Coal underground mining carbon emission calculation method, device, equipment, medium and product

Abstract

The invention discloses a coal underground mining carbon emission calculation method and device, equipment, a medium and a product, and relates to the field of carbon emission.The method comprises the steps that the original gas content, the residual gas content and the residual gas content of a target coal seam are obtained through a sensor; under the conditions that the coal pillars are reserved and the coal pillars are not reserved, the methane emission total volume is obtained according to the original gas content, the residual gas content and the residual gas content of the target coal seam, and under the conditions that the coal pillars are reserved and the coal pillars are not reserved are obtained according to the methane emission mode and the methane emission total volume; the carbon emission intensity under different methane emission modes can be improved, and the precision of the carbon emission result can be improved.

Description

Technical Field

[0001] The present application relates to the field of carbon emissions, and in particular to a method, device, equipment, medium and product for calculating carbon emissions from underground coal mining. Background Art

[0002] The current "Guidelines for Calculating and Reporting Greenhouse Gas Emissions for Enterprises" still have vague areas in defining the emission boundaries of specific mines. Its methane emission calculations are based only on a unified emission factor based on the type of coal mine ownership (state-owned, local and township coal mines). It neither considers the gas extraction and utilization situation nor distinguishes the specific emission links. As a result, the accuracy of the carbon emission calculation results is limited, resulting in insignificant governance effects after the subsequent emission reduction strategy is formulated based on this calculation result and the governance is carried out according to this emission reduction strategy. Summary of the Invention

[0003] The purpose of this application is to provide a method, device, equipment, medium and product for calculating carbon emissions from underground coal mining, which can improve the accuracy of carbon emission results.

[0004] To achieve the above objectives, the present application provides the following solutions: First, the present application provides a method for calculating carbon emissions from underground coal mining, including: obtaining the original gas content, residual gas content and remaining gas content of the target coal seam through sensors.

[0005] If a coal pillar is left during the mining process of the target coal seam, the methane emission volume when the coal pillar is left is obtained based on the original gas content, residual gas content and remaining gas content of the target coal seam; the methane emission volume when the coal pillar is left includes: the methane emission volume of the coal pillar extraction link, the methane emission volume of the coal output extraction link and the methane emission volume of the coal output ventilation link.

[0006] Based on the methane emission volume when the coal pillar is left, the total volume of methane emission during the coal mining process when the coal pillar is left is obtained.

[0007] Based on the total volume of methane emissions during coal mining with a coal pillar left and the methane emission pattern during mining in the target coal seam, the carbon emission intensity with a coal pillar left was obtained.

[0008] If no coal pillar is left during the mining process of the target coal seam, the methane emission volume without leaving a coal pillar is obtained based on the original gas content, residual gas content and remaining gas content of the target coal seam; the methane emission volume without leaving a coal pillar includes the methane emission volume of the extraction link and the methane emission volume of the ventilation link when no coal pillar is left.

[0009] Based on the methane emission volume without leaving coal pillars, the total volume of methane emissions during coal mining without leaving coal pillars was obtained.

[0010] Based on the total volume of methane emissions during coal mining without leaving coal pillars and the methane emission pattern during coal mining in the target coal seam, the carbon emission intensity without leaving coal pillars was obtained.

[0011] In a second aspect, the present application provides a device for calculating carbon emissions from underground coal mining, comprising: a data acquisition module for acquiring the original gas content, residual gas content, and remaining gas content of a target coal seam through a sensor.

[0012] The volume determination module for the case of leaving a coal pillar is used to obtain the methane emission volume for the case of leaving a coal pillar based on the original gas content, residual gas content and remaining gas content of the target coal seam if a coal pillar is left during the mining process of the target coal seam; the methane emission volume for the case of leaving a coal pillar includes: the methane emission volume of the coal pillar extraction link, the methane emission volume of the coal output extraction link and the methane emission volume of the coal output ventilation link.

[0013] The total volume determination module under the condition of leaving a coal pillar is used to obtain the total volume of methane emissions during the coal mining process under the condition of leaving a coal pillar based on the methane emission volume under the condition of leaving a coal pillar.

[0014] The module for determining the carbon emission intensity under the condition of leaving a coal pillar is used to obtain the carbon emission intensity under the condition of leaving a coal pillar based on the total volume of methane emissions during the coal mining process under the condition of leaving a coal pillar and the methane emission pattern during the mining process of the target coal seam.

[0015] The volume determination module for the case where no coal pillar is left is used to obtain the methane emission volume without leaving a coal pillar based on the original gas content, residual gas content and remaining gas content of the target coal seam if no coal pillar is left during the coal mining process of the target coal seam; the methane emission volume without leaving a coal pillar includes the methane emission volume of the extraction link and the methane emission volume of the ventilation link when no coal pillar is left.

[0016] The total volume determination module under the condition of no coal pillar is used to obtain the total volume of methane emissions in the coal mining process under the condition of no coal pillar based on the methane emission volume under the condition of no coal pillar.

