Method, device and equipment for acquiring methane emission factor
By performing desorption experiments and isothermal desorption curve fitting at the coal sampling point, the problem of inaccurate calculation of active methane emission factors in the coal industry was solved, and high-precision acquisition of methane emission factors was achieved.
Patent Information
- Application Number
- CN202410145466.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-01
- Publication Date
- 2025-08-01
AI Technical Summary
In the prior art, the calculation of post-mineral active methane emission factors in the coal industry lacks scientific and accurate methods, resulting in large errors in the calculation of methane emissions in enterprises, especially in low-gas content mines.
By sampling at the preset sampling point of mining coal, placed in a sealed tank for desorption experiments, the isothermal desorption curve is obtained and the isothermal desorption equation is fitted, and the methane emission factor that is active after ore is calculated.
Accurate acquisition of methane emission data in the coal industry has been achieved, and data quality and calculation accuracy have been improved.
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Figure CN120404473A_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to the field of coal, and particularly to the technical field of obtaining methane emission factors. Background Art
[0002] The "2006 IPCC Guidelines for National Greenhouse Gas Inventories" and the "Accounting and Reporting Requirements for Greenhouse Gas Emissions - Part 11: Coal Production Enterprises" (GB / T 32151.11-2018) indicate that, as Figure 1 shown, coal mining 1 and post-mining activities 2 are two key categories of methane fugitive emissions in China's coal industry, and the emissions from these two parts account for a relatively large proportion of China's total methane emissions. As Figure 2 shown, post-mining activities mainly refer to the post-treatment processes such as coal processing, utilization, storage, and transportation. The fugitive emissions of CH4 and CO2 in this part are difficult to accurately measure because coal is mostly in an open or semi-open system in most cases. Currently, the accounting method using emission factors is adopted, that is, the coal production in a period of time multiplied by the methane emission factor is the methane emission in that period. The above standards and guidelines stipulate the default values of methane emission factors, but this default value is generally the average value of a large region or the whole country, resulting in a large difference between the methane emissions calculated by enterprises using the default value and the actual methane emissions, especially in low gas content mines. Therefore, there is an urgent need to develop a convenient, scientific, and accurate calculation method for methane emission factors to improve the quality of methane emission data in the coal industry. Summary of the Invention
[0003] The present disclosure provides a method, device, equipment, and storage medium for obtaining methane emission factors.
[0004] According to the first aspect of the present disclosure, a method for obtaining methane emission factors is provided. The method includes:
[0005] Sampling at a preset sampling point of the mined coal to obtain a target coal sample;
[0006] Placing the target coal sample in a sealed tank;
[0007] Conducting a desorption experiment on the target coal sample in the sealed tank to obtain the isothermal desorption curve of the target coal sample;
[0008] Fitting the isothermal desorption curve to obtain an isothermal desorption equation, where the isothermal desorption equation is an equation about time and methane desorption amount;
[0009] Using the isothermal desorption equation to obtain the methane emission factor of the post-mining activities.
[0010] For the aspects and any possible implementation manners described above, a further implementation manner is provided. Conducting a desorption experiment on the target coal sample in the sealed tank to obtain the isothermal desorption curve of the target coal sample includes:
[0011] During the process of conducting a desorption experiment on the target coal sample in the sealed tank, collecting the gas desorption amount and methane concentration of the sealed tank at each preset sampling time period;
[0012] Multiplying the gas desorption amount and methane concentration collected at each preset sampling time period to obtain the methane desorption amount corresponding to each preset sampling time period;
[0013] Generating the isothermal desorption curve of the target coal sample according to the methane desorption amount corresponding to each preset sampling time period.
[0014] For the aspects and any possible implementation manners described above, a further implementation manner is provided. The method further includes:
[0015] Taking the time when the mined coal is transported to the coal preparation plant as the starting time, and obtaining the duration of the coal washing and processing stage and the duration of the transportation stage of the mined coal;
[0016] The obtaining the methane emission factor of the post - mining activities by using the isothermal desorption equation includes:
[0017] Substituting the duration of the coal washing and processing stage and the duration of the transportation stage into the isothermal desorption equation to obtain the methane emission factor of the post - mining activities.
