Digital measurement method, digital intelligence system and device for coal bed gas parameters

Abstract

The invention discloses a digital measurement method, a digital intelligence system and a digital intelligence device for coal bed gas parameters, and relates to the technical field of coal bed gas flow measurement. A temperature and pressure sensor is installed in a mine wellhead, and a laser methane concentration sensor is installed on the inner wall of a pipeline at the rear end of an orifice plate of a mine orifice plate flowmeter to collect the temperature and pressure in a mine and the volume fraction of methane and air in coal bed gas, so that the density of the coal bed gas at the corresponding temperature and pressure is determined; according to the density and the pressure difference of fluid in front of and behind an orifice plate of the orifice plate flowmeter in the mine, the gas volume flow of the coal bed gas in the mine pipeline is determined, and the measuring precision of the gas volume flow of the coal bed gas can be improved; the orifice plate of the orifice plate flowmeter is arranged to be a two-layer stacked orifice plate, and the orifice plate on the front side can be replaced when being seriously abraded. Through a digital intelligent system, acquisition, processing, remote transmission and instruction interaction of multiple parameters are realized, a data display function is provided, and acquired data and processed data are displayed in a digital form.

Description

Technical Field

[0001] The present invention relates to the technical field of coalbed methane flow measurement, and in particular to a digital measurement method, digital intelligent system and device for coalbed methane parameters. Background Art

[0002] As a new type of clean energy, the development and utilization of coalbed methane is not only conducive to coal mine safety production and reducing coal mine gas accidents, but also helps to optimize the energy structure and supplement clean energy, which is of great significance to promoting the "dual carbon" goal. The industry has put forward new requirements for the cost control and clean mining capacity of coalbed methane, and urgently needs to improve the accuracy and automation application of flow measurement.

[0003] In the prior art, in the process of coalbed methane extraction, the method of "multiple wells co-extracting and centralized processing" is generally adopted, and a separate control and measurement method is adopted for each mine. However, due to the poor gas environment of mine extraction, traditional orifice flow meters are used on-site to measure the flow of coalbed methane, and the measurement accuracy is low. Summary of the invention

[0004] Based on this, it is necessary to provide a digital measurement method, digital system and device for coalbed methane parameters to address the above technical problems. This method can improve the measurement accuracy of the gas volume flow of coalbed methane.

[0005] The present invention adopts the following technical solutions:

[0006] The present invention provides a digital measurement method for coalbed methane parameters, comprising:

[0007] The temperature and pressure in the mine are collected through temperature and pressure sensors, and the volume fraction of methane and air in the coalbed methane in the mine pipeline is collected through laser methane concentration sensors; the temperature and pressure sensors are installed in the mine wellhead, and the laser methane concentration sensor is installed on the inner wall of the pipeline at the rear end of the orifice plate of the mine orifice flowmeter;

[0008] According to the temperature and pressure in the mine, and the volume fraction of methane and air in the coal-bed methane in the mine pipeline, the density of the coal-bed methane at the corresponding temperature and pressure is determined;

[0009] The density of coalbed methane at the corresponding temperature and pressure and the pressure difference of the fluid before and after the orifice plate of the orifice flowmeter in the mine are substituted into the flow calculation formula of coalbed methane to obtain the gas volume flow of coalbed methane in the mine pipeline, and the gas volume flow is displayed in digital form.

[0010] Preferably, the calculation formula of the density of coalbed methane at the corresponding temperature and pressure is:

[0011]

[0012] Where ρ is the density of coalbed methane at the corresponding temperature and pressure; c i is the volume fraction of methane and air in coalbed methane; p 1 is the pressure in the mine; T 0 is the temperature under standard conditions; p i is the pressure of methane and air in coalbed methane under standard conditions; T 1 is the temperature inside the mine; ρ i is the density of methane and air in coalbed methane under standard conditions.

[0013] Preferably, the flow calculation formula of coalbed methane is:

[0014]

[0015] Among them, Q is the gas volume flow rate of coalbed methane in the mine pipeline; C is the outflow coefficient of the orifice flowmeter; β is the ratio of the orifice diameter of the orifice flowmeter to the diameter of the mine pipeline; d is the orifice diameter of the orifice; Δp is the pressure difference of the fluid before and after the orifice; ρ is the density of coalbed methane at the corresponding temperature and pressure.