[0017] The module for determining the carbon emission intensity without leaving coal pillars is used to obtain the carbon emission intensity without leaving coal pillars based on the total volume of methane emissions during the coal mining process without leaving coal pillars and the methane emission pattern during the mining process of the target coal seam.

[0018] In a third aspect, the present application provides a computer device comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the above-mentioned method for calculating carbon emissions from underground coal mining.

[0019] In a fourth aspect, the present application provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the above-mentioned method for calculating carbon emissions from underground coal mining.

[0020] In a fifth aspect, the present application provides a computer program product, comprising a computer program, which, when executed by a processor, implements the above-mentioned method for calculating carbon emissions from underground coal mining.

[0021] According to the specific embodiments provided in this application, this application has the following technical effects: This application provides a method, device, equipment, medium and product for calculating carbon emissions from underground coal mining, which takes into account whether a coal pillar is left during the coal mining process, and on this basis obtains the methane emission volume of the extraction link and the ventilation link based on the original gas content, residual gas content and residual gas content, and then obtains the methane emission volume when a coal pillar is left and the methane emission volume when no coal pillar is left, and obtains the carbon emission intensity based on the methane emission volume when a coal pillar is left or the methane emission volume when no coal pillar is left and the methane emission method, thereby improving the accuracy of the carbon emission results. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 Schematic diagram of coal seam.

[0024] Figure 2 This is a schematic diagram of the scope of this coal seam.

[0025] Figure 3 A flow chart of a method for calculating carbon emissions from underground coal mining provided in another embodiment of the present application.

[0026] Figure 4 A schematic diagram of the structure of a computer device provided in one embodiment of the present application. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0028] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0029] Methane emissions are divided into three main links: treatment and extraction link, wind exhaust link and escape link. The amount of methane escape in the escape link is small and decreases over time, so it is not considered in the overall process. Based on this, in an exemplary embodiment, Figure 3 As shown, a method for calculating carbon emissions from underground coal mining is provided, comprising the following steps.

[0030] Step 201: Obtain the original gas content, residual gas content and remaining gas content of the target coal seam through sensors.

[0031] Step 202: If a coal pillar is left during the mining process of the target coal seam, the methane emission volume when the coal pillar is left is obtained based on the original gas content, residual gas content and remaining gas content of the target coal seam; the methane emission volume when the coal pillar is left includes: the methane emission volume of the coal pillar extraction link, the methane emission volume of the coal output extraction link and the methane emission volume of the coal output ventilation link.

[0032] Step 203: Based on the methane emission volume in the case of leaving a coal pillar, the total volume of methane emission during the coal mining process in the case of leaving a coal pillar is obtained.

[0033] Step 204: Based on the total volume of methane emissions during the coal mining process with the coal pillar left, and the methane emission pattern during the coal mining process of the target coal seam, the carbon emission intensity with the coal pillar left is obtained.

[0034] Step 205: If no coal pillar is left during the mining process of the target coal seam, the methane emission volume without leaving a coal pillar is obtained based on the original gas content, residual gas content and remaining gas content of the target coal seam; the methane emission volume without leaving a coal pillar includes the methane emission volume of the extraction link and the methane emission volume of the ventilation link when no coal pillar is left.

[0035] Step 206: Based on the methane emission volume when no coal pillar is left, the total volume of methane emission during the coal mining process when no coal pillar is left is obtained.

[0036] Step 207: Based on the total volume of methane emissions during the coal mining process without leaving coal pillars and the methane emission pattern during the coal mining process of the target coal seam, the carbon emission intensity without leaving coal pillars is obtained.

[0037] In practical applications, before step 202, the process further includes: determining a calculation range according to the strike length, dip length and thickness of the target coal seam.

[0038] The volume of methane emissions in the extraction stage is calculated by subtracting the residual gas content from the original gas content, and then multiplying it by the amount of coal that has undergone the extraction stage; the volume of methane emissions in the exhaust stage is calculated by subtracting the residual gas content from the residual gas content, and then multiplying it by the amount of coal that has undergone the exhaust stage. Therefore, in actual applications, step 202 specifically includes: based on the original gas content, residual gas content and quality of the coal produced in the target coal seam, obtaining the methane emission volume in the coal extraction stage when a coal pillar is left.

[0039] Based on the residual gas content, remaining gas content and coal quality of the target coal seam, the methane emission volume of the coal output air exhaust link is obtained when the coal pillar is retained.

[0040] Based on the original gas content, residual gas content and the mass of the coal in the coal pillar of the target coal seam, the methane emission volume of the coal pillar extraction link is obtained when the coal pillar is retained.

[0041] In actual application, step 203 is specifically as follows: when a coal pillar is left, the methane emission volume of the coal output is composed of two links: extraction and ventilation. Therefore, the sum of the methane emission volume of the coal extraction link and the methane emission volume of the coal ventilation link is calculated to obtain the methane emission volume of the coal output when a coal pillar is left.