[0018] For the aspects and any possible implementation manners described above, a further implementation manner is provided. The substituting the duration of the coal washing and processing stage and the duration of the transportation stage into the isothermal desorption equation to obtain the methane emission factor of the post - mining activities includes:
[0019] Substituting the duration of the coal washing and processing stage into the isothermal desorption equation to obtain the first emission factor of the coal washing and processing stage;
[0020] Using the duration of the coal washing and processing stage, the duration of the transportation stage, and the isothermal desorption equation to obtain the second emission factor of the transportation stage;
[0021] Adding the first emission factor and the second emission factor to obtain the methane emission factor of the post - mining activities.
[0022] For the aspects and any possible implementation manners described above, a further implementation manner is provided. The substituting the duration of the coal washing and processing stage into the isothermal desorption equation to obtain the first emission factor of the coal washing and processing stage includes:
[0023] Substitute the duration of the coal washing and processing stage into the isothermal desorption equation to obtain the methane desorption amount in the coal washing and processing stage;
[0024] Divide the methane desorption amount in the coal washing and processing stage by the mass of the target coal sample to obtain the first emission factor.
[0025] In the above aspects and any possible implementation manners, a further implementation manner is provided. The method of obtaining the second emission factor in the transportation stage by using the duration of the coal washing and processing stage, the duration of the transportation stage, and the isothermal desorption equation includes:
[0026] Substitute the sum of the durations between the coal washing and processing stage duration and the transportation stage duration into the isothermal desorption equation to obtain the sum of the methane desorption amounts in the coal washing and processing stage and the transportation stage;
[0027] Substitute the duration of the coal washing and processing stage into the isothermal desorption equation to obtain the methane desorption amount in the coal washing and processing stage;
[0028] Subtract the methane desorption amount in the coal washing and processing stage from the sum of the methane desorption amounts to obtain the methane desorption amount in the transportation stage;
[0029] Divide the methane desorption amount in the transportation stage by the mass of the target coal sample to obtain the second emission factor.
[0030] In the above aspects and any possible implementation manners, a further implementation manner is provided. Obtain the coal output of the mined coal within a preset duration;
[0031] Multiply the methane emission factor of the post - mining activities by the coal output to obtain the methane emission amount of the mined coal within the preset duration.
[0032] According to the second aspect of the present disclosure, an apparatus for obtaining a methane emission factor is provided. The apparatus includes:
[0033] A sampling module, configured to sample at a preset sampling point of the mined coal to obtain a target coal sample;
[0034] A placement module, configured to place the target coal sample in a sealed tank;
[0035] A desorption experiment module, configured to perform a desorption experiment on the target coal sample in the sealed tank to obtain the isothermal desorption curve of the target coal sample;
[0036] A fitting module, configured to fit the isothermal desorption curve to obtain an isothermal desorption equation, where the isothermal desorption equation is an equation about time and methane desorption amount;
[0037] A processing module for obtaining the methane emission factor of post - mining activities by using the isothermal desorption equation.
[0038] According to a third aspect of the present disclosure, there is provided an electronic device. The electronic device includes: a memory and a processor. A computer program is stored on the memory, and when the processor executes the program, the methods described above are implemented.
[0039] According to a fourth aspect of the present disclosure, there is provided a computer - readable storage medium, on which a computer program is stored. When the program is executed by a processor, the method according to the first aspect of the present disclosure is implemented.
[0040] In the present disclosure, through the desorption experiment on the target coal sample in the sealed tank, the isothermal desorption curve of the target coal sample can be obtained. Then, by fitting the isothermal desorption curve, the isothermal desorption equation can be obtained. Furthermore, by using the isothermal desorption equation, the methane emission factor of post - mining activities can be obtained. In this way, the methane emission factor can be accurately obtained through the desorption experiment to improve the quality of methane emission data in the coal industry.
