Carbon emission reduction accounting method for producing gravel aggregate from waste rocks

Abstract

The invention aims to provide a carbon emission reduction accounting method for sandstone aggregate production from waste rocks in order to solve the problem that there is no suitable method for carbon emission reduction accounting for sandstone aggregate production from waste rocks in the prior art. The method comprises the following steps: step 1, determining an accounting boundary: determining carbon emission of the whole process of gravel aggregate production by adopting a life cycle evaluation method; and step 2, determining an accounting method, wherein the accounting of the carbon emission reduction is obtained through the gravel aggregate yield and the unit gravel aggregate production carbon emission reduction, and the unit gravel aggregate carbon emission reduction is obtained through the difference value between the gravel aggregate carbon emission of the sandy soil mine production unit under the datum line scene and the gravel aggregate carbon emission of the waste rock production unit under the target project scene. According to the method, the carbon emission in the whole life cycle process of ore extraction, ore transportation and gravel aggregate production is specifically considered, the carbon emission reduction amount of the waste rock for replacing the gravel aggregate can be accurately calculated, and reference data can be provided for formulating a reasonable carbon emission reduction path.

Description

Technical Field

[0001] The present invention belongs to the technical field of carbon emission reduction in solid waste resource utilization, and in particular relates to a carbon emission reduction accounting method for producing sand and gravel aggregates from waste rocks. Background Art

[0002] Mining provides impetus for economic and social development through the supply of energy and resources, and has made outstanding contributions to the development and progress of human society. However, mining is also a major energy-intensive and polluting industry. At present, regional ecological and environmental problems caused by mineral resource development and utilization activities have become one of the important issues facing my country's sustainable development.

[0003] In recent years, my country has incorporated comprehensive resource utilization and carbon peak and carbon neutrality goals into the overall layout of ecological civilization construction. Promoting the comprehensive utilization of bulk solid waste in the mining industry is of great significance to improving resource utilization efficiency, improving environmental quality, promoting the comprehensive green transformation of economic and social development, and helping to achieve the carbon peak and carbon neutrality goals as scheduled. Among them, the use of waste rock to produce sand and gravel aggregates is a beneficial measure to improve the utilization efficiency of mine solid waste resources. In actual work, it is necessary to calculate the carbon emission reduction of waste rock production of sand and gravel aggregates to provide its actual contribution to carbon emission reduction.

[0004] At present, there are three main ways to calculate carbon emissions: emission factor method, mass balance method, and actual measurement method.

[0005] 1. Emission factor method

[0006] Calculation formula:

[0007] According to the basic carbon accounting equation provided by IPCC: Greenhouse gas (GHG) emissions = activity data (AD) × emission factor (EF)

[0008] Among them, AD is the amount of production or consumption activities that lead to greenhouse gas emissions, such as the consumption of each fossil fuel, the consumption of limestone raw materials, the net amount of electricity purchased, the net amount of steam purchased, etc.; EF is the coefficient corresponding to the activity level data, including the carbon content per unit calorific value or elemental carbon content, oxidation rate, etc., which characterizes the greenhouse gas emission coefficient per unit of production or consumption activity. EF can be directly based on known data (i.e. default values) provided by IPCC, the US Environmental Protection Agency, the European Environment Agency, etc., or it can be estimated based on representative measurement data.

[0009] This method is applicable to relatively macro-level accounting, such as national, provincial, and city levels, and can roughly control the overall situation of a specific region. However, in actual work, due to differences in regional energy quality and unit combustion efficiency, various energy consumption statistics and carbon emission factor measurements are prone to large deviations, becoming the main source of errors in carbon emission accounting results.

[0010] 2. Mass balance method

[0011] Calculation formula:

[0012] For carbon dioxide, under the carbon mass balance method, carbon emissions are obtained by subtracting non-carbon dioxide carbon output from input carbon content: Carbon dioxide (CO2) emissions = (raw material input × raw material carbon content - product output × product carbon content - waste output × waste carbon content) × 44 / 12. Among them, 44 / 12 is the conversion factor of carbon into CO2 (i.e. the relative atomic mass of CO2 / C).