[0016] Preferably, the orifice plate of the orifice flowmeter is a two-layer superimposed orifice plate; the method further comprises:

[0017] Detect the layer degree of the orifice plate on the front side of the mine flow direction;

[0018] When the thickness is less than the preset thickness threshold, an alarm signal is issued; the alarm signal is used to prompt the staff to replace the orifice plate.

[0019] Preferably, the volume fraction of methane and air in the coalbed methane in the mine pipeline is collected by a laser methane concentration sensor, including:

[0020] The laser methane concentration sensor emits initial laser light to the coal-bed methane in the mine pipeline, and receives the detection laser light after being absorbed by the coal-bed methane;

[0021] According to the changes in the light intensity of the initial laser and the detection laser, the volume fraction of methane in the coalbed methane is determined;

[0022] The volume fraction of air in coalbed methane is determined based on the volume fraction of methane in the coalbed methane.

[0023] The present invention provides a digital intelligence system, which includes a data acquisition module, a data processing module, a data storage module, a data export module and a data display module;

[0024] The data acquisition module is used to collect the temperature and pressure in the mine through the temperature and pressure sensor, and to collect the volume fraction of methane and air in the coalbed methane in the mine pipeline through the laser methane concentration sensor; the temperature and pressure sensor is installed in the mine wellhead, and the laser methane concentration sensor is installed on the inner wall of the pipeline at the rear end of the orifice plate of the mine orifice flowmeter;

[0025] The data processing module is used to determine the density of the coalbed methane at the corresponding temperature and pressure according to the temperature and pressure in the mine and the volume fraction of methane and air in the coalbed methane in the mine pipeline; and substitute the density of the coalbed methane at the corresponding temperature and pressure and the pressure difference of the fluid before and after the orifice plate of the orifice plate flowmeter in the mine into the flow calculation formula of the coalbed methane to obtain the gas volume flow rate of the coalbed methane in the mine pipeline;

[0026] A data storage module is used to store the temperature, pressure and volume fraction of methane and air in the coalbed methane collected by the data acquisition module, as well as the density and gas volume flow of the coalbed methane at the corresponding temperature and pressure calculated by the data processing module;

[0027] A data export module, used to export the data stored in the data storage module;

[0028] The data display module is used to display the data in the data storage module in a digital form.

[0029] The present invention provides a coalbed methane flow measurement device, comprising:

[0030] The acquisition module is used to collect the temperature and pressure in the mine through the temperature and pressure sensor, and to collect the volume fraction of methane and air in the coalbed methane in the mine pipeline through the laser methane concentration sensor; the temperature and pressure sensor is installed in the mine wellhead, and the laser methane concentration sensor is installed on the inner wall of the pipeline at the rear end of the orifice plate of the mine orifice flowmeter;

[0031] The first determination module is used to determine the density of the coalbed methane at the corresponding temperature and pressure according to the temperature and pressure in the mine and the volume fraction of methane and air in the coalbed methane in the mine pipeline;

[0032] The second determination module is used to substitute the density of coalbed methane at corresponding temperature and pressure and the pressure difference of the fluid before and after the orifice plate of the orifice flowmeter in the mine into the flow calculation formula of coalbed methane, obtain the gas volume flow rate of coalbed methane in the mine pipeline, and display the gas volume flow rate in digital form.

[0033] The present invention provides a computer-readable storage medium, wherein the storage medium stores a computer program, and when the computer program is executed by a processor, the digital measurement method of the above-mentioned coalbed methane parameters is implemented.

[0034] The present invention provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the above-mentioned digital measurement method of coalbed methane parameters when executing the program.