[0041] It should be understood that the content described in the summary of the invention section is not intended to limit the key or important features of the embodiments of the present disclosure, nor is it used to limit the scope of the present disclosure. Other features of the present disclosure will become easily understood through the following description. [[ID=il3]] BRIEF DESCRIPTION OF THE DRAWINGS
[0042] In combination with the accompanying drawings and with reference to the following detailed description, the above - mentioned and other features, advantages, and aspects of the embodiments of the present disclosure will become more apparent. The drawings are used to better understand the solution and do not constitute a limitation to the present disclosure. In the drawings, the same or similar reference numerals represent the same or similar elements, where:
[0043] Figure 1 Shows a schematic diagram of methane escape emissions in the related art;
[0044] Figure 2 Shows a flowchart of a method for obtaining a methane emission factor according to an embodiment of the present disclosure;
[0045] Figure 3 Shows a comparison schematic diagram of isothermal desorption curves of different target coal samples according to an embodiment of the present disclosure;
[0046] Figure 4 Shows a block diagram of a device for obtaining a methane emission factor according to an embodiment of the present disclosure;
[0047] Figure 5 Shows a block diagram of an exemplary electronic device capable of implementing the embodiments of the present disclosure. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0048] To make the objectives, technical solutions, and advantages of the embodiments of the present disclosure clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present disclosure with reference to the accompanying drawings in the embodiments of the present disclosure. Obviously, the described embodiments are a part rather than all of the embodiments of the present disclosure. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present disclosure without creative efforts shall fall within the scope of protection of the present disclosure.
[0049] In addition, the term "and / or" in this article merely describes the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after.
[0050] Figure 2 The flowchart of the method 200 for obtaining the methane emission factor according to the embodiments of the present disclosure is shown.
[0051] The method 200 may include:
[0052] Step 210: Sampling at a preset sampling point of the mined coal to obtain a target coal sample;
[0053] The mined coal is the coal mined from the mine;
[0054] The preset sampling point may be a position relatively close to the mine exit, such as the belt at the mine exit or the storage bin in the coal preparation plant.
[0055] After coal sampling at the preset sampling point, the sampled coal is used as the target coal sample, and the mass of the target coal sample may be 8 kg, 10 kg, or 15 kg.
[0056] Step 220: Place the target coal sample in a sealed tank;
[0057] Step 230: Conduct a desorption experiment on the target coal sample in the sealed tank to obtain the isothermal desorption curve of the target coal sample;
[0058] The longer the experimental duration of the desorption experiment, the better. Preferably, the experimental duration is 3 hours.
[0059] During the desorption experiment, the temperature in the sealed tank remains unchanged. When connecting the sealed tank to the coal sample desorption experiment system for the desorption experiment, the gas desorption amount and methane concentration at each preset sampling time period can be measured. Among them, the gas desorption amount refers to the total amount of gas adsorbed on the coal in the sealed tank that becomes free gas, and this gas includes various gases such as methane, carbon monoxide, carbon dioxide, and nitrogen.
[0060] Methane desorption amount = gas desorption amount * methane concentration.
[0061] The isothermal desorption curve is used to characterize the methane desorption amount in each preset sampling time period, and the isothermal desorption curve is discrete.
[0062] Step 240: Fit the isothermal desorption curve to obtain an isothermal desorption equation, where the isothermal desorption equation is an equation regarding the relationship between time and methane desorption amount and is a continuous relationship;
[0063] Step 250: Use the isothermal desorption equation to obtain the methane emission factor of the post-mining activities.
[0064] By conducting a desorption experiment on the target coal sample in the sealed tank, the isothermal desorption curve of the target coal sample can be obtained. Then, by fitting the isothermal desorption curve, an isothermal desorption equation can be obtained. Furthermore, by using the isothermal desorption equation, the methane emission factor of the post-mining activities can be obtained. In this way, the methane emission factor can be accurately obtained through the desorption experiment to improve the quality of methane emission data in the coal industry.
[0065] In some embodiments, the conducting a desorption experiment on the target coal sample in the sealed tank to obtain the isothermal desorption curve of the target coal sample includes:
[0066] During the desorption experiment on the target coal sample in the sealed tank, the gas desorption amount and methane concentration of the sealed tank are collected every preset sampling time period;
[0067] Multiply the gas desorption amount and methane concentration collected in each preset sampling time period to obtain the methane desorption amount corresponding to each preset sampling time period;
[0068] Generate the isothermal desorption curve of the target coal sample according to the methane desorption amount corresponding to each preset sampling time period.
[0069] When conducting a desorption experiment on the target coal sample in the sealed tank, the gas desorption amount and methane concentration of the sealed tank can be collected every preset sampling time period. Then, multiply the gas desorption amount and methane concentration collected in each preset sampling time period to obtain the methane desorption amount corresponding to each preset sampling time period. Then, according to the methane desorption amount corresponding to each preset sampling time period, the isothermal desorption curve of the target coal sample can be automatically generated.
