Gas injection drive gas-carrying intelligent extraction system

Abstract

The invention relates to the technical field of coal seam permeability improvement, in particular to a gas injection drive gas-carrying intelligent extraction system which comprises a gas injection parameter intelligent design module, a gas injection parameter fluctuation regulation and control module, a gas injection parameter capturing module and a data optimization and evaluation module. And the gas injection parameter intelligent design module automatically performs optimal design of gas injection parameters according to the physical properties and geological conditions of the coal seam. By analyzing and simulating gas injection effects under different parameter combinations, the unit can provide an optimal gas injection scheme so as to achieve the highest efficiency and the lowest energy consumption; and the gas injection parameter fluctuation regulation and control module automatically adjusts gas injection parameters according to monitored data, and automatically calculates and adjusts the gas injection parameters according to real-time data and a preset gas injection target by establishing a mathematical model and an algorithm so as to realize an optimal gas injection effect. Therefore, the gas injection accuracy and consistency can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of coal seam permeability enhancement, and particularly relates to an intelligent gas injection and carried gas drainage system. Background Art

[0002] With the increase of coal mining depth, shallow resources are becoming increasingly exhausted, and deep mining is imperative. In view of the characteristics of high gas, high stress, and low permeability in deep coal seams, the rapid reduction technology of high gas coal seams has gradually attracted attention and become an important development direction. This technology conforms to the future development trend of multi-disciplinary deepening of the theory of gas injection and carried gas drainage, multi-method collaborative gas injection and carried gas drainage technology, precision of process parameters of gas injection and carried gas drainage, equipment intelligence, and coordinated layout of coal seam injection-drainage-driving-mining.

[0003] To solve the above problems, the applicant proposes an intelligent gas injection and carried gas drainage system. Summary of the Invention

[0004] The purpose of the present invention is to provide an intelligent gas injection and carried gas drainage system to solve the problems in the prior art.

[0005] To achieve the above purpose, the present invention provides the following technical solutions: A gas injection and flow increase dynamic evaluation unit, including an intelligent gas injection parameter design module, a gas injection parameter fluctuation regulation module, a gas injection parameter acquisition module, and a data optimization and evaluation module;

[0006] The intelligent gas injection parameter design module automatically optimizes the gas injection parameters according to the physical properties of coal and geological conditions. By analyzing and simulating the gas injection effects under different parameter combinations, the unit can provide the best gas injection plan to achieve the highest efficiency and the lowest energy consumption;

[0007] The gas injection parameter fluctuation regulation module automatically adjusts the gas injection parameters according to the monitored data. By establishing a mathematical model and algorithm, according to the real-time data and the preset gas injection target, it automatically calculates and adjusts the gas injection parameters to achieve the best gas injection effect;

[0008] The gas injection parameter acquisition module is equipped with gas concentration monitoring equipment to accurately acquire the gas concentration and various parameters during the gas drainage process. The gas injection parameter acquisition module can analyze and process a large amount of data generated during the gas injection process. Through data mining and machine learning technologies, the gas injection parameter acquisition module can extract laws and trends from historical data and make predictions and warnings. This can help operators better understand the characteristics and changes of the gas injection process and make corresponding decisions;

[0009] Based on the effect of ordinary borehole pre-drainage, the data optimization and evaluation module analyzes the drainage effect under different key gas injection parameters. At the same time, based on the quantitative statistics of gas drainage during gas injection and carrying, it analyzes the variation laws of various characteristic parameters during the whole life cycle of borehole drainage, and formulates the evaluation indexes for the effect of gas injection and carrying. Further segmented evaluation and analysis are carried out, and finally a judgment method suitable for the effect of gas injection and carrying gas drainage is formed, and an evaluation report is generated intelligently.

[0010] Optionally, the gas injection parameter fluctuation control module includes a gas supply unit, an adsorption unit, and a gas flow control unit. The gas supply unit is used to mix gas and pure helium, and the gas supply pressure is regulated by a pressure reducing valve at the gas source. The gas source switches between the mixed gas and pure helium through a three-way valve.