[0013] Calculating emissions using the carbon mass balance method based on specific facilities and process flows can reflect the actual emissions at the location where carbon emissions occur. It can not only distinguish the differences between various types of facilities, but also distinguish between individual and partial equipment. This method is especially convenient when equipment is constantly updated from year to year. Generally speaking, the main accounting method for corporate carbon emissions is the emission factor method, but in industrial production processes (such as desulfurization process emissions, chemical production enterprise process emissions and other non-fossil fuel combustion processes), the carbon balance method can be selected as appropriate.

[0014] 3. Actual measurement method

[0015] The actual measurement method is based on the actual measurement data of emission sources, and the relevant carbon emissions are summarized. There are two types of actual measurement methods, namely on-site measurement and off-site measurement.

[0016] On-site measurement is generally to install a carbon emission monitoring module in the continuous emission monitoring system (CEMS) to directly measure its emissions by continuously monitoring the concentration and flow rate; off-site measurement is to collect samples and send them to the relevant monitoring department, and use special detection equipment and technology for quantitative analysis. Compared with the two, the accuracy of on-site measurement is significantly higher than that of off-site measurement because the sampling gas may undergo adsorption reaction and dissociation during off-site measurement.

[0017] The existing carbon emission accounting methods are suitable for the carbon emission accounting of sand and gravel aggregates, and most of them use the emission factor method. However, there is no suitable method for the carbon emission reduction accounting method of waste rock production of sand and gravel aggregates, which is not conducive to the calculation of carbon emission reduction benefits of solid waste resource utilization in the mining industry. Therefore, it is necessary to conduct in-depth research on the carbon emission reduction accounting method of waste rock production of sand and gravel aggregates, and clarify the accounting boundaries and carbon emission reduction links. Summary of the invention

[0018] The purpose of the present invention is to provide a method for calculating carbon emission reductions in the production of sand and gravel aggregates from waste rock, in order to solve the problem that there is no suitable method for calculating carbon emission reductions in the production of sand and gravel aggregates from waste rock in the prior art. The present invention specifically considers the carbon emissions in the entire life cycle of ore mining, ore transportation, and sand and gravel aggregate production, and can accurately calculate the carbon emission reductions of sand and gravel aggregate production from waste rock substitution, which can provide reference data for formulating a reasonable carbon emission reduction path, and contribute to the resource utilization of waste and the green and low-carbon development of sand and gravel aggregates in my country.

[0019] To achieve the above object, the technical solution of the present invention is as follows:

[0020] A method for calculating carbon emission reduction in producing sand and gravel aggregate from waste rock, comprising the following steps:

[0021] Step 1: Determine the accounting boundary

[0022] Use life cycle assessment methods to determine the carbon emissions of the entire process of sand and gravel aggregate production, including mining, transportation and processing;

[0023] Step 2: Determine the accounting method

[0024] The carbon emission reduction is calculated through the output of sand and gravel aggregate produced by waste rock and the carbon emission reduction per unit of sand and gravel aggregate produced by waste rock. The carbon emission reduction per unit of sand and gravel aggregate produced by waste rock is calculated through the difference between the carbon emission per unit of sand and gravel aggregate produced by sand and soil mines under the baseline scenario and the carbon emission per unit of sand and gravel aggregate produced by waste rock under the target project scenario.

[0025] The calculation formula is as follows:

[0026] ET y =ER×P y Formula (1)

[0027] In the formula, ET y is the carbon emission reduction in year y, in kilograms of carbon dioxide (kg CO2); P y is the output of sand and gravel aggregate produced from waste rock in year y, in tons (t); ER is the carbon emission reduction per unit of waste rock produced from sand and gravel aggregate, in kilograms of carbon dioxide per ton of product (kg CO2 / t);

[0028] ER=BE-PE Formula (2)

[0029] Where BE is the carbon emission per unit of sand and gravel aggregate produced by sand mines under the baseline scenario (kg CO2 / t); PE is the carbon emission per unit of sand and gravel aggregate produced by waste rock under the target project scenario (kg CO2 / t).