[0035] At least one of the above technical solutions adopted by the present invention can achieve the following beneficial effects:

[0036] In the present invention, a temperature and pressure sensor is installed in the wellhead of the mine, and a laser methane concentration sensor is installed on the inner wall of the pipe at the rear end of the orifice plate of the mine orifice flowmeter. The temperature and pressure sensors are installed in the wellhead of the mine, so that the temperature and pressure in the mine during the coalbed methane mining process can be collected in real time, so as to accurately determine the temperature and pressure of the coalbed methane in the working environment. In addition, since during the coalbed methane mining process, coal powder particles will accumulate on the front side of the orifice plate of the orifice flowmeter, and less coal powder particles enter the rear side of the orifice plate, therefore, the laser methane concentration sensor is installed on the inner wall of the pipe at the rear end of the orifice plate, which has little effect on the collection accuracy of the laser methane concentration sensor; secondly, the shape of the rear end of the orifice plate has little effect on the flow measurement accuracy, and the rear end has little effect on the measurement accuracy of the differential pressure sensor in the orifice flowmeter. Therefore, the volume fraction of methane and air in the coalbed methane in the mine pipeline can be accurately collected by the laser methane concentration sensor, and the differential pressure measurement accuracy of the fluid before and after the orifice plate of the orifice flowmeter is not affected. Therefore, when measuring the gas volume flow rate of coalbed methane in a mine pipeline, the temperature and pressure in the mine are first collected through temperature and pressure sensors, and the volume fraction of methane and air in the coalbed methane in the mine pipeline is collected through a laser methane concentration sensor to calculate the density of the coalbed methane in the mine under the current working environment. In this way, the gas volume flow rate of the coalbed methane in the mine pipeline can be accurately determined through the density and pressure difference of the coalbed methane under the current working environment. In the present invention, multiple sensors are arranged on the basis of traditional orifice flowmeters for measuring pressure difference. Parameters collected by multiple sensors can calculate the working environment parameters in the mine in real time. The gas volume flow rate of the coalbed methane in the mine pipeline is calculated based on the real-time working environment parameters, which can make the calculated gas volume flow rate of the coalbed methane more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0038] Figure 1 A schematic flow chart of a digital measurement method for coalbed methane parameters provided by the present invention;

[0039] Figure 2 A schematic diagram of the installation position distribution of the sensors provided by the present invention;

[0040] Figure 3 A schematic diagram of the distributed structure of the orifice flowmeter provided by the present invention;

[0041] Figure 4 A schematic structural diagram of a coal bed gas flow measurement system provided by the present invention;

[0042] Figure 5 A schematic diagram of a coal bed gas flow measurement device provided by the present invention;

[0043] Figure 6 A schematic diagram of a computer device for realizing a digital measurement method of coalbed methane parameters provided by the present invention. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the specific embodiments of the present invention and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0045] In mining, the following technical problems are mainly encountered in flow measurement: (1) Traditional orifice flowmeters have poor accuracy and lack corresponding designs for the variable gas composition of coalbed methane; (2) In addition to gas components, coalbed methane also contains coal powder particles and liquid water. Even after simple purification treatment, it still contains a certain amount of coal powder particles, which causes wear on the orifice flowmeter; (3) The traditional flow measurement solution is to manually read the pressure difference data of the orifice flowmeter, manually calculate formulas and fill in reports. The flow measurement data of each well lacks automated collection and processing, and cannot provide a data basis for the coalbed methane concentration and flow control of the back-end centralized processing.

[0046] Based on this, the present invention provides a digital measurement method for coalbed methane parameters. The method provides a multi-parameter sensor acquisition solution in view of factors such as large temperature differences in the coalbed methane mining environment and complex gas composition, and optimizes the flow calculation method according to the parameter results of the sensor to improve the accuracy of flow data; and, in view of the problem of wear caused by coal powder particles in coalbed methane measurement, the orifice plate of the orifice flowmeter is designed to be split and replaceable; in view of the problem of lack of automated acquisition and processing of flow measurement data, the flow calculation method is optimized according to the parameter results of the sensor, an intelligent acquisition and calculation solution for the flowmeter is provided, and the accuracy of the measurement data is improved.