[0011] Optionally, the adsorption unit consists of a sample tube and two pneumatic valves. The solenoid valve controls the opening and closing of the pneumatic valves to control the gas inlet and outlet. A pressure sensor is installed between the two pneumatic valves to monitor the pressure of the unit.

[0012] Optionally, the gas flow control unit includes a flow stabilizer valve installed at the gas outlet, which can be used to regulate the gas flow. An external flowmeter is connected to read the specific value of the gas flow during the adsorption process in the control module.

[0013] Optionally, the data optimization and evaluation module includes a CH4 sensor, a CO sensor, a multi-parameter sensor for gas drainage, a quick connector for the drainage pipeline, and a drainage pipe

[0014] Beneficial effects: By setting up the intelligent design module for gas injection parameters, the gas injection parameter fluctuation control module, the gas injection parameter acquisition module, and the data optimization and evaluation module and coordinating them with each other, the rapid reduction of high gas coal seams is achieved. Description of the Drawings

[0015] Figure 1 It is a diagram of the emergency danger safety guarantee technology and equipment according to the embodiment of the present invention;

[0016] Figure 2 It is a schematic diagram of only injection without drainage according to the embodiment of the present invention;

[0017] Figure 3 It is a schematic diagram of injecting and draining simultaneously according to the embodiment of the present invention;

[0018] Figure 4 It is a schematic diagram of injecting first and then draining according to the embodiment of the present invention;

[0019] Figure 5 It is a schematic diagram of pulsed gas injection according to the embodiment of the present invention;

[0020] Figure 6 It is a schematic diagram of drainage monitoring of the drainage pipeline according to the embodiment of the present invention;

[0021] Figure 7 This is the schematic diagram of the CH4 sensor according to the embodiments of the present invention. Specific embodiments

[0022] The following introduces the preferred embodiments of the present invention with reference to the accompanying drawings of the specification to make its technical content clearer and easier to understand. The present invention can be embodied in many different forms of embodiments, and the protection scope of the present invention is not limited to the embodiments mentioned in the text.

[0023] In the drawings, components with the same structure are denoted by the same numerical labels, and components with similar structures or functions everywhere are denoted by similar numerical labels. The size and thickness of each component shown in the drawings are arbitrarily shown, and the present invention does not limit the size and thickness of each component. To make the illustration clearer, the thickness of some components in the drawings is appropriately exaggerated.

[0024] Embodiment 1

[0025] This patent can automatically optimize the design of gas injection parameters according to the physical properties of coal and geological conditions. By analyzing and simulating the gas injection effects under different parameter combinations, the unit can provide the best gas injection plan to achieve the highest efficiency and the lowest energy consumption.

[0026] (1) Based on the relevant theoretical basis of the coal body's own structural characteristics, when establishing the coal body gas drainage control equation considering the gas adsorption-desorption-seepage of the coal body during the gas drainage process, the following assumptions are proposed:

[0027] ① The coal body is an isotropic linear elastic body and satisfies the small deformation assumption;

[0028] ② The gas seepage process in the coal body conforms to Darcy's law;

[0029] ③ The gas adsorption process in the coal conforms to the Langmuir equation;

[0030] ④ In the simulation experiment, the coal body deformation follows Hooke's law of elasticity.

[0031] (2) Simulation scheme design based on the response surface method:

[0032] The response surface analysis method has the advantages of fewer test times, short cycle, high prediction accuracy, and can examine the interaction between factors. In engineering optimization design, not only can the relationship between the response target and the design variables be obtained, but also the optimal combination of the design variables can be obtained to make the objective function reach the optimum, effectively guiding the optimization of process parameters. Reading the literature found that the factors affecting the effect of pre-draining coal seam gas by cross-measure boreholes mainly depend on the coal seam gas content, coal seam gas permeability coefficient, drainage negative pressure, borehole diameter, and borehole spacing.

[0033] The gas injection parameter fluctuation control module can automatically adjust the gas injection parameters according to the monitored data. By establishing mathematical models and algorithms, the unit can automatically calculate and adjust the gas injection parameters based on real-time data and preset gas injection targets to achieve the best gas injection effect. This can improve the accuracy and consistency of gas injection.