[0070] In some embodiments, the method further includes:
[0071] Taking the time when the mined coal is transported to the coal preparation plant as the starting point of time, obtain the duration of the coal washing and processing stage and the duration of the transportation stage of the mined coal;
[0072] Determine the time nodes of each stage. Taking the time when the coal sample leaves the mine or the time when the mined coal is transported to the coal preparation plant as the starting point of time, after the coal preparation process is completed, the time for loading the coal sample is t1, and the transportation time by train / truck / ship is t2. Therefore, the duration of the coal preparation stage is t1, and the duration of the transportation stage is t2.
[0073] The obtaining of the methane emission factor of the post - mine activity by using the isothermal desorption equation includes:
[0074] Substitute the duration of the coal preparation stage and the duration of the transportation stage into the isothermal desorption equation to obtain the methane emission factor of the post - mine activity.
[0075] By substituting the duration of the coal preparation stage and the duration of the transportation stage into the isothermal desorption equation, the methane emission factor of the post - mine activity can be accurately obtained.
[0076] In some embodiments, the substituting the duration of the coal preparation stage and the duration of the transportation stage into the isothermal desorption equation to obtain the methane emission factor of the post - mine activity includes:
[0077] Substitute the duration of the coal preparation stage into the isothermal desorption equation to obtain the first emission factor of the coal preparation stage;
[0078] Use the duration of the coal preparation stage, the duration of the transportation stage, and the isothermal desorption equation to obtain the second emission factor of the transportation stage;
[0079] Add the first emission factor and the second emission factor to obtain the methane emission factor of the post - mine activity.
[0080] By substituting the duration of the coal preparation stage into the isothermal desorption equation, the first emission factor of the coal preparation stage can be calculated. Similarly, using the duration of the coal preparation stage, the duration of the transportation stage, and the isothermal desorption equation, the second emission factor of the transportation stage can also be obtained. Then, add the first emission factor and the second emission factor to obtain the methane emission factor of the post - mine activity, that is, the methane emission factor A of the post - mine activity 矿后活动 = the first emission factor A of the coal preparation stage 洗选 + the second emission factor A of the transportation stage 运输 .
[0081] In some embodiments, the substituting the duration of the coal preparation stage into the isothermal desorption equation to obtain the first emission factor of the coal preparation stage includes:
[0082] Substitute the duration of the coal preparation stage into the isothermal desorption equation to obtain the methane desorption amount of the coal preparation stage;
[0083] Divide the methane desorption amount in the coal preparation and processing stage by the mass of the target coal sample to obtain the first emission factor.
[0084] Since the isothermal desorption equation is an equation regarding time and methane desorption amount, therefore, substituting the duration of the coal preparation and processing stage into the isothermal desorption equation can obtain the methane desorption amount in the coal preparation and processing stage. Then, dividing the methane desorption amount in the coal preparation and processing stage by the mass of the target coal sample can accurately obtain the first emission factor. For example: the methane desorption amount Q(t1) in the coal preparation and processing stage, and the corresponding first emission factor A is obtained through conversion 洗选 , and the calculation formula is: A 洗选 = Q(t1) / m, where m is the mass of the target coal sample.
[0085] In some embodiments, the method of using the duration of the coal preparation and processing stage, the duration of the transportation stage, and the isothermal desorption equation to obtain the second emission factor in the transportation stage includes:
[0086] Substitute the sum of the duration of the coal preparation and processing stage and the duration of the transportation stage into the isothermal desorption equation to obtain the sum of the methane desorption amounts in the coal preparation and processing stage and the transportation stage (i.e., Q(t1 + t2));
[0087] Substitute the duration of the coal preparation and processing stage into the isothermal desorption equation to obtain the methane desorption amount in the coal preparation and processing stage (i.e., Q(t1));
[0088] Subtract the methane desorption amount in the coal preparation and processing stage from the sum of the methane desorption amounts to obtain the methane desorption amount in the transportation stage (i.e., Q(t1 + t2) - Q(t1));
[0089] Divide the methane desorption amount in the transportation stage by the mass of the target coal sample to obtain the second emission factor. The second emission factor A 运输 = (Q(t1 + t2) - Q(t1)) / m, where the mass of the target coal sample is m, and the methane desorption amount in the transportation stage is Q(t1 + t2) - Q(t1).