[0047] The technical solutions provided by various embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0048] Figure 1The present invention is a flow chart of a digital measurement method for coalbed methane parameters, which specifically includes the following steps:

[0049] S101, collects the temperature and pressure in the mine through temperature and pressure sensors, and collects the volume fraction of methane and air in the coalbed methane in the mine pipeline through laser methane concentration sensors; the temperature and pressure sensors are installed in the mine wellhead, and the laser methane concentration sensor is installed on the inner wall of the pipeline at the rear end of the orifice plate of the mine orifice flowmeter.

[0050] In the coalbed methane mining environment, after simple filtration at the wellhead, the main components of coalbed methane are methane (gas), air and a small amount of coal powder particles. Most of the mines in my country are distributed in North China and Northwest China, and the temperature and pressure change greatly in seasons, morning and evening. The main principle of the orifice flowmeter is to measure the pressure difference of the orifice plate and use the modified Bernoulli formula to calculate the flow. Therefore, according to the complexity of the coalbed methane environment, it is necessary to measure the methane concentration and ambient temperature on the basis of the traditional flowmeter to measure the pressure difference, so as to improve the accuracy of flow measurement and calculation.

[0051] The sensors required include: temperature and pressure sensors, laser methane concentration sensors and differential pressure sensors, and their distribution locations are designed as follows: Figure 2 As shown, the data collected by the temperature and pressure sensor, the laser methane concentration sensor and the differential pressure sensor are transmitted to the personal computer through the collector, and the gas volume flow rate of the coalbed methane can be measured by the personal computer.

[0052] The personal computer mentioned in the present invention can be a server set on a business platform, or a device such as a desktop computer, a notebook computer, etc. that can execute the solution of the present invention. For the convenience of description, the following description is only based on the personal computer as the execution subject.

[0053] Among them, the differential pressure sensor is a sensor that comes with the orifice flowmeter, which is used to measure the differential pressure of the fluid before and after the orifice. Generally, the flange pressure is taken (the front and rear pressure ports are at the same distance from the orifice) to collect the differential pressure of the fluid before and after the orifice; the temperature and pressure sensor includes a temperature sensor and a pressure sensor, which can integrate the temperature and pressure measurement functions into one, integrate temperature and pressure sensitive elements inside the same sensor, and realize the synchronous measurement of temperature and pressure. The temperature sensor and pressure sensor can also be installed separately. The temperature and pressure sensor is installed inside the wellhead and outside the pipeline. The data is directly transmitted to the processor of the personal computer through the sensor to participate in the flow measurement calculation; the laser methane concentration sensor is installed on the inner wall of the pipeline at the rear end of the orifice. This installation position can solve two problems. First, coal powder particles will accumulate on the front side of the orifice, and fewer coal powder particles enter the rear side of the orifice, which has little effect on the accuracy of the methane sensor; secondly, the shape of the rear end of the orifice has little effect on the flow measurement accuracy, and placing it at the rear end also has little effect on the measurement accuracy of the differential pressure sensor.

[0054] Optionally, a temperature and pressure sensor is installed in the mine wellhead; a laser methane concentration sensor is installed on the inner wall of the pipe at the rear end of the orifice plate of the orifice flowmeter; and the volume fractions of methane and air in the coalbed methane in the mine pipeline are collected by the laser methane concentration sensor, including: emitting an initial laser to the coalbed methane in the mine pipeline through the laser methane concentration sensor, and receiving a detection laser after being absorbed by the coalbed methane; determining the volume fraction of methane in the coalbed methane based on the changes in the light intensity of the initial laser and the detection laser; and determining the volume fraction of air in the coalbed methane based on the volume fraction of methane in the coalbed methane.

[0055] Specifically, the temperature and pressure sensor and the laser methane concentration sensor can collect the temperature, pressure, and volume fraction of methane and air in the coalbed methane in real time in the mine, and send the collected temperature, pressure, and volume fraction of methane and air in the coalbed methane to the processor. Alternatively, when the gas volume flow measurement of coalbed methane is required, the processor sends a collection signal to the temperature and pressure sensor and the laser methane concentration sensor, so that the temperature and pressure sensor and the laser methane concentration sensor collect the temperature, pressure, and volume fraction of methane and air in the coalbed methane in the mine.