[0042] The methane emission volume of the coal pillar left behind only considers the extraction link, so the methane emission volume of the coal pillar left behind in the extraction link is determined as the methane emission volume of the coal pillar left behind when the coal pillar is left behind.

[0043] The total volume of methane emissions during coal mining with a coal pillar is obtained by adding the volume of methane emissions from coal output with a coal pillar and the volume of methane emissions from coal pillars with a coal pillar.

[0044] In practical applications, step 204 specifically includes: if the methane emission method during the target coal seam mining process is direct emission into the atmosphere, then based on the total volume of methane emissions during the coal mining process with a coal pillar left, the carbon emission intensity with a coal pillar left is obtained.

[0045] If the methane emission method during the mining process of the target coal seam is combustion utilization, the carbon emission intensity under the condition of leaving a coal pillar is obtained based on the combustion efficiency of methane combustion to generate carbon dioxide and the total volume of methane emissions during the mining process under the condition of leaving a coal pillar.

[0046] When directly discharged into the atmosphere, the methane emission volumes in the extraction and exhaust stages are converted into carbon dioxide equivalents respectively. Therefore, in practical applications, the carbon emission intensity under the condition of leaving a coal pillar is obtained based on the total volume of methane emissions during the coal mining process. Specifically, the mass of methane emitted under the condition of leaving a coal pillar is obtained based on the total volume of methane emissions during the coal mining process.

[0047] Based on the mass of methane emitted when the coal pillar is left, the carbon dioxide equivalent of carbon emissions when the coal pillar is left is obtained.

[0048] Based on the carbon dioxide equivalent of carbon emissions when the coal pillar is left, the carbon emission intensity when the coal pillar is left is obtained.

[0049] When using methane for combustion, it is assumed that all methane extracted is used for power generation, with a combustion efficiency of 95%. This combustion generates carbon dioxide, and its carbon emissions are calculated using the chemical reaction equation. Methane emitted from the exhaust air is still calculated as direct emissions. Therefore, in practice, the carbon emission intensity for the "coal pillar" scenario is calculated based on the combustion efficiency of methane to generate carbon dioxide and the total volume of methane emitted during mining with a coal pillar. Specifically, the mass of methane emitted during mining with a coal pillar is calculated based on the total volume of methane emitted.

[0050] Based on the mass of methane emitted when the coal pillar is left and the combustion efficiency of methane to produce carbon dioxide, the carbon dioxide equivalent of carbon emissions when the coal pillar is left is obtained.

[0051] Based on the carbon dioxide equivalent of carbon emissions when the coal pillar is left, the carbon emission intensity when the coal pillar is left is obtained.

[0052] In practical applications, step 205 specifically includes: obtaining the methane emission volume of the extraction link without leaving a coal pillar based on the original gas content, residual gas content and quality of the mineable coal of the target coal seam.

[0053] Based on the residual gas content, residual gas content and quality of mineable coal in the target coal seam, the methane emission volume of the air exhaust link without leaving a coal pillar is obtained.

[0054] When no coal pillars are left, all the mineable coal can be transported out of the ground. The methane emission volume consists of two links: extraction and ventilation. Therefore, in practical applications, based on the methane emission volume when no coal pillars are left, the total methane emission volume in the coal mining process when no coal pillars are left is obtained. Specifically, the sum of the methane emission volume of the extraction link and the methane emission volume of the ventilation link is calculated to obtain the total methane emission volume in the coal mining process when no coal pillars are left.

[0055] In practical applications, step 207 specifically includes: if the methane emission method during the target coal seam mining process is direct emission into the atmosphere, then based on the total volume of methane emissions during the coal mining process without leaving a coal pillar, the carbon emission intensity without leaving a coal pillar is obtained.

[0056] If the methane emission method during the target coal seam mining process is combustion utilization, the carbon emission intensity without leaving a coal pillar is obtained based on the combustion efficiency in the process of methane combustion to generate carbon dioxide and the total volume of methane emissions during the coal mining process without leaving a coal pillar.

[0057] In practical applications, the carbon emission intensity without coal pillars is obtained based on the total volume of methane emissions during coal mining without leaving coal pillars. Specifically, the mass of methane emitted without coal pillars is obtained based on the total volume of methane emissions during coal mining without leaving coal pillars.

[0058] Based on the mass of methane emitted without leaving a coal pillar, the carbon dioxide equivalent of carbon emissions without leaving a coal pillar is obtained.

[0059] Based on the carbon dioxide equivalent of carbon emissions without leaving a coal pillar, the carbon emission intensity without leaving a coal pillar is obtained.

[0060] In practical applications, the carbon emission intensity without coal pillars is obtained based on the combustion efficiency of methane combustion to produce carbon dioxide and the total volume of methane emissions during coal mining without leaving coal pillars. Specifically, the mass of methane emitted without coal pillars is obtained based on the total volume of methane emissions during coal mining without leaving coal pillars.