[0090] Since the isothermal desorption equation is an equation regarding time and methane desorption amount, therefore, substituting the sum of the duration of the coal preparation and processing stage and the duration of the transportation stage into the isothermal desorption equation can obtain the sum of the methane desorption amounts in the coal preparation and processing stage and the transportation stage. Similarly, substituting the duration of the coal preparation and processing stage into the isothermal desorption equation can also obtain the methane desorption amount in the coal preparation and processing stage. Further, subtracting the methane desorption amount in the coal preparation and processing stage from the sum of the methane desorption amounts can accurately obtain the methane desorption amount in the transportation stage. Then, dividing the methane desorption amount in the transportation stage by the mass of the target coal sample can accurately obtain the second emission factor.
[0091] In some embodiments, the coal output of the mined coal within a preset time period is obtained;
[0092] The methane emission factor of the post-mining activity is multiplied by the coal output to obtain the methane emission amount of the mined coal within the preset time period.
[0093] By obtaining the coal output of the mined coal within a preset time period and then multiplying the methane emission factor of the post-mining activity by the coal output, the methane emission amount of the mined coal within the preset time period can be accurately obtained.
[0094] Next, the technical solution of the present disclosure will be further described in conjunction with Figure 3 The technical solution of the present disclosure will be further described:
[0095] Step 1: Determine the time nodes of each stage. Taking the time when the coal sample exits the mine as the starting point of time, after the coal sample is washed and processed, the time when the coal sample is loaded onto the vehicle is t1, and the transportation time by train / truck / ship is t2. Therefore, the duration of the washing and processing stage is t1, and the duration of the transportation stage is t2.
[0096] Step 2: Determine the sampling points, conduct sampling, and at the same time mark the mass m of the target coal sample and place it in a sealed tank.
[0097] Step 3: Conduct a desorption experiment on the target coal sample in the sealed tank within 5 minutes, record the gas desorption amount and methane concentration, the experimental time is not less than 2 hours, and obtain the isothermal desorption curve of the target coal sample.
[0098] Figure 3 The isothermal desorption curves of different coal samples are shown. By fitting the isothermal desorption curves of different coal samples, the corresponding isothermal desorption equation in Table 1 can be obtained, and the cumulative desorption amount (mL / g) or (mL / kg) of different coal samples at different time periods can be calculated, and further the emission factor (m 3 / t) of different coal samples within a certain period can be obtained.
[0099] Table 1 Equation for the change of methane desorption amount of different coal samples with time (Ln is the natural logarithm)
[0100]
[0101] Step 4: Fit the isothermal desorption curve to obtain the isothermal desorption equation Q(t), calculate the methane desorption amount Q(t1) in the washing and processing stage, and convert it to obtain the corresponding first emission factor A 洗选 , and the calculation formula is: A 洗选 = Q(t1) / m; calculate the methane desorption amount Q(t1 + t2) - Q(t1) in the transportation stage, and convert it to obtain the corresponding second emission factor A 运输 , and the calculation formula is: A 运输=(Q(t1 + t2)-Q(t1)) / m;
[0102] Step Five: Methane emission factor A for post - mining activities 矿后活动 = A 洗选 + A 运输 ;
[0103] Example 1: Take an open - pit long - flame coal mine as an example.
[0104] Step One: Starting from the time when raw coal is mined and transferred to the coal preparation plant, after coal preparation and processing, the time for loading the commercial coal sample is 120 min, and the transportation time on the train is 960 min until it reaches the destination. Therefore, the duration of the coal preparation and processing stage is 120 min, and the duration of the transportation stage is 960 min.
[0105] Step Two: Determine the sampling point when the raw coal arrives at the coal preparation plant silo, take a sample, mark the mass as 10 kg, and put it into a sealed tank.
[0106] Step Three: Quickly connect the sealed tank to the coal sample desorption experiment system within less than 3 min after sampling. Record a data point (gas desorption volume and methane concentration) every 3 min to obtain the isothermal desorption curve of the coal sample, and the experimental time is not less than 20 hours.
[0107] Step Four: Fit the isothermal desorption curve to obtain the isothermal desorption equation Q(t)=0.2154Ln(t)+0.4439. Calculate the methane desorption volume Q(120)=0.2154Ln(120)+0.4439 = 1.4751 L during the coal preparation and processing stage, and convert it to the corresponding emission factor A 洗选 = 1.4751 L / 10 kg = 0.1475 m 3 / t; Calculate the methane desorption volume Q(120 + 960)-Q(120)=0.2154Ln(120 + 960)+0.4439 - 0.2154Ln(120)-0.4439 = 0.4733 L during the transportation stage, and convert it to the corresponding emission factor A 运输 = 0.4733 L / 10 kg = 0.04733 m 3 / t;
[0108] Step Five: Post - mining activity emission factor A 矿后活动 = A 洗选 + A 运输 = 0.1475 + 0.04733 = 0.19483 m3 / t.