[0056] The laser methane concentration sensor emits an initial laser of a specific wave field. When the initial laser passes through the coalbed methane containing methane, the methane molecules absorb the initial laser of the specific wave field, causing the intensity of the initial laser to change. According to the Lambert-Beer law, I = I 0 ·e -kcL , where I is the intensity of the detection laser, I 0 is the incident light intensity of the initial laser, k is the absorption coefficient, c is the gas concentration, and L is the optical path length. By measuring the changes in the light intensity of the initial laser and the detection laser, the gas concentration (volume fraction) of methane in coalbed methane can be calculated. It is known that coalbed methane is mainly composed of methane and other gases, most of which are air components, such as nitrogen, oxygen, etc. After determining the volume fraction of methane in coalbed methane, the volume fraction of air in coalbed methane can be approximated by 1-volume fraction of methane = volume fraction of other gases, that is, the difference between 1 and the volume fraction of methane in coalbed methane is determined as the volume fraction of air in coalbed methane.

[0057] S102, determining the density of the coalbed methane at the corresponding temperature and pressure according to the temperature and pressure in the mine and the volume fraction of methane and air in the coalbed methane in the mine pipeline.

[0058] The calculation formula of the density of coalbed methane at the corresponding temperature and pressure is:

[0059]

[0060] Where ρ is the density of coalbed methane at the corresponding temperature and pressure; c iis the volume fraction of methane and air in coalbed methane; p 1 is the pressure in the mine; T 0 is the temperature under standard conditions; p i is the pressure of methane and air in coalbed methane under standard conditions; T 1 is the temperature inside the mine; ρ i is the density of methane and air in coalbed methane under standard conditions.

[0061] Substituting the temperature and pressure in the mine, as well as the volume fraction of methane and air in the coalbed methane in the mine pipeline into formula (1), the density of the coalbed methane at the corresponding temperature and pressure can be obtained, that is, the density of the coalbed methane in the working environment.

[0062] It should be noted that the above calculation formula is designed based on the assumption that the gas composition of coalbed methane is composed of methane and air, and that changes in temperature and pressure only affect the gas density and have nothing to do with the outflow coefficient.

[0063] S103, substitute the density of coalbed methane at corresponding temperature and pressure and the pressure difference of the fluid before and after the orifice plate of the orifice flowmeter in the mine into the flow calculation formula of coalbed methane to obtain the gas volume flow rate of coalbed methane in the mine pipeline; transmit the data collected and calculated by S101 and S102 as well as the pressure difference and gas flow volume over long distances, and display and output them in digital form.

[0064] The flow calculation formula of coalbed methane can be a modified Bernoulli formula, as shown in formula (2).

[0065]

[0066] Among them, Q is the gas volume flow rate of coalbed methane in the mine pipeline; C is the outflow coefficient of the orifice flowmeter; β is the ratio of the orifice diameter of the orifice flowmeter to the diameter of the mine pipeline; d is the orifice diameter of the orifice; Δp is the pressure difference of the fluid before and after the orifice; ρ is the density of coalbed methane at the corresponding temperature and pressure.

[0067] The outflow coefficient C is calibrated using the International Organization for Standardization (ISO) empirical formula, which is as follows:

[0068]

[0069] Where, β is the ratio of the orifice diameter to the pipe diameter; Re D is the pipeline Reynolds number; L 1 L is the ratio of the distance from the upstream pressure tapping of the orifice plate to the upstream edge of the orifice plate to the pipe diameter; 2 It is the ratio of the distance from the downstream pressure tapping of the orifice plate to the upstream edge of the orifice plate to the pipe diameter;

[0070] After obtaining the gas volume flow rate of the coalbed methane in the mine pipeline, the gas volume flow rate can be displayed in digital form; for example, the gas volume flow rate is displayed on a display screen; optionally, the data collected and calculated in S101 and S102 as well as the pressure difference and the gas flow volume can be transmitted over long distances and displayed and output in digital form, that is, the temperature and pressure in the mine, the volume fraction of methane and air in the coalbed methane in the mine pipeline, the density of the coalbed methane at the corresponding temperature and pressure, the pressure difference before and after the orifice plate, and the gas flow volume of the coalbed methane in the mine pipeline are transmitted over long distances, displayed digitally and exported.