[0061] Based on the mass of methane emitted without leaving a coal pillar and the combustion efficiency in the process of methane combustion to produce carbon dioxide, the carbon dioxide equivalent of carbon emissions without leaving a coal pillar is obtained.

[0062] Based on the carbon dioxide equivalent of carbon emissions without leaving a coal pillar, the carbon emission intensity without leaving a coal pillar is obtained.

[0063] This application also provides a more specific embodiment to introduce the above-mentioned method for calculating carbon emissions from underground coal mining, and the specific steps include steps one to four.

[0064] Step 1: Define the calculation scope.

[0065] Gas (CH4) prevention and control technologies generally include ventilation management, gas extraction technology and gas control, etc. These conventional technologies generally only affect a single coal seam, such as Figure 1As shown, gas control technologies, such as protective seam technology, can affect the emission of methane from adjacent coal seams. When mining a particular coal seam, adjacent coal seams are affected by mining. This mining activity can create cracks in the adjacent coal seams, causing methane to escape from the adjacent seams into the mined seam, increasing the methane content in the mined seam. However, the total methane volume (extraction volume + ventilation volume + residual volume) for the entire mine remains unchanged; the timing of methane emissions is simply advanced. While some methane from unmineable coal seams may escape into other mineable seams, this contribution is insignificant and is not considered here. Therefore, when calculating the volume of methane emissions from a particular working face in a mine, only methane emissions from that coal seam are considered.

[0066] To calculate the methane extraction volume of this coal seam, we should first determine its extraction range, i.e., the calculation range. When extracting gas from this coal seam, the surrounding coal seams or rock formations will be extracted. Based on the above theory, it is not necessary to consider the extraction range in the calculation. Figure 2 The methane emission that diffuses to the surrounding areas is calculated only for the coal body of the coal seam ( Figure 2 Assume that the target coal seam to be mined is a cube, such as Figure 2 As shown, the strike length is W, the dip length is L, the coal seam thickness is H, and the range of methane is the range for calculating the volume of the coal body of this coal seam.

[0067] Step 2: Divide the emission links based on the calculation scope in step 1.

[0068] This application divides the methane emission stage into the treatment and extraction stage, the wind exhaust stage and the dissipation stage. Some scholars have conducted a dissipation analysis on this part of methane and concluded that the amount of methane dissipated in this part is very small and decreases with the extension of exposure time, so it is not considered in the calculation of this application.

[0069] Because coal pillars are often left behind in engineering projects, this application divides the recoverable coal volume into the output and the remaining coal pillar. The output undergoes both extraction and ventilation, while the remaining coal pillar only undergoes extraction. Although the surface coal of the coal pillar undergoes desorption and release, this portion is not significant and is not considered here.

[0070] The residual gas content and the residual gas content can be measured by actual measurement or calculated according to formula (1) and formula (2).

[0071] Calculation formula for residual gas content: (1).

[0072] Calculation formula for residual gas (non-desorbable): (2).

[0073] Where: W CY is the residual gas content, m 3 / t ; W CC is the residual gas content, the amount of non-desorbable gas in coal at standard atmospheric pressure, m 3 / t ;P CY is the residual relative gas pressure of the coal seam, Mpa ; is standard atmospheric pressure, 0.101325 Mpa ; is the limit adsorption capacity of coal at the test temperature, m 3 / t ; b is the gas adsorption constant that depends on temperature and coal, MPa -1 ; A d is the ash content of coal, %; M ad is the moisture content of coal, %; π is the porosity of coal, % is the bulk density of coal, t / m 3 .

[0074] Step 3: Calculate the volume of methane emissions based on the emissions in step 2.

[0075] In the case of leaving coal pillars, it is a common protection method in coal mining to leave coal pillars during the mining process to protect the roadway from collapse, such as the 121 method. Generally, the coal pillars account for 7% to 15% of the circled reserves. For the convenience of calculation, this application takes a value near the average value. Assuming that the amount of coal left in the coal pillars is 10% of the mineable coal volume, the coal seam to be mined is as follows: Figure 2 As shown, the positions where coal pillars need to be left are left at both ends of the strike direction, and the coal pillars are left at a certain distance. The amount of coal left here is calculated as 10% of the minable coal amount. Then the amount of coal mined under this method is It is expressed as formula (3).

[0076] (3).

[0077] (4).

[0078] (5).

[0079] Where: It is the amount of coal that can be mined when a coal pillar is left. m 3 ; is the amount of coal left for the coal pillar,m 3 ; It refers to the volume of coal. m 3 .

[0080] Under this method, the recoverable coal volume can be divided into two parts: the first is the coal output part, which undergoes extraction and ventilation, so the methane emission volume of the extraction and ventilation stages must be considered in the calculation; the second is the coal pillar part, which only calculates the emission of the coal in the extraction stage. 3 / t or less. Combined with actual production, the residual gas content here is taken as 7.5m 3 / t. Here, the methane emission volume is divided into two sections for calculation.