[0109] Example 2: Take an underground anthracite coal mine as an example
[0110] Step 1: Starting from the time when anthracite raw coal exits the mine shaft, it undergoes washing and processing in sequence. The time from the start of washing and processing to the loading of the commercial coal sample onto the train is 100 minutes, and the transportation time on the train is 770 minutes until it reaches the destination. Therefore, the duration of the washing and processing stage is 100 minutes, and the duration of the transportation stage is 770 minutes.
[0111] Step 2: Determine the sampling point at the long-flame coal outlet belt of the mine shaft, take a sample, mark the mass as 8 kg, and place it in a sealed tank.
[0112] Step 3: Quickly connect the sealed tank to the coal sample desorption experiment system within less than 3 minutes after sampling completion. Record a data point (gas desorption volume and methane concentration) every 3 minutes to obtain the isothermal desorption curve of the coal sample. The experimental time is not less than 20 hours.
[0113] Step 4: Fit the isothermal desorption curve to obtain the isothermal desorption equation Q(t) = 1.1316Ln(t) + 0.8279. Calculate the methane desorption volume Q(100) = 1.1316ln(100) + 0.8279 = 6.0391 L during the washing and processing stage, and convert it to the corresponding emission factor A 洗选 = 6.0391 L / 8 kg = 0.7549 m 3 / t; Calculate the methane desorption volume during the transportation stage Q(100 + 770) - Q(100) = 1.1316Ln(100 + 770) + 0.8279 - 1.1316Ln(100) - 0.8279 = 2.4480 L, and convert it to the corresponding emission factor A 运输 = 2.4480 L / 8 kg = 0.3060 m 3 / t;
[0114] Step 5: The emission factor A of post-mining activities 矿后活动 = A 洗选 + A 运输 = 0.7549 + 0.3060 = 1.0609 m 3 / t.
[0115] It should be noted that for the foregoing method embodiments, for the sake of simple description, they are all expressed as a series of action combinations. However, those skilled in the art should know that the present disclosure is not limited by the described action sequence, because according to the present disclosure, certain steps can be performed in other sequences or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all optional embodiments, and the actions and modules involved are not necessarily essential to the present disclosure.
[0116] The above is the introduction of the method embodiments. The following further illustrates the solution of the present disclosure through device embodiments.
[0117] Figure 4 The block diagram of the methane emission factor acquisition device 400 according to an embodiment of the present disclosure is shown. As Figure 4 shown, the device 400 includes:
[0118] A sampling module 410, configured to sample at a preset sampling point of the mined coal to obtain a target coal sample;
[0119] A placement module 420, configured to place the target coal sample in a sealed tank;
[0120] A desorption experiment module 430, configured to perform a desorption experiment on the target coal sample in the sealed tank to obtain the isothermal desorption curve of the target coal sample;
[0121] A fitting module 440, configured to fit the isothermal desorption curve to obtain an isothermal desorption equation, where the isothermal desorption equation is a relationship between time and methane desorption amount;
[0122] A processing module 450, configured to use the isothermal desorption equation to obtain the methane emission factor of the post-mining activities.
[0123] Those skilled in the art can clearly understand that for the convenience and conciseness of description, the specific working processes of the described modules can refer to the corresponding processes in the foregoing method embodiments, and will not be elaborated herein.
[0124] According to an embodiment of the present disclosure, the present disclosure also provides an electronic device and a non-transitory computer-readable storage medium storing computer instructions.
[0125] Figure 5 The schematic block diagram of the electronic device 800 that can be used to implement the embodiments of the present disclosure is shown. The electronic device is intended to represent various forms of digital computers, such as, laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as, personal digital processing, cellular phones, smart phones, wearable devices, and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present disclosure described and / or claimed herein.
[0126] Device 800 includes a computing unit 801 which can perform various appropriate actions and processes according to a computer program stored in a read-only memory (ROM) 802 or a computer program loaded from a storage unit 808 into a random access memory (RAM) 803. In the RAM 803, various programs and data required for the operation of the device 800 can also be stored. The computing unit 801, the ROM 802, and the RAM 803 are connected to each other via a bus 804. An input / output (I / O) interface 805 is also connected to the bus 804.