[0071] In an exemplary embodiment, the orifice plate of the orifice flowmeter is a two-layer superimposed orifice plate; the embodiment includes: detecting the thickness of the orifice plate on the front side of the mine flow direction; when the thickness is less than a preset thickness threshold, an alarm signal is issued; the alarm signal is used to prompt the staff to replace the orifice plate.

[0072] When the fluid flows through the orifice plate of the orifice flowmeter, the flow rate will increase significantly due to the throttling effect of the orifice plate. In this process, the kinetic energy of the fluid increases, which will produce a strong impact force on the front plate of the orifice flowmeter. In addition, during the coalbed methane extraction process, the coalbed methane contains coal powder particles, which will also cause wear on the front side of the orifice plate. Numerical simulation results show that the wear on the front side of the orifice plate will have a very large impact on the calculation accuracy. Therefore, in the coalbed methane extraction environment, the orifice plate needs to be replaced regularly to ensure maintenance. In order to reduce the replacement cost, the following replaceable design is made: the orifice plate is designed to be two layers, of which the thickness of the front layer is within 2mm (the error will be larger after wear exceeds 2mm), and the front side orifice plate should be replaced in time when the orifice mouth is completely worn or severely worn, such as Figure 3 shown.

[0073] When applying the digital measurement method for coalbed methane parameters provided by the present invention, it is not necessary to Figure 1 The steps are executed in the order shown. The specific execution order of the steps can be determined according to needs, and the present invention does not limit this.

[0074] The above is a digital measurement method for coalbed methane parameters provided by one or more embodiments of the present invention. Based on the same idea, the present invention also provides a corresponding digital intelligent system, such as Figure 4 As shown, the system 100 includes a data acquisition module 101 , a data processing module 102 , a data storage module 103 , a data export module 104 and a data display module 105 .

[0075] The data acquisition module 101 is used to collect the temperature and pressure in the mine through the temperature and pressure sensor, and to collect the volume fraction of methane and air in the coalbed methane in the mine pipeline through the laser methane concentration sensor; the temperature and pressure sensor is installed in the mine wellhead, and the laser methane concentration sensor is installed on the inner wall of the pipeline at the rear end of the orifice plate of the mine orifice flowmeter.

[0076] The data processing module 102 is used to determine the density of the coalbed methane at the corresponding temperature and pressure according to the temperature and pressure in the mine, and the volume fraction of methane and air in the coalbed methane in the mine pipeline; and substitute the density of the coalbed methane at the corresponding temperature and pressure and the pressure difference of the fluid before and after the orifice plate of the orifice flowmeter in the mine into the flow calculation formula of the coalbed methane to obtain the gas volume flow rate of the coalbed methane in the mine pipeline.

[0077] The pressure difference of the fluid before and after the orifice plate of the orifice flowmeter in the mine is measured by the pressure difference sensor provided by the orifice flowmeter.

[0078] The data storage module 103 is used to store the temperature, pressure and volume fraction of methane and air in the coalbed methane collected by the data acquisition module, as well as the density and gas volume flow of the coalbed methane at the corresponding temperature and pressure calculated by the data processing module.

[0079] The data export module 104 is used to export the data stored in the data storage module; the data display module 105 is used to display the data in the data storage module in a digital form.

[0080] The data acquisition module 101 transmits the results collected by the laser methane sensor and the temperature and pressure sensor to the data processing module 102 to calculate the coalbed methane density; the data acquisition module 101 transmits the data collected by the pressure difference sensor to the data processing module 102, and calculates it together with the calculated coalbed methane density result, and uses the flow calculation formula to obtain the flow result; the data results are classified and stored in the data storage module 103, including external collection environment parameters, orifice flowmeter structure parameters and internal processing data (results calculated in the processor); the data export module 104 is used to provide data support for further multi-wellhead flow regulation and concentration control; the data display module 105 provides a reference for operators to take on-site operations.