[0081] ① Coal outlet part.

[0082] The methane emission volume of coal produced with a coal pillar is the methane extracted before mining and the methane released into the roadway or air during mining, in addition to the non-desorbable methane remaining in the coal. This includes the methane that escapes from the coal mass during extraction and ventilation. The calculation process is as follows.

[0083] (6).

[0084] (7).

[0085] (8).

[0086] (9).

[0087] Where: The methane emission volume of the coal output when the coal pillar is left ，m 3 ; For the quality of coal, t ; is the density of coal, kg / m 3 ; W is the original gas content, m 3 / t ; W CY is the residual gas content, take 7.5, m 3 / t ; W CC is the residual gas content, calculated according to formula (2), m 3 / t; is the volume of methane emissions from coal extraction, m 3 ; is the volume of methane emissions from the coal exhaust air exhaust link, m 3 .

[0088] ②Coal pillar part.

[0089] The coal pillars are left underground to protect the tunnels and are not transported to the surface. Therefore, when calculating the volume of methane emissions, only the amount of methane removed during extraction is considered. The calculation process is as follows.

[0090] (10).

[0091] (11).

[0092] Where: The methane emission volume of the coal pillar when the coal pillar is left is the methane emission volume of the coal pillar extraction link. m 3 ; is the mass of the coal in the coal pillar, t ; is the density of coal, kg / m 3 .

[0093] As mining technology matures, several pillar-free mining methods have emerged, such as the 110 / N00 method. These pillar-free, self-forming tunneling methods not only reduce stress concentration for safety but also improve coal resource recovery economically. Consequently, many coal mines utilize these pillar-free mining methods in practice. In a pillar-free scenario, it can be assumed that all recoverable coal has been removed from the surface. Methane emissions, with the exception of any remaining, non-desorbable methane in the coal mass, are removed from the coal mass during extraction and ventilation. Therefore, calculations are divided into two steps: extraction and ventilation. The calculation process is as follows.

[0094] (12).

[0095] (13).

[0096] (14).

[0097] Where: The amount of coal that can be mined without leaving a coal pillar ，m 3 ; The quality of the coal that can be mined without leaving a coal pillar. t; is the density of coal, kg / m 3 ; The volume of methane emissions without leaving a coal pillar is: m 3 ; W CC is the residual gas content, which can be calculated using formula (2): m 3 / t .

[0098] If no coal pillars are left, it can be generally assumed that all the coal seams in the planned area have been mined and transported to the ground. During this process, methane emissions go through both extraction and wind exhaust. Therefore, when calculating, the amount of gas emitted is calculated by subtracting the residual gas content from the original gas content. It represents the volume of methane emitted in the extraction part and the exhaust part. The methane emission volume of these two parts can be calculated according to the following method.

[0099] (15).

[0100] (16).

[0101] Where: To determine the quality of coal that can be mined without leaving any coal pillars, t ; The volume of methane emissions from extraction without leaving a coal pillar is: m 3 ; is the methane emission volume of the air exhaust link without leaving the coal pillar, m 3 .

[0102] Step 4: Calculate carbon emission intensity based on the methane emission volume in Step 3.

[0103] Carbon intensity broadly refers to the amount of carbon dioxide emitted per unit of GDP. Carbon intensity can be used to implement carbon reduction strategies for specific processes. In this application, it refers to the carbon dioxide equivalent emissions from producing one ton of coal.

[0104] In the early days, immature gas extraction technology led to poor extraction results, insufficient methane concentrations, and a lack of efficient utilization methods. Consequently, most coal mine gas was directly discharged into the atmosphere through extraction. This application's calculations are based on both direct emission to the atmosphere and combustion utilization. The calculation process is as follows.

[0105] 1) Directly discharged into the atmosphere.

[0106] (17).

[0107] (18).

[0108] (19).

[0109] Where: is the total volume of methane emitted during coal mining, is the mass of emitted methane, t ; is the density of methane, take 0.667, kg / m 3 ; is the carbon dioxide equivalent of carbon emissions, t; 29.8 is the global warming potential of methane relative to carbon dioxide over a 100-year timeframe; CI is the carbon emission intensity, ; is the coal output (raw coal output), t When a coal pillar is left, it is the quality of the coal produced; when no coal pillar is left, it is the quality of the mineable coal.

[0110] 2) Combustion utilization.

[0111] In the methane combustion power generation process, only the stage where methane burns in the combustor to produce carbon dioxide (CO2) is considered, ignoring the subsequent turbine and generator processes, and the combustion efficiency is set to 95%. The reaction equation for methane combustion is as follows.

[0112] (20).

[0113] According to the reaction equation, 1 mol of methane reacts to produce 1 mol of CO2. Therefore, the mass of CO2 is calculated as follows.

[0114] (twenty one).

[0115] (twenty two).

[0116] (twenty three).