[0030] Furthermore, in step 1, the accounting boundary under the baseline scenario includes emissions generated by on-site consumption of fossil fuels and power grid electricity, emissions generated by on-site use of explosives, carbon sink losses caused by on-site vegetation destruction, and emissions from the transportation of sand and soil mine ore; the accounting boundary under the target project scenario includes emissions generated by on-site consumption of fossil fuels and power grid electricity, as well as emissions from the transportation of mine waste rock.

[0031] Furthermore, in step 2, the calculation method for carbon emissions per unit of sand and gravel aggregate in sand mine production under the baseline scenario is:

[0032] BE=BE explore +BE trans +BE produce Formula (3)

[0033] Where, BE explore is the carbon emission of sand mining process under the baseline scenario, in kg CO2 / ton product (kg CO2 / t); BE trans is the emission from sand and soil transportation under the baseline scenario, in kg CO2 / ton of product (kg CO2 / t); BE produce It is the emission of sand and gravel aggregate produced by sand mines under the baseline scenario, in kilograms of carbon dioxide per ton of product (kg CO2 / t).

[0034] Furthermore, the calculation method for emissions from sand mining under the baseline scenario is:

[0035] DE explore =BE FC +BE EC +BE DC +BE LC Formula (4)

[0036] Where, BE FC BE is the emission generated by the consumption of fossil fuels at the sand mining site under the baseline scenario, in kilograms of carbon dioxide per ton of product (kg CO2 / t); EC BE is the emission generated by the use of grid electricity at the sand mining site under the baseline scenario, in kilograms of carbon dioxide per ton of product (kg CO2 / t); DC BE is the emission generated by the use of explosives in sand mining sites under the baseline scenario, in kilograms of carbon dioxide per ton of product (kg CO2 / t); LC It is the carbon sink loss caused by vegetation destruction at the sand mining site under the baseline scenario, in kilograms of carbon dioxide per ton of product (kg CO2 / t).

[0037] Furthermore, the calculation method for the emissions generated by the consumption of fossil fuels at the sand mining site under the baseline scenario is:

[0038]

[0039] In the formula, FC i The amount of type i fossil fuel consumed per unit of ore production at the sand and soil mining site, in tons / ton or cubic meters / ton (t / t or m 3 / t);EF HG,i is the carbon emission factor of type i fossil fuel, expressed in kg CO2 / ton of fossil fuel or kg CO2 / cubic meter of fossil fuel (kg CO2 / t or kg CO2 / m 3 ); f is the output ratio of sand and gravel aggregate produced by existing sand and soil mining technology, dimensionless.

[0040] Furthermore, the calculation method for the emissions generated by on-site consumption of grid electricity under the baseline scenario is:

[0041]

[0042] Where EC is the grid electricity consumed per unit of ore mining at the sand and soil mining site, expressed in kilowatt-hours per ton of product (kWh / t); EF EL is the emission factor of power grid electricity, with the unit of kg CO2 / kWh; f is the output ratio of sand and gravel aggregate produced by existing sand mine technology, which is dimensionless.

[0043] Furthermore, the calculation method for the emissions generated by the use of explosives at the sand mining site under the baseline scenario is:

[0044]

[0045] Where DC is the explosive consumption in the sand mining process, in kilograms per ton (kg / t); EF DC is the carbon emission factor for the use of explosives, with the unit of kilograms of carbon dioxide per ton of explosives (kg CO2 / t); f is the output ratio of sand and gravel aggregate produced by sand mines, dimensionless.