[0034] There are three control units under the module:

[0035] (1) Gas supply unit. This unit includes mixed gas and pure helium. The gas supply pressure is regulated by a pressure reducing valve at the gas source, and the gas source can be switched between mixed gas and pure helium through a three-way valve.

[0036] (2) Adsorption unit. This unit consists of a sample tube and two pneumatic valves. The solenoid valve controls the opening and closing of the pneumatic valves to drive the gas, thereby controlling the gas inlet and outlet. A pressure sensor is installed between the two pneumatic valves to monitor the pressure of the unit.

[0037] (3) Gas flow control unit. A flow stabilizer valve is installed at the gas outlet to regulate the gas flow. An external flow meter is provided to read the specific value of the gas flow during the adsorption process in the control module.

[0038] Through the joint cooperation of the three units, the automatic switching of the gas injection pipeline and the real-time monitoring and control of the pressure data are realized.

[0039] Safety guarantee technology for emergency risks during gas injection with different concentrations of gas:

[0040] The so-called emergency risk safety guarantee technology is an important link in gas injection to drive and carry gas underground, and underground construction needs to be carried out on the basis of safety. This technology covers technical measures such as monitoring, early warning, alarm, and emergency response, as shown in Fig. 3. Gas pressure / flow / concentration sensors are installed in the boreholes to monitor the borehole pressure / concentration / flow in real time; safety alarm devices and coal wall monitoring units are arranged in the gas injection area roadway to monitor the gas concentration in the roadway and the changes in the coal wall of the roadway. Alarm thresholds are set for each monitoring parameter to achieve over-limit early warning; when each monitoring parameter is abnormal, an alarm signal is issued, and then the gas injection unit is shut down, and the pipeline network pressure is unloaded. It can only be normally started after the danger is eliminated.

[0041] Gas injection parameter acquisition module

[0042] There is gas concentration monitoring equipment under this unit to accurately acquire the gas concentration and various parameters during the gas drainage process. The unit can analyze and process a large amount of data generated during the gas injection process. Through data mining and machine learning technologies, the unit can extract rules and trends from historical data and conduct prediction and early warning. This can help operators better understand the characteristics and changes of the gas injection process and make corresponding decisions.

[0043] Gas concentration monitoring quantities for different gas injection methods:

[0044] (1) Injection only without extraction: High pressure at the gas injection hole, natural emission from the borehole

[0045] (2) Injection while extracting: High pressure at the gas injection hole, negative pressure extraction at the borehole

[0046] (3) Injection first then extraction: High pressure at the gas injection hole, the extraction hole is closed; subsequently, the gas injection hole is closed, and negative pressure extraction is carried out at the borehole

[0047] (4) Pulse gas injection: Intermittently injecting high-pressure gas at the gas injection hole, continuously extracting data at the extraction hole for optimization and effect detection module

[0048] (1) Principle of the effect detection unit

[0049] Based on the pre-extraction effect of ordinary boreholes, analyze the extraction effects under different key gas injection parameters. At the same time, based on the quantitative statistics of gas extraction during gas injection and carrying, analyze the variation laws of various characteristic parameters during the whole life cycle of borehole extraction, and formulate evaluation indexes for gas injection and carrying effects. Further, conduct segmented evaluation and analysis, and finally form a judgment method applicable to the gas extraction effect of gas injection and carrying, and intelligently generate an evaluation report.

[0050] (2) Composition of the effect detection unit

[0051] The extraction hole of the effect detection unit consists of a CH4 sensor, a CO sensor, a multi-parameter sensor for gas drainage, a quick connector for the extraction pipeline, and an extraction pipe. The functions of each part are as follows: The CH4 sensor monitors the change in the concentration of CH4 in the extraction pipeline; the CO sensor monitors the change in the concentration of CO in the extraction pipeline; the multi-parameter sensor for gas drainage is used to monitor the gas flow rate in the pipeline in real time and summarize the concentrations of the previous two sensors, and obtain the volumes of CH4 and CO that have been extracted in the extraction pipeline; the quick connector for the extraction pipeline is used to quickly pair and connect the extraction pipe and the extraction unit; the extraction pipe is used to divert the gas deep in the hole.