[0081] The present invention realizes the collection, processing, remote transmission and instruction interaction of multiple parameters through a digital intelligent system, and provides a data display function to display the collected data and processed data in a digital form.

[0082] For the specific definition of the coalbed methane flow measurement system, please refer to the definition of the digital measurement method of coalbed methane parameters in the above text, which will not be repeated here. Each module in the above-mentioned coalbed methane flow measurement system can be implemented in whole or in part by software, hardware and their combination. The above-mentioned modules can be embedded in or independent of the processor in the computer device in the form of hardware, or can be stored in the memory of the computer device in the form of software, so that the processor can call and execute the operations corresponding to the above modules.

[0083] Based on the same idea, the present invention also provides a corresponding coalbed methane flow measurement device, such as Figure 5 shown.

[0084] Figure 5 A schematic diagram of a coalbed methane flow measurement device provided by the present invention, the device 500 comprises:

[0085] The acquisition module 501 is used to collect the temperature and pressure in the mine through the temperature and pressure sensor, and to collect the volume fraction of methane and air in the coalbed methane in the mine pipeline through the laser methane concentration sensor; the pressure difference of the fluid before and after the orifice of the orifice flowmeter in the mine.

[0086] The first determination module 502 is used to determine the density of the coalbed methane at the corresponding temperature and pressure according to the temperature and pressure in the mine and the volume fraction of methane and air in the coalbed methane in the mine pipeline.

[0087] The second determination module 503 is used to substitute the density of coalbed methane at corresponding temperature and pressure and the pressure difference of the fluid before and after the orifice plate of the orifice flowmeter in the mine into the flow calculation formula of coalbed methane, obtain the gas volume flow rate of coalbed methane in the mine pipeline, and display the gas volume flow rate in digital form.

[0088] The specific definition of the coalbed methane flow measurement device can be found in the above-mentioned definition of the digital measurement method of coalbed methane parameters, which will not be repeated here. Each module in the above-mentioned coalbed methane flow measurement device can be implemented in whole or in part by software, hardware and a combination thereof. The above-mentioned modules can be embedded in or independent of the processor in the computer device in the form of hardware, or can be stored in the memory of the computer device in the form of software, so that the processor can call and execute the operations corresponding to the above modules.

[0089] The present invention also provides a computer-readable storage medium, which stores a computer program, which can be used to execute the above Figure 1 Provided is a digital measurement method for coalbed methane parameters.

[0090] The present invention also provides Figure 6 The structural diagram of the computer device shown in FIG. Figure 6As shown in the figure, at the hardware level, the computer device includes a processor, an internal bus, a network interface, a memory, and a non-volatile memory, and may also include other hardware required for the business. The processor reads the corresponding computer program from the non-volatile memory into the memory and then runs it to achieve the above Figure 1 Provided is a digital measurement method for coalbed methane parameters.

[0091] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided by the present invention can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory or optical memory, etc. Volatile memory can include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM).

[0092] The technical features of the above embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of the present invention.

Claims

1. A digital measurement method for coalbed methane parameters, characterized in that: include: The temperature and pressure in the mine are collected by a temperature and pressure sensor, and the volume fraction of methane and air in the coalbed methane in the mine pipeline is collected by a laser methane concentration sensor; the temperature and pressure sensor is installed in the mine wellhead, and the laser methane concentration sensor is installed on the inner wall of the pipeline at the rear end of the orifice plate of the mine orifice flowmeter; Determine the density of the coalbed methane at the corresponding temperature and pressure according to the temperature and pressure in the mine and the volume fraction of methane and air in the coalbed methane in the mine pipeline; The density of the coalbed methane at the corresponding temperature and pressure and the pressure difference of the fluid before and after the orifice plate of the orifice flowmeter in the mine are substituted into the flow calculation formula of the coalbed methane to obtain the gas volume flow of the coalbed methane in the mine pipeline, and the gas volume flow is displayed in digital form.