[0117] Where: is the total volume of methane emitted during coal mining, is the mass of emitted methane, t ; is the density of methane, take 0.667, kg / m 3 ; The combustion efficiency of methane in the process of generating CO2 is taken as 95%; is the carbon dioxide equivalent of carbon emissions, t.

[0118] In this application, carbon emission intensity is the carbon emissions per ton of coal (i.e., carbon dioxide equivalent per ton of coal), which is calculated using the following formula.

[0119] (twenty four).

[0120] Where: CI is the carbon emission intensity, ; is the carbon dioxide equivalent of carbon emissions, t .

[0121] This application also provides an embodiment, which uses the carbon emission calculation method for underground coal mining provided in this application and the national methane emission factor method to calculate and compare the 32-2# coal seam of H Coal Mine (coal and gas outburst mine) in a certain area.

[0122] The 32-2# coal seam at the H Coal Mine requires a pillar. The recoverable coal volume is 4,328,768,100 tons, rounded off to 4,328,770 tons during calculation. The amount of coal required for the pillar is 244,000 tons, resulting in a total coal mass of 4,084,770 tons. The original gas content of the coal seam is 16.95 m³ / t, the residual gas content is 5.0837 m³ / t, and the remaining gas content is 2.1535 m³ / t.

[0123] The calculation process of the carbon emissions calculation method for underground coal mining provided in this application is as follows (round to three decimal places).

[0124] 1. Total volume of methane emissions.

[0125] 1) Methane emission volume of coal output.

[0126] For the calculation of the methane emission volume of the coal output, combined with the above data, according to formula (6) to formula (9), the total methane emission volume of the coal output part is calculated to be 60,440,271.192m 3 , of which the volume of methane emissions from the extraction phase is 48,471,083.705m 3 The volume of methane emissions from the exhaust system is 11,969,187.487m 3 .

[0127] 2) The volume of methane emissions from the coal pillar.

[0128] The methane emission from the coal pillar is only emitted through the extraction stage. Therefore, according to formula (10) to formula (11), combined with the above data, the methane emission volume of the coal pillar is 2,895,377.2m 3 .

[0129] In summary, the total volume of methane emissions from coal mine H in a certain area is 63,335,648.392m 3 The volume of methane emissions during the extraction phase is 51,366,460.905m 3 The volume of methane emissions from the exhaust system is 11,969,187.487m 3 .

[0130] 2. Carbon emission intensity.

[0131] 1) Directly discharged into the atmosphere.

[0132] The carbon emission intensity of coal mine H in a certain region is calculated by substituting the above data into formulas (17) to (19). The carbon emission is calculated to be 1,258,897.335 tCO2e. Of this, the carbon emission from the extraction phase is 1,020,990.584 tCO2e, accounting for 81.10%, and the carbon emission from the ventilation phase is 237,906.750 tCO2e, accounting for 18.90%. The carbon emission intensity is 0.308 tCO2e / t.

[0133] 2) Combustion utilization.

[0134] Assuming that all methane emitted during the extraction phase is burned, using Equations (20) to (24) and substituting the above data, we calculate that the total emissions from Mine H are 327,414.736 tCO₂e, of which 89,507.984 tCO₂e, or 27.34%, are from the extraction phase, and 237,906.752 tCO₂e, or 72.66%, are from the ventilation phase. The carbon emission intensity is 0.080 tCO₂e / t.

[0135] Mine H is a high-gas mine, and its methane emission factor is 11.35m 3 / t, combined with the recoverable coal volume of 4.32877 million tons, the methane emission factor method was used to calculate the mass of methane emitted to be 32,770.737 tons, and the carbon emission intensity was 0.226tCO2e / t.

[0136] Comparing the carbon emission calculation results obtained by this application with the carbon emission calculation results calculated by the methane emission factor method, the carbon emission calculation results obtained by this application are more accurate.

[0137] This application calculates carbon emissions from different stages of the underground coal mining process, constructing a more refined carbon emissions calculation model to achieve the following goals: 1. Detailing the different emission stages in the mining process, revealing the contribution of carbon emissions from each stage, thereby identifying the main emission sources and providing targeted emission reduction strategies. 2. Comparing carbon emissions before and after emission control measures, analyzing the emission reduction effects, and identifying appropriate emission reduction measures for the mine.

[0138] Based on the same inventive concept, embodiments of the present application also provide an underground coal mining carbon emissions calculation device for implementing the aforementioned underground coal mining carbon emissions calculation method. The solution provided by this device is similar to the solution described in the aforementioned method. Therefore, the specific limitations of one or more embodiments of the underground coal mining carbon emissions calculation device provided below can be found in the above-mentioned limitations of the underground coal mining carbon emissions calculation method and are not further elaborated here.

[0139] In an exemplary embodiment, a device for calculating carbon emissions from underground coal mining is provided, comprising: a data acquisition module for acquiring the original gas content, residual gas content, and remaining gas content of a target coal seam through a sensor.