[0052] (3) GD3 Mine-used Multi-parameter Sensor for Gas Drainage

[0053] The GD3 multi-parameter sensor for mine gas drainage (hereinafter referred to as the "multi-parameter sensor") is an intelligent product that meets the requirements of "digital transmission". The sensor has the functions of measuring temperature, pressure, and differential pressure, and can calculate the volume flow of pipeline gas according to the differential pressure. At the same time, it has the function of accessing RS485 type methane sensors and carbon monoxide sensors to measure various monitoring and metering parameters of coal mine gas drainage pipelines, and can automatically calculate various instantaneous quantities, standard conditions flow, pure flow, and cumulative quantity. The sensor can output RS485 signals or frequency signals of temperature, pressure, and flow, and is one of the most advanced on-line pipeline comprehensive parameter monitoring devices in the current coal mine gas drainage monitoring unit. The gas drainage multi-parameter monitoring device is shown in the figure, and the technical parameters of the device have the following characteristics:

[0054] ① The sensor signal output uses digital signal transmission, effectively avoiding anomalies such as false alarms caused by transmission interference, and meeting the requirements of the latest national "digital transmission".

[0055] ② The differential pressure flow element (Wiley bar) adopts an intrinsically safe anti-blocking structure design, the detection element does not contact the fluid, and it has high measurement accuracy, good stability, and a long calibration and maintenance interval.

[0056] ③ GD3 is equipped with a Wiley bar: the flow velocity measurement range is 2 - 45m / s, it is small in size, light in weight, and the plug-in structure is convenient for installation and disassembly, and has obvious advantages in the flow measurement of large-diameter pipelines.

[0057] ④ Real-time density compensation is adopted during flow calculation to avoid measurement errors caused by changes in temperature, pressure, and methane concentration.

[0058] ⑤ It supports the access of RS485 type methane sensors and carbon monoxide sensors, and centralized display and transmission.

[0059] (4) Gas concentration monitoring equipment

[0060] The GJG100J laser methane sensor for coal mines (hereinafter referred to as the "sensor") can be used in coal mine underground or other places with methane to detect the methane gas concentration in the environment or gas drainage pipelines. The sensor has functions such as sound and light alarm, infrared remote control, etc., can display the methane concentration value locally and continuously and automatically convert the methane concentration value into a standard electrical signal and transmit it to the connected equipment. It has the following characteristics:

[0061] ① Adopting the laser detection principle, it has a wide measurement range, high accuracy, good long-term stability, and long service life.

[0062] ② The shell adopts a new waterproof and dustproof design, and the protection level reaches IP65.

[0063] ③ Adopting a new power supply scheme and startup mechanism, the overall power consumption of the machine is lower and the transmission distance is longer.

[0064] ④ Have a perfect fault diagnosis function to ensure that the sensor can be recognized in time after abnormal conditions occur;

[0065] ⑤ Have a "black box" function, which can store records of historical concentration, faults, alarms, operations, etc., and can effectively identify the occurrence of misoperations and false alarms.

[0066] The sensor consists of a power supply circuit, intelligent signal processing, acoustic-optic alarm circuit, laser sampling head, signal conversion circuit, remote control receiving circuit, display circuit, signal output circuit, etc. The circuit working principle block diagram of the sensor is shown in the figure.

[0067] The laser sampling head of the sensor detects the methane concentration based on the tunable semiconductor laser absorption spectroscopy technology. The sensor CPU receives the concentration signal from the laser sampling head, and after calculation and compensation, the methane concentration value is displayed through a digital tube. At the same time, a signal is output to the connected device for remote collection. The sensor can remotely adjust parameters such as zero point, sensitivity, alarm value, etc., and also has a fault self-check function, with simple operation.

[0068] Apply the high-gas coal seam rapid reduction system of the present invention in a coal mine working face, and the specific steps are as follows:

[0069] Determine the gas enrichment area according to the geological conditions of the working face.

[0070] Construct injection holes at the central position of the gas enrichment area and arrange gas drainage holes around.

[0071] Seal the injection holes and drainage holes to ensure that the sealing length meets the requirements.