[0046] Furthermore, the calculation method for the carbon sink loss caused by vegetation destruction at the sand mining site under the baseline scenario is:

[0047]

[0048] Where P j is the original carbon density of vegetation type j, in kg CO2 / m2 2 ); j is the vegetation type; h is the mining depth of the sand mining site, in meters (m); ρ is the density of the sand mining site, in kilograms / cubic meter (t / m 3); f is the output ratio of sand and gravel aggregate produced by existing sand and soil mining technology, dimensionless.

[0049] Furthermore, the calculation method for the emissions from sand and soil mine transportation under the baseline scenario is:

[0050] BE trans =Q B ×EFF×DAF B Formula (9)

[0051] In the formula, Q B is the consumption of sand and soil ore for producing unit product sand and gravel aggregate, in ton / ton (t / t); EFF is the transport emission factor, in kg CO2 / ton·km (kg CO2 / t·km); DAF is the transport emission factor, in kg CO2 / t·km B It is the maximum round-trip distance for transporting sand and ore, in kilometers (km).

[0052] Furthermore, the calculation method for the emission of sand and gravel aggregate produced by sand mines under the baseline scenario is:

[0053] BE produce =∑ i (FC B，i ×EF HG，i )+EC B ×EF EL Formula (10)

[0054] In the formula, FC B,i The amount of type i fossil fuel consumed per unit of product in sand and soil production, expressed in tons / ton or cubic meters / ton (t / t or m 3 / t);EF HG,i is the carbon emission factor of type i fossil fuel, in kg CO2 / ton or kg CO2 / cubic meter (kg CO2 / t or kg CO2 / m 3 );EC B EF is the power consumption of the power grid per unit of product produced by sand and soil mining, in kilowatt-hours / ton (kwh / t); EL It is the emission factor of grid electricity, expressed in kg CO2 / kWh.

[0055] Furthermore, in step 2, the method for calculating carbon emissions under the target project activity scenario is:

[0056] PE=PE trans +PE produce Formula (11)

[0057] Where, PE trans is the emission of waste rock transportation process under the target project activity scenario, in kg CO2 / ton product (kg CO2 / t); PEproduce It is the emission of sand and gravel aggregate produced from waste rock under the target project activity scenario, in kilograms of carbon dioxide per ton of product (kg CO2 / t).

[0058] Furthermore, the calculation method for emissions from waste rock transportation under the target project activity scenario is as follows:

[0059] PE trans =Q P ×EFF×DAF P Formula (12)

[0060] In the formula, Q P is the waste rock consumption for producing unit product sand and gravel aggregate, in ton / ton (t / t); EFF is the transport emission factor, in kg CO2 / ton·km (kg CO2 / t·km); DAF is the waste rock consumption for producing unit product sand and gravel aggregate, in ton / ton (t / t); EFF is the transport emission factor, in kg CO2 / ton·km (kg CO2 / t·km); P The maximum round trip distance for transporting waste rock, in kilometers (km).

[0061] Furthermore, the calculation method for the emission of sand and gravel aggregates produced from waste rock under the target project activity scenario is as follows:

[0062] PEE produce =∑ i (FC P，i ×EF HG，i )+EC P ×EF EL Formula (13)

[0063] In the formula, FC P,i The amount of type i fossil fuel consumed per unit of product produced by waste rock, expressed in tonnes / tonne or cubic metres / tonne (t / t or m 3 / t);EF HG,i is the carbon emission factor of type i fossil fuel, in kg CO2 / ton or kg CO2 / cubic meter (kg CO2 / t or kg CO2 / m 3 );EC P The power grid electricity consumed per unit of waste rock production, in kilowatt-hours per ton (kWh / t); EF EL It is the emission factor of grid electricity, expressed in kg CO2 / kWh.

