sides, is capable of communicating with a larger number of sensors and electromagnetic valves, meets drainage control requirements underground a coal mine, has 64 DI / 32 DO input and output, a working voltage of 24 V DC, and a protection level of IP65, is capable of processing data at a high speed, outputting control instructions, and ensuring stable operation of the system;

[0070] The electromagnetic valve receives signals from the programmable logic controller, makes a state switching action, and maintains a required time. For example, the electromagnetic valve is selected from a normally closed type, can ensure effective cutoff of the pipeline in the event of unexpected power failure underground a coal mine, and avoid leakage accidents. The electromagnetic valve has a pass DN250, a working pressure of 10 MPa, a response time of <1 s, and an explosion-proof level of Ex d, is capable of quickly switching a pipeline, meets different water connection requirements, and has explosion-proof safety performance;

[0071] For example, the sensor has a precision of ±0.01 m, a protection level of IP68, is suitable for a humid environment underground a coal mine, and has a working temperature of 0℃-40℃.

[0072] The drainage system in the embodiment can effectively perform drainage and water storage operation according to the mutual relationship among the water sump water level data, the coal washing plant water data, the sewage treatment plant water receiving capacity data and the power grid peak and valley period data through the preloading program, reduces the degree of manual intervention, replaces manual operation, meets the intelligent coal mine construction requirement, and reduces the cost and risk.

[0073] The above embodiments only exemplarily illustrate the principles and effects of the present application, and are not used to limit the present application. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes made by those skilled in the art without departing from the spirit and technical thought disclosed by the present application should be covered by the claims of the present application.

Claims

1. A multi-stage intelligent drainage method for coal mines, characterized in that: Includes the following content: (I) Obtain water level data from water tanks, water usage data from coal washing plants, water receiving capacity data from sewage treatment plants, and peak and off-peak period data from the power grid; (II) Determine the relationship between the water level in the reservoir and the safety threshold; (III) When the water level in the reservoir does not reach the safety threshold, determine the ratio of the water storage rate to the safety rate. If the ratio is less than 1, combine the data on the water receiving capacity of the sewage treatment plant and the peak and valley time data of the power grid to determine whether the reservoir can discharge water to the sewage treatment plant. (IV) When the water level in the water tank reaches the safety threshold, the drainage path and drainage time point are determined by combining the water usage data of the coal washing plant and the water receiving capacity data of the sewage treatment plant.

2. The multi-stage intelligent drainage method for coal mines according to claim 1, characterized in that: The safety threshold is a range value.

3. The multi-stage intelligent drainage method for coal mines according to claim 2, characterized in that: In step (III), when the ratio of the water storage rate to the safe rate is less than 1 and the water level in the water tank does not reach the safe threshold, it is determined whether the sewage treatment plant has the capacity to receive water in the present and in the future within time period A. If the wastewater treatment plant does not have the capacity to receive water, the water tank will continue to store water. If the sewage treatment plant has the capacity to receive water, then determine whether the power grid is in a valley period between the time point when the sewage treatment plant has the capacity to receive water and the end of time A. If there are off-peak periods in the power grid, the reservoir will discharge water into the sewage treatment plant when the power grid is in an off-peak period. If the power grid remains at its peak, the water tank will continue to store water.

4. The multi-stage intelligent drainage method for coal mines according to claim 2, characterized in that: In step (III), if the ratio of the water storage rate to the safe rate is greater than or equal to 1 and the water level in the water tank does not reach the safe threshold, it is determined whether the sewage treatment plant has the capacity to receive water in the present and in the future within time period B. If the wastewater treatment plant has the capacity to receive water, then the wastewater will be discharged directly into the wastewater treatment plant. If the wastewater treatment plant does not have the capacity to receive water, an emergency signal will be sent to notify the administrator to communicate and coordinate with the wastewater treatment plant before the administrator manually sends an instruction to discharge water to the wastewater treatment plant.

5. A multi-stage intelligent drainage method for coal mines according to claim 2, characterized in that: In step (III), the water storage rate of the water tank is the average water storage rate per minute over the past time period.

6. The multi-stage intelligent drainage method for coal mines according to claim 2, characterized in that: In step (IV), when the water level in the reservoir reaches the safety threshold, First, determine whether the coal washing plant has a water demand at present and within the next C time period. If the coal washing plant has a water demand at present and within the next C time period, then the water tank will discharge water to the coal washing plant at the time when the coal washing plant has a water demand. If the coal washing plant has no water demand at present and within the next C time period, then determine whether the sewage treatment plant has the capacity to receive water at present and within the next C time period. If the wastewater treatment plant has the capacity to receive water now and within the next time period C, then the water tank will discharge water to the wastewater treatment plant at the point when the wastewater treatment plant has the capacity to receive water. If the wastewater treatment plant is not capable of receiving water at present and within the next C time period, an emergency signal will be sent to notify the administrator to communicate and coordinate with the wastewater treatment plant before the administrator manually sends an instruction to discharge water to the wastewater treatment plant.

7. A multi-stage intelligent drainage method for coal mines according to claim 2, characterized in that: If the water level in the reservoir exceeds the safety threshold, an emergency discharge operation will be automatically initiated.

8. A multi-stage intelligent drainage system for coal mines, characterized in that: A method for implementing a multi-stage intelligent drainage system for coal mines as described in any one of claims 1 to 7, comprising: Programmable logic controller; Electromagnetic valves installed on pipelines; Sensors used to monitor the water level in water tanks.

9. A multi-stage intelligent drainage method for coal mines according to claim 8, characterized in that: It also includes a host computer for interacting with the programmable logic controller.

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