[0072] Before gas injection, connect the drainage holes to the drainage system and record the initial gas flow rate and concentration.

[0073] Inject nitrogen into the injection holes through the intelligent stable gas supply system, and monitor and record the changes in the gas flow rate and concentration of the drainage holes.

[0074] Adjust the gas injection parameters according to the monitoring data until the expected gas drainage effect is achieved.

[0075] Through practical application, the high-gas coal seam rapid reduction system of the present invention has significantly improved the gas drainage efficiency, reduced the gas concentration in the working face, and ensured the safe and efficient production of the coal mine. The system has the advantages of simple operation, remarkable effect, controllable cost, etc., and has broad application prospects and popularization value.

[0076] The foregoing has shown and described the basic principles, main features and advantages of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, it is intended to embrace all changes that fall within the meaning and scope of the equivalent elements of the claims in the present invention. Any reference signs in the claims should not be construed as limiting the claims involved.

[0077] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An injection gas enhanced flow dynamic evaluation unit, characterized in that, It includes an intelligent design module for gas injection parameters, a fluctuation control module for gas injection parameters, a grabbing module for gas injection parameters, and a data optimization and evaluation module; The intelligent design module for gas injection parameters automatically optimizes the design of gas injection parameters according to the physical properties of the coal seam and geological conditions. By analyzing and simulating the gas injection effects under different parameter combinations, the unit can provide the best gas injection plan to achieve the highest efficiency and the lowest energy consumption; The fluctuation control module for gas injection parameters automatically adjusts the gas injection parameters according to the monitored data. By establishing mathematical models and algorithms, it automatically calculates and adjusts the gas injection parameters based on real-time data and preset gas injection targets to achieve the best gas injection effect; The grabbing module for gas injection parameters is equipped with gas concentration monitoring equipment to accurately grab the gas concentration and various parameters during the gas drainage process. The grabbing module for gas injection parameters can analyze and process a large amount of data generated during the gas injection process. Through data mining and machine learning technologies, the grabbing module for gas injection parameters can extract rules and trends from historical data and make predictions and warnings. This can help operators better understand the characteristics and changes of the gas injection process and make corresponding decisions; The data optimization and evaluation module first establishes benchmark data based on the pre-drainage effect of ordinary boreholes, and then analyzes the drainage effect after adding gas injection parameters. It compares the changes in key indicators such as gas flow rate, concentration, and drainage efficiency of ordinary pre-drainage and gas injection-driven and flow-increasing drainage. At the same time, based on the quantitative statistics of gas drainage during gas injection-driven and flow-increasing, it analyzes the change rules of various characteristic parameters during the whole life cycle of borehole drainage, and formulates evaluation indicators for the gas injection-driven and flow-increasing effect. It further conducts segmented evaluation and analysis, and finally forms a judgment method applicable to the gas injection-driven and flow-increasing gas drainage effect and intelligently generates an evaluation report.

2. The gas injection enhanced flow dynamic evaluation unit according to claim 1, wherein The fluctuation control module for gas injection parameters includes a gas supply unit, an adsorption unit, and a gas flow control unit. The gas supply unit is used to mix gases and inert gases, and the supply pressure is adjusted by a pressure reducing valve at the gas source. The gas source switches between mixed gas and pure helium through a three-way valve.

3. The gas injection enhanced flow dynamic evaluation unit according to claim 2, wherein The adsorption unit consists of a sample tube and two pneumatic valves. The solenoid valve controls the opening and closing of the pneumatic valves driven by gas, thereby controlling the inlet and outlet of gas. A pressure sensor is installed between the two pneumatic valves to monitor the pressure of the unit.

4. The gas injection enhanced flow dynamic evaluation unit according to claim 2, wherein The gas flow control unit includes a flow stabilizer valve installed at the gas outlet, which can be used to regulate the gas flow rate. An external flowmeter is connected to read the specific value of the gas flow rate during the adsorption process in the control module.

5. The gas injection enhanced flow dynamic evaluation unit according to claim 1, wherein The data optimization and evaluation module includes a CH4 sensor, a CO sensor, a multi-parameter sensor for gas drainage, a quick connector for the drainage pipeline, and a drainage pipe.

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