2. The method according to claim 1, characterized in that The calculation formula of the density of the coalbed methane at the corresponding temperature and pressure is: Where ρ is the density of coalbed methane at the corresponding temperature and pressure; c i is the volume fraction of methane and air in coalbed methane; p1 is the pressure in the mine; T0 is the temperature under standard conditions; p i is the pressure of methane and air in coalbed methane under standard conditions; T1 is the temperature in the mine; ρ i is the density of methane and air in coalbed methane under standard conditions.

3. The method according to claim 1, characterized in that The flow calculation formula of the coalbed methane is: Among them, Q is the gas volume flow rate of coalbed methane in the mine pipeline; C is the outflow coefficient of the orifice flowmeter; β is the ratio of the orifice diameter of the orifice flowmeter to the diameter of the mine pipeline; d is the orifice diameter of the orifice; Δp is the pressure difference of the fluid before and after the orifice; ρ is the density of coalbed methane at the corresponding temperature and pressure.

4. The method according to claim 1, characterized in that: The orifice plate of the orifice flowmeter is a two-layer superimposed orifice plate; the method further comprises: Detecting the thickness of the orifice plate on the front side of the mine flow direction; When the thickness is less than a preset thickness threshold, an alarm signal is issued; the alarm signal is used to prompt the staff to replace the orifice plate.

5. The method according to claim 1, characterized in that The volume fraction of methane and air in coalbed methane in the mine pipeline is collected by a laser methane concentration sensor, including: The laser methane concentration sensor emits an initial laser to the coal-bed methane in the mine pipeline, and receives a detection laser after being absorbed by the coal-bed methane; Determining the volume fraction of methane in the coalbed methane according to changes in the light intensities of the initial laser and the detection laser; The volume fraction of air in the coalbed methane is determined according to the volume fraction of methane in the coalbed methane.

6. A digital intelligence system, characterized in that: The system includes a data acquisition module, a data processing module, a data storage module, a data export module and a data display module; The data acquisition module is used to collect the temperature and pressure in the mine through the temperature and pressure sensor, and to collect the volume fraction of methane and air in the coalbed methane in the mine pipeline through the laser methane concentration sensor; the temperature and pressure sensor is installed in the mine wellhead, and the laser methane concentration sensor is installed on the inner wall of the pipeline at the rear end of the orifice plate of the mine orifice flowmeter; The data processing module is used to determine the density of the coalbed methane at the corresponding temperature and pressure according to the temperature and pressure in the mine and the volume fraction of methane and air in the coalbed methane in the mine pipeline; and substitute the density of the coalbed methane at the corresponding temperature and pressure and the pressure difference of the fluid before and after the orifice plate of the orifice plate flowmeter in the mine into the flow calculation formula of the coalbed methane to obtain the gas volume flow rate of the coalbed methane in the mine pipeline; The data storage module is used to store the temperature, pressure and volume fraction of methane and air in the coalbed methane collected by the data collection module, as well as the density and gas volume flow rate of the coalbed methane at the corresponding temperature and pressure calculated by the data processing module; The data export module is used to export the data stored in the data storage module; The data display module is used to display the data in the data storage module in a digital form.

7. A digital measurement device for coalbed methane parameters, characterized in that: include: The acquisition module is used to collect the temperature and pressure in the mine through the temperature and pressure sensor, and to collect the volume fraction of methane and air in the coalbed methane in the mine pipeline through the laser methane concentration sensor; the temperature and pressure sensor is installed in the mine wellhead, and the laser methane concentration sensor is installed on the inner wall of the pipeline at the rear end of the orifice plate of the mine orifice flowmeter; A first determination module is used to determine the density of the coalbed methane at the corresponding temperature and pressure according to the temperature and pressure in the mine and the volume fraction of methane and air in the coalbed methane in the mine pipeline; The second determination module is used to substitute the density of the coalbed methane at the corresponding temperature and pressure and the pressure difference of the fluid before and after the orifice plate of the orifice flowmeter in the mine into the flow calculation formula of the coalbed methane, obtain the gas volume flow rate of the coalbed methane in the mine pipeline, and display the gas volume flow rate in digital form.

8. A computer-readable storage medium, characterized in that: The storage medium stores a computer program, and when the computer program is executed by a processor, the method according to any one of claims 1 to 5 is implemented.

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