[0064] In addition, the present invention also provides a carbon emission reduction accounting system for producing sand and gravel aggregates from waste rock, including a database establishment module, a sand and gravel aggregate production module, a carbon emission calculation module and a carbon emission reduction calculation module;

[0065] The database establishment module is used to store sand and gravel aggregate production data;

[0066] The sand and gravel aggregate production module is used to calculate the ore quantity of the sand and gravel aggregate production process of the sand and gravel mine under the sand and gravel aggregate baseline scenario and the waste rock quantity of the waste rock production process of the sand and gravel aggregate under the target project scenario;

[0067] The carbon emission calculation module includes a unit carbon emission accounting module for producing sand and gravel aggregates from sand and soil mines under the baseline scenario and a unit carbon emission accounting module for producing sand and gravel aggregates from waste rock under the target project scenario, wherein:

[0068] The unit carbon emission accounting module for sand and gravel aggregate production in sand mines under the baseline scenario includes:

[0069] The carbon emission accounting unit for sand and soil mining is used to calculate the unit carbon emissions of the sand and soil mining stage through the emissions generated by on-site consumption of fossil fuels, the emissions generated by on-site use of power grid electricity, the emissions generated by on-site use of explosives, and the carbon sink loss caused by on-site vegetation destruction;

[0070] The carbon emission accounting unit for sand and soil transportation is used to calculate the unit carbon emission of the ore transportation stage through the transportation distance, the transportation emission factor of the transportation equipment and the sand and soil ore consumption for producing unit product sand and gravel aggregates;

[0071] The carbon emission accounting unit of the sand and gravel aggregate production stage of sand and soil mine production is used to calculate the unit carbon emission of the sand and gravel aggregate production stage through the consumption of fuel types corresponding to the production equipment and its carbon emission factor and the emissions generated by the production equipment using the power grid electricity;

[0072] The unit carbon emission accounting module for sand and gravel aggregate production from waste rock under the target project scenario includes:

[0073] The carbon emission accounting unit of the waste rock transportation stage is used to calculate the unit carbon emission of the waste rock transportation stage through the transportation distance, the transportation emission factor of the transportation equipment and the waste rock consumption of the unit product sand and gravel aggregate;

[0074] The carbon emission accounting unit of the waste rock production sand and gravel aggregate production stage is used to calculate the unit carbon emission of the waste rock aggregate production stage through the consumption of the fuel type corresponding to the production equipment and its carbon emission factor and the emission generated by the production equipment using the power grid electricity;

[0075] The carbon emission reduction calculation module is used to calculate the carbon emission reduction of sand and gravel aggregate produced by waste rock. The difference between the unit carbon emission of sand and gravel aggregate produced by sand and soil mines and the unit carbon emission of sand and gravel aggregate produced by waste rock is the unit carbon emission reduction of sand and gravel aggregate produced by waste rock. The carbon emission reduction of sand and gravel aggregate produced by waste rock is obtained by combining the output of sand and gravel aggregate produced by waste rock.

[0076] The present invention also provides a carbon emission reduction accounting device for producing sand and gravel aggregates from waste rock, which includes a memory and a processor, wherein the processor is used to implement the process of the above-mentioned carbon emission reduction accounting method based on producing sand and gravel aggregates from waste rock when executing the computer program stored in the memory.

[0077] Compared with the prior art, the present invention has the following beneficial effects:

[0078] 1. The method of the present invention can solve the problem of no standardized and standardized accounting method for carbon emission reduction assessment of sand and gravel aggregate production from waste rock in the sand and gravel aggregate industry. The present invention specifically considers the carbon emissions of sand and soil mining, sand and soil transportation, and the entire life cycle of sand and gravel aggregate production, and can accurately calculate the carbon emission reduction of sand and gravel aggregate production from waste rock.

[0079] 2. The method of the present invention can quantitatively evaluate the carbon emission reduction of producing sand and gravel aggregates through waste resource utilization, and can provide reference data for formulating a reasonable carbon emission reduction path.

[0080] 3. The method of the present invention can provide methodological support for the development of solid waste resource utilization and carbon reduction projects in the mining industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0081] Figure 1 , the composition of carbon emission reduction accounting factors for sand and gravel aggregate production from waste rock in the calculation method of the present invention.