[0127] Multiple components in the device 800 are connected to the I / O interface 805, including: an input unit 806, such as a keyboard, a mouse, etc.; an output unit 807, such as various types of displays, speakers, etc.; a storage unit 808, such as a magnetic disk, an optical disc, etc.; and a communication unit 809, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 809 allows the device 800 to exchange information / data with other devices via a computer network such as the Internet and / or various telecommunication networks.
[0128] The computing unit 801 can be various general-purpose and / or special-purpose processing components with processing and computing capabilities. Some examples of the computing unit 801 include but are not limited to a central processing unit (CPU), a graphics processing unit (GPU), various dedicated artificial intelligence (AI) computing chips, various computing units running machine learning model algorithms, a digital signal processor (DSP), and any appropriate processor, controller, microcontroller, etc. The computing unit 801 executes the various methods and processes described above, such as method 200. For example, in some embodiments, method 200 can be implemented as a computer software program which is tangibly contained in a machine-readable medium, such as the storage unit 808. In some embodiments, part or all of the computer program can be loaded and / or installed onto the device 800 via the ROM 802 and / or the communication unit 809. When the computer program is loaded into the RAM 803 and executed by the computing unit 801, one or more steps of the method 200 described above can be executed. Alternatively, in other embodiments, the computing unit 801 can be configured to execute method 200 in any other appropriate way (e.g., by means of firmware).
[0129] The various embodiments of the systems and techniques described above in this document can be implemented in digital electronic circuitry, integrated circuit systems, field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), systems-on-chip (SOCs), complex programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments can include: being implemented in one or more computer programs that are executable and / or interpretable on a programmable system including at least one programmable processor, which can be a special-purpose or general-purpose programmable processor that receives data and instructions from a storage system, at least one input device, and at least one output device, and transmits the data and instructions to the storage system, the at least one input device, and the at least one output device.
[0130] The program code for implementing the methods of the present disclosure can be written in any combination of one or more programming languages. These program codes can be provided to a processor or controller of a general-purpose computer, a special-purpose computer, or other programmable data processing device, such that when the program codes are executed by the processor or controller, the functions / operations specified in the flowcharts and / or block diagrams are implemented. The program code can be executed entirely on the machine, partially on the machine, as an independent software package partially on the machine and partially on a remote machine, or entirely on a remote machine or server.
[0131] In the context of the present disclosure, a machine-readable medium can be a tangible medium that can contain or store a program for use by or in connection with an instruction execution system, apparatus, or device. A machine-readable medium can be a machine-readable signal medium or a machine-readable storage medium. A machine-readable medium can include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination of the foregoing. More specific examples of a machine-readable storage medium would include electrical connections based on one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fibers, compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the foregoing.
[0132] To provide interaction with a user, the systems and techniques described herein can be implemented on a computer having: a display device for displaying information to the user (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor); and a keyboard and a pointing device (e.g., a mouse or a trackball) through which the user can provide input to the computer. Other kinds of devices can also be used to provide interaction with the user; for example, the feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including acoustic input, speech input, or tactile input).
[0133] The systems and techniques described herein can be implemented in a computing system including backend components (e.g., as a data server), or a computing system including middleware components (e.g., an application server), or a computing system including frontend components (e.g., a user computer having a graphical user interface or a web browser through which the user can interact with an implementation of the systems and techniques described herein), or a computing system including any combination of such backend components, middleware components, or frontend components. The components of the system can be interconnected to each other by digital data communication in any form or medium (e.g., a communication network). Examples of communication networks include: local area network (LAN), wide area network (WAN), and the Internet.
[0134] A computing system can include a client and a server. The client and the server are generally remote from each other and typically interact through a communication network. The client-server relationship is created by computer programs running on the respective computers and having a client-server relationship with each other. The server can be a cloud server, or a server of a distributed system, or a server incorporating a blockchain.
[0135] It should be understood that various forms of the processes shown above can be used, with steps reordered, added, or deleted. For example, the steps recited in this disclosure can be executed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution disclosed in this disclosure can be achieved, and no limitation is imposed herein.
[0136] The above specific embodiments do not constitute a limitation on the protection scope of this disclosure. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principle of this disclosure shall be included within the protection scope of this disclosure.