[0140] The volume determination module under the condition of leaving a coal pillar is used to obtain the methane emission volume under the condition of leaving a coal pillar based on the original gas content, residual gas content and remaining gas content of the target coal seam if a coal pillar is left during the coal mining process of the target coal seam; the methane emission volume under the condition of leaving a coal pillar includes: the methane emission volume of the coal pillar extraction link, the methane emission volume of the coal output extraction link and the methane emission volume of the coal output ventilation link.

[0141] The total volume determination module under the condition of leaving a coal pillar is used to obtain the total volume of methane emissions during the coal mining process under the condition of leaving a coal pillar based on the methane emission volume under the condition of leaving a coal pillar.

[0142] The module for determining the carbon emission intensity under the condition of leaving a coal pillar is used to obtain the carbon emission intensity under the condition of leaving a coal pillar based on the total volume of methane emissions during the coal mining process under the condition of leaving a coal pillar and the methane emission pattern during the mining process of the target coal seam.

[0143] The volume determination module for the case where no coal pillar is left is used to obtain the methane emission volume without leaving a coal pillar based on the original gas content, residual gas content and remaining gas content of the target coal seam if no coal pillar is left during the coal mining process of the target coal seam; the methane emission volume without leaving a coal pillar includes the methane emission volume of the extraction link and the methane emission volume of the ventilation link when no coal pillar is left.

[0144] The total volume determination module under the condition that no coal pillar is left is used to obtain the total volume of methane emissions in the coal mining process under the condition that no coal pillar is left, based on the methane emission volume under the condition that no coal pillar is left.

[0145] The module for determining the carbon emission intensity without leaving coal pillars is used to obtain the carbon emission intensity without leaving coal pillars based on the total volume of methane emissions during coal mining without leaving coal pillars and the methane emission pattern during coal mining in the target coal seam.

[0146] In an exemplary embodiment, a computer device is provided. The computer device may be a server or a terminal. The internal structure diagram thereof may be as follows: Figure 4 As shown. The computer device includes a processor, a memory, an input / output interface (Input / Output, abbreviated as I / O) and a communication interface. The processor, memory and input / output interface are connected through a system bus, and the communication interface is connected to the system bus through the input / output interface. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and computer program in the non-volatile storage medium. The database of the computer device is used to store carbon emission calculation data of underground coal mining. The input / output interface of the computer device is used to exchange information between the processor and an external device. The communication interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, a method for calculating carbon emissions from underground coal mining by processing video tags is implemented.

[0147] In an exemplary embodiment, a computer-readable storage medium is provided, storing a computer program, which implements the above-mentioned method embodiments when executed by a processor.

[0148] In an exemplary embodiment, a computer program product is provided, including a computer program. When the computer program is executed by a processor, the above method embodiments are implemented.

[0149] The technical features of the above embodiments can be combined arbitrarily. 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 this specification.

[0150] This document uses specific examples to illustrate the principles and implementation methods of this application. The description of the above examples is only intended to help understand the method and core concept of this application. At the same time, for those skilled in the art, based on the concept of this application, there may be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting this application.

Claims

1. A method for calculating carbon emissions from underground coal mining, characterized in that: The method for calculating carbon emissions from underground coal mining includes: The original gas content, residual gas content and remaining gas content of the target coal seam are obtained through sensors; If a coal pillar is left during the mining process of the target coal seam, the methane emission volume under the condition of leaving the coal pillar is obtained based on the original gas content, residual gas content and residual gas content of the target coal seam; the methane emission volume under the condition of leaving the coal pillar includes: the methane emission volume of the extraction link of leaving the coal pillar, the methane emission volume of the coal extraction link and the methane emission volume of the coal exhaust link; Based on the methane emission volume when the coal pillar is left, the total methane emission volume during the coal mining process when the coal pillar is left is obtained; Based on the total volume of methane emissions during coal mining with a coal pillar and the methane emission pattern during mining in the target coal seam, the carbon emission intensity of the coal pillar is obtained. If no coal pillar is left during the mining process of the target coal seam, the methane emission volume without coal pillar is obtained based on the original gas content, residual gas content and residual gas content of the target coal seam; the methane emission volume without coal pillar includes the methane emission volume of the extraction link and the methane emission volume of the ventilation link without coal pillar; Based on the methane emission volume without coal pillars, the total methane emission volume during coal mining without coal pillars was obtained. Based on the total volume of methane emissions during coal mining without leaving coal pillars and the methane emission pattern during coal mining in the target coal seam, the carbon emission intensity without leaving coal pillars was obtained.

2. The method for calculating carbon emissions from underground coal mining according to claim 1, characterized in that: Based on the original gas content, residual gas content and remaining gas content of the target coal seam, the methane emission volume under the condition of leaving a coal pillar is obtained, specifically including: Based on the original gas content, residual gas content and coal quality of the target coal seam, the methane emission volume of the coal extraction process is obtained when a coal pillar is left. Based on the residual gas content, remaining gas content and coal quality of the target coal seam, the methane emission volume of the coal exhaust link is obtained when the coal pillar is left. Based on the original gas content, residual gas content and the mass of the coal in the coal pillar of the target coal seam, the methane emission volume of the coal pillar extraction link is obtained when the coal pillar is retained.