[0082] Figure 2 , a schematic diagram of the carbon emission reduction accounting system for producing sand and gravel aggregate from waste rock of the present invention;

[0083] 201. Database establishment module, 202. Sand and gravel aggregate production module, 203. Carbon emission calculation module, 204. Carbon emission reduction calculation module. DETAILED DESCRIPTION

[0084] In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0085] Example 1

[0086] A method for calculating carbon emission reduction from waste rock production of sand and gravel aggregates. The composition of carbon emission reduction calculation factors for waste rock production of sand and gravel aggregates is shown in Figure 1 A sand and gravel aggregate production line of a certain enterprise is selected, with an annual output of 10 million tons of sand and gravel aggregate. The traditional process of producing sand and gravel aggregate using sand and soil mines is adopted. According to formula (3), the carbon emissions involved in the three links of sand and soil mine mining, transportation and sand and gravel aggregate production are involved.

[0087] According to formula (4), the sand mining process involves emissions generated by on-site consumption of fossil fuels, emissions generated by on-site use of power from the power grid, emissions generated by on-site use of explosives, and carbon sink losses caused by on-site vegetation destruction.

[0088] According to formula (5), after investigation, the energy-consuming equipment used in the sand and soil mining process mainly includes bulldozers, excavators, loaders and drilling equipment, and the main consumption is diesel. By consulting the diesel consumption statistics of equipment in the "Building Carbon Emission Calculation Standard", combined with the diesel emission factor (3.13kgCO2 / kg) and the target project scale survey data, it can be seen that the diesel energy consumption of crawler bulldozers is 0.6kg / t stone and the carbon emission is 1.88kgCO2 / t stone; the diesel energy consumption of loaders is 1.04kg / t stone and the carbon emission is 3.26kgCO2 / t stone; the diesel energy consumption of excavators is 0.62kg / t stone and the carbon emission is 1.94kgCO2 / t stone; the diesel energy consumption of drilling machines is 1.63kg / t stone and the carbon emission is 5.10kgCO2 / t stone. According to formula (5), the emission generated by fossil fuel consumption at the ore mining site is 12.18 kgCO2 / t stone. The output ratio of sand and gravel aggregate produced by sand and soil mine is 0.86, so the carbon emission from energy consumption in sand and soil mining is 14.16 kgCO2 / t sand and gravel aggregate product.

[0089] According to formula (7), after investigation, the explosive consumption data for calcareous sandstone is 0.5-0.6 kg / m 3 Considering the stacking density of sand mine (1.65t / m 3 ) The output ratio of sand and gravel aggregates in ore production is 0.86. After calculation, the average carbon emission of explosives in sand and soil mining is 0.085kg CO2 / t sand and gravel aggregate products.

[0090] According to formula (8), after investigation, the sand mine system is a forest system, and the unit vegetation carbon density is 10.859 kg CO2 / m 2 The sand and soil mining site has a mining depth of 200 meters and a sand and soil density of 1.65t / m 3 The output ratio of ore production to sand and gravel aggregate is 0.86. It is calculated that the loss of carbon absorption by original vegetation due to sand and soil mining is 0.028kgCO2 / t sand and gravel aggregate product.

[0091] The unit carbon emission in the sand mining stage is 14.16+0.085+0.028=14.525kg CO2 / t sand and gravel aggregate product.

[0092] According to formula (9), after investigating the transportation process, trucks are used to transport the aggregate to the sand and gravel production site. Combined with the transportation cost factor, the transportation distance is set to be about 100 km. Combined with the diesel truck transportation emission factor of 0.245 kg CO2 / (t·km) recommended in the "Building Carbon Emission Calculation Standard", the unit product ore transportation volume of sand and gravel aggregate produced by sand mines is 1.16. After calculation, the carbon emission of the sand and gravel transportation link is 28.42 kg CO2 / / t sand and gravel aggregate products.