Claims
1. A method for obtaining methane emission factors, characterized in that Including: Sampling at a preset sampling point of the mined coal to obtain a target coal sample; Placing the target coal sample in a sealed tank; Conducting a desorption experiment on the target coal sample in the sealed tank to obtain the isothermal desorption curve of the target coal sample; Fitting the isothermal desorption curve to obtain an isothermal desorption equation, where the isothermal desorption equation is an equation regarding time and methane desorption amount; Using the isothermal desorption equation to obtain the methane emission factor of the post-mining activities.
2. The method according to claim 1, wherein The conducting a desorption experiment on the target coal sample in the sealed tank to obtain the isothermal desorption curve of the target coal sample includes: During the desorption experiment on the target coal sample in the sealed tank, collecting the gas desorption amount and methane concentration of the sealed tank at each preset sampling time period; Multiplying the gas desorption amount and methane concentration collected at each preset sampling time period to obtain the methane desorption amount corresponding to each preset sampling time period; Generating the isothermal desorption curve of the target coal sample according to the methane desorption amount corresponding to each preset sampling time period.
3. The method according to claim 1, wherein The method further includes: Taking the time when the mined coal is transported to the coal preparation plant as the starting time, and obtaining the duration of the coal washing and processing stage and the duration of the transportation stage of the mined coal; The using the isothermal desorption equation to obtain the methane emission factor of the post-mining activities includes: Substituting the duration of the coal washing and processing stage and the duration of the transportation stage into the isothermal desorption equation to obtain the methane emission factor of the post-mining activities.
4. The method according to claim 3, wherein The substituting the duration of the coal washing and processing stage and the duration of the transportation stage into the isothermal desorption equation to obtain the methane emission factor of the post-mining activities includes: Substituting the duration of the coal washing and processing stage into the isothermal desorption equation to obtain the first emission factor of the coal washing and processing stage; Using the duration of the coal washing and processing stage, the duration of the transportation stage, and the isothermal desorption equation to obtain the second emission factor of the transportation stage; Adding the first emission factor and the second emission factor to obtain the methane emission factor of the post-mining activities.
5. The method according to claim 4, wherein The substituting the duration of the coal washing and processing stage into the isothermal desorption equation to obtain the first emission factor of the coal washing and processing stage includes: Substituting the duration of the coal washing and processing stage into the isothermal desorption equation to obtain the methane desorption amount of the coal washing and processing stage; Dividing the methane desorption amount of the coal washing and processing stage by the mass of the target coal sample to obtain the first emission factor.
6. The method according to claim 4, wherein The using the duration of the coal washing and processing stage, the duration of the transportation stage, and the isothermal desorption equation to obtain the second emission factor of the transportation stage includes: Substituting the sum of the duration between the coal washing and processing stage and the transportation stage into the isothermal desorption equation to obtain the sum of the methane desorption amounts of the coal washing and processing stage and the transportation stage; Substituting the duration of the coal washing and processing stage into the isothermal desorption equation to obtain the methane desorption amount of the coal washing and processing stage; Subtract the sum of the methane desorption amounts from the methane desorption amount in the coal preparation processing stage to obtain the methane desorption amount in the transportation stage; Divide the methane desorption amount in the transportation stage by the mass of the target coal sample to obtain the second emission factor.
7. The method according to any one of claims 1 to 6, characterized in that Obtain the coal output of the mined coal within a preset time period; Multiply the methane emission factor of the post-mining activities by the coal output to obtain the methane emission amount of the mined coal within the preset time period.
8. An apparatus for obtaining a methane emission factor, characterized in that, Comprising: A sampling module for sampling at a preset sampling point of the mined coal to obtain a target coal sample; A placement module for placing the target coal sample in a sealed tank; A desorption experiment module for performing a desorption experiment on the target coal sample in the sealed tank to obtain the isothermal desorption curve of the target coal sample; A fitting module for fitting the isothermal desorption curve to obtain an isothermal desorption equation, wherein the isothermal desorption equation is an equation regarding the relationship between time and methane desorption amount; A processing module for using the isothermal desorption equation to obtain the methane emission factor of the post-mining activities.
9. An electronic device, characterized in that, Comprising: At least one processor; And A memory communicatively connected to the at least one processor; wherein The memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to execute the method according to any one of claims 1-7.
10. A non-transitory computer-readable storage medium storing computer instructions, characterized in that, The computer instructions are used to cause the computer to execute the method according to any one of claims 1-7.