3. The method for calculating carbon emissions from underground coal mining according to claim 1, characterized in that: Based on the original gas content, residual gas content and residual gas content of the target coal seam, the methane emission volume without leaving a coal pillar is obtained, specifically including: Based on the original gas content, residual gas content and quality of the mineable coal of the target coal seam, the methane emission volume of the extraction process without leaving a coal pillar is obtained; Based on the residual gas content, residual gas content and quality of mineable coal in the target coal seam, the methane emission volume of the air exhaust link without leaving a coal pillar is obtained.

4. The method for calculating carbon emissions from underground coal mining according to claim 1, characterized in that: Based on the total volume of methane emissions during coal mining with a coal pillar and the methane emission pattern during mining in the target coal seam, the carbon emission intensity of the coal pillar is obtained, including: If the methane emission method during the mining process of the target coal seam is direct emission into the atmosphere, the carbon emission intensity under the coal pillar is obtained based on the total volume of methane emitted during the mining process under the coal pillar. If the methane emission method during the mining process of the target coal seam is combustion utilization, the carbon emission intensity under the condition of leaving a coal pillar is obtained based on the combustion efficiency of methane combustion to generate carbon dioxide and the total volume of methane emissions during the mining process under the condition of leaving a coal pillar.

5. The method for calculating carbon emissions from underground coal mining according to claim 1, characterized in that: Based on the total volume of methane emissions during coal mining without leaving coal pillars and the methane emission pattern during coal mining in the target coal seam, the carbon emission intensity without leaving coal pillars is obtained, including: If the methane emission method during the mining process of the target coal seam is direct emission into the atmosphere, the carbon emission intensity without coal pillars is obtained based on the total volume of methane emitted during the mining process without coal pillars. If the methane emission method during the target coal seam mining process is combustion utilization, the carbon emission intensity without leaving a coal pillar is obtained based on the combustion efficiency in the process of methane combustion to generate carbon dioxide and the total volume of methane emissions during the coal mining process without leaving a coal pillar.

6. The method for calculating carbon emissions from underground coal mining according to claim 1, characterized in that: If a coal pillar is left during the mining process of the target coal seam, the following shall be included before obtaining the methane emission volume under the condition of leaving a coal pillar based on the original gas content, residual gas content and remaining gas content of the target coal seam: The calculation range is determined based on the strike length, dip length and thickness of the target coal seam.

7. A device for calculating carbon emissions from underground coal mining, characterized in that: The underground coal mining carbon emission calculation device includes: A data acquisition module is used to obtain the original gas content, residual gas content and remaining gas content of the target coal seam through sensors; A volume determination module for the case of a coal pillar being left, which is used to determine the methane emission volume under the condition of a coal pillar being left, based on the original gas content, residual gas content, and remaining gas content of the target coal seam, if a coal pillar is left during the mining process of the target coal seam; the methane emission volume under the condition of a coal pillar being left includes: the methane emission volume of the coal pillar extraction link, the methane emission volume of the coal output extraction link, and the methane emission volume of the coal output ventilation link; A total volume determination module under the condition of leaving a coal pillar, used to obtain the total volume of methane emissions during the coal mining process under the condition of leaving a coal pillar based on the methane emission volume under the condition of leaving a coal pillar; A module for determining carbon emission intensity under the condition of leaving a coal pillar, which is used to obtain the carbon emission intensity under the condition of leaving a coal pillar based on the total volume of methane emissions during the coal mining process under the condition of leaving a coal pillar and the methane emission pattern during the coal mining process of the target coal seam; A volume determination module for the case where no coal pillars are left is used to determine the methane emission volume under the case where no coal pillars are left, based on the original gas content, residual gas content, and remaining gas content of the target coal seam, if no coal pillars are left during the mining process of the target coal seam. The methane emission volume under the case where no coal pillars are left includes the methane emission volume of the extraction link and the methane emission volume of the ventilation link under the case where no coal pillars are left; A total volume determination module for a case where no coal pillar is left, for obtaining the total volume of methane emissions during the coal mining process without leaving a coal pillar based on the volume of methane emissions without leaving a coal pillar; The module for determining the carbon emission intensity without leaving coal pillars is used to obtain the carbon emission intensity without leaving coal pillars based on the total volume of methane emissions during the coal mining process without leaving coal pillars and the methane emission pattern during the mining process of the target coal seam.

8. A computer device comprising: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the method for calculating carbon emissions from underground coal mining according to any one of claims 1 to 6.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method for calculating carbon emissions from underground coal mining according to any one of claims 1 to 6 is implemented.

10. A computer program product comprising a computer program, characterized in that When the computer program is executed by a processor, the method for calculating carbon emissions from underground coal mining according to any one of claims 1 to 6 is implemented.

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