[0093] According to formula (10), after investigation, the main energy-consuming equipment in the sand and gravel aggregate production process includes two parts: the crushing system and the screening system, involving vibrating feeders, jaw crushers, rod mills, belt conveyors, rod mills, etc. The main energy consumption is electricity, which consumes about 40.79 kWh / t of sand and gravel aggregate products. The average emission factor of the national power grid in 2022 published in the "Notice on Doing a Good Job in the Management of Greenhouse Gas Emission Reports of Power Generation Enterprises from 2023 to 2025" of the Ministry of Ecology and Environment is 0.5703 kgCO2 / kWh. After calculation, the unit product carbon emissions of sand and gravel aggregate produced by sand mines are approximately 23.26 kgCO2 / t of sand and gravel aggregate products.

[0094] According to formula (3), the carbon emission of the traditional process of producing unit sand and gravel aggregate in sand and soil mines under the target project scenario is 14.525+28.42+23.26=66.205kgCO2 / t stone.

[0095] According to formula (11), the use of waste rock to produce sand and gravel aggregate saves the ore mining process and only includes the carbon emissions from the transportation of waste rock to the sand and gravel aggregate production site and the carbon emissions during the sand and gravel aggregate production process.

[0096] Similar to the raw material transportation process in the production of sand and gravel aggregates from sand and soil mines, the energy-consuming equipment in the waste rock transportation process is mainly diesel trucks. Using the same 100 km transportation distance, according to formula (12), the carbon emissions per unit of sand and gravel aggregate production is calculated to be approximately 28.42 kg CO2 / / t sand and gravel aggregate product.

[0097] The energy-consuming equipment in the process of producing sand and gravel aggregate from waste rock is similar to that of producing sand and gravel aggregate from natural ore, mainly including crushing system and screening system. The difference is that since the particle size of waste rock is mostly distributed between 1 and 500 mm, compared with the production of sand and gravel aggregate from ore, the production of sand and gravel aggregate from waste rock can omit the coarse crushing step. According to formula (12), the carbon emission per unit product of sand and gravel aggregate from waste rock production is about 10.65 kgCO2 / t sand and gravel aggregate product.

[0098] According to formula (11), the carbon emission per unit of sand and gravel aggregate product produced from waste rock is 28.42+10.65=39.07kgCO2 / t sand and gravel aggregate product.

[0099] According to formula (2), the unit carbon emission reduction of sand and gravel aggregate per unit product of waste rock production is 66.205-39.07=27.135kgCO2 / t sand and gravel aggregate product.

[0100] According to formula (1), combined with the company's annual production of 10 million tons of sand and gravel aggregate products, it can be known that the company's annual emission reduction is 27.135 kgCO2 / t sand and gravel aggregate products × 10 million tons = 271,350 tons of CO2.

[0101] Example 2

[0102] This embodiment provides a carbon emission reduction accounting system for producing sand and gravel aggregates from waste rock. Figure 1 , including a database establishment module 201, a sand and gravel aggregate production module 202, a carbon emission calculation module 203 and a carbon emission reduction calculation module 204;

[0103] The database establishment module is used to store sand and gravel aggregate production data;

[0104] The sand and gravel aggregate production module is used to calculate the ore quantity of the sand and gravel aggregate production process of the sand and gravel mine under the baseline scenario and the waste rock quantity of the sand and gravel aggregate production process of the waste rock production process under the target project scenario;

[0105] The carbon emission calculation module includes a unit carbon emission accounting module for producing sand and gravel aggregates from sand and soil mines under the baseline scenario and a unit carbon emission accounting module for producing sand and gravel aggregates from waste rock under the target project scenario, wherein:

[0106] The unit carbon emission accounting module for sand and gravel aggregate production in sand mines under the baseline scenario includes:

[0107] The carbon emission accounting unit for sand and soil mining is used to calculate the unit carbon emissions in the ore mining stage through the emissions generated by on-site consumption of fossil fuels, the emissions generated by on-site use of power grid electricity, the emissions generated by on-site use of explosives, and the carbon sink loss caused by on-site vegetation destruction;

[0108] The carbon emission accounting unit of the sand and soil transportation stage is used to calculate the unit carbon emission of the sand and soil transportation stage through transportation distance, transportation equipment and corresponding fuel type consumption and its carbon emission factor;

[0109] The carbon emission accounting unit of the sand and gravel aggregate production stage of sand and soil mine production is used to calculate the unit carbon emission of the sand and gravel aggregate production stage through the fuel type consumption and carbon emission factor corresponding to the production equipment;

[0110] The unit carbon emission accounting module for waste rock production of sand and gravel aggregate under the target project scenario includes:

[0111] Carbon emission accounting unit for waste rock transportation stage, used to calculate unit carbon emission for waste rock transportation stage through transportation distance, transportation equipment and corresponding fuel type consumption and carbon emission factor;

[0112] The carbon emission accounting unit of the sand and gravel aggregate production stage of waste rock production is used to calculate the unit carbon emission of the sand and gravel aggregate production stage through the fuel type consumption and carbon emission factor corresponding to the production equipment;

[0113] The carbon emission reduction calculation module is used to calculate the carbon emission reduction of sand and gravel aggregate produced from waste rock. The difference between the unit carbon emission of sand and gravel aggregate produced from sand and soil mines and the unit carbon emission of sand and gravel aggregate produced from waste rock is the unit carbon emission reduction of sand and gravel aggregate produced from waste rock. The carbon emission reduction of sand and gravel aggregate produced from waste rock is obtained by combining the sand and gravel output.

[0114] Example 3

[0115] This embodiment provides a device for calculating carbon emission reduction of sand and gravel aggregate produced from waste rock, the device comprising a memory and a processor, wherein the processor is used to implement a process based on a method for calculating carbon emission reduction of sand and gravel aggregate produced from waste rock when executing a computer program stored in the memory, the steps of which are as follows:

[0116] S1. To calculate the unit carbon emissions of sand and gravel aggregates produced by sand and soil mines under the baseline scenario, it is necessary to determine the carbon emissions of sand and soil mining, sand and soil transportation, and sand and gravel aggregate production. Calculation of the sand and soil mining link is mainly related to equipment type, energy type and amount, energy carbon emission factor, vegetation destruction type, vegetation carbon density, and explosive usage. Calculation of carbon emissions in the sand and soil transportation link and sand and gravel aggregate production link is mainly related to equipment type, energy type and amount, and energy carbon emission factor. Then add the unit carbon emissions of sand and soil mining, ore transportation, and sand and gravel aggregate production to obtain the unit carbon emissions of sand and gravel aggregates produced by sand and soil mines under the baseline scenario.

[0117] S2. To calculate the unit carbon emissions of sand and gravel aggregate produced from waste rock under the target project scenario, it is necessary to determine the carbon emissions of the waste rock transportation link and the sand and gravel aggregate production link. The calculation of carbon emissions in the waste rock transportation link and the sand and gravel aggregate production link is mainly related to the type of transportation equipment, the type and amount of energy used, and the energy carbon emission factor. Then add the unit carbon emissions of the waste rock transportation link and the sand and gravel aggregate production link to obtain the unit carbon emissions of sand and gravel aggregate produced from waste rock under the target project scenario.

[0118] S3. To calculate the carbon emission reduction of sand and gravel aggregate produced from waste rock, it is necessary to determine the carbon emission reduction per unit of sand and gravel aggregate produced from waste rock by taking the difference between the carbon emission per unit of sand and gravel aggregate produced from sand and soil mines under the baseline scenario and the carbon emission per unit of sand and gravel aggregate produced from waste rock under the target project scenario, and then determine the carbon emission reduction per unit of sand and gravel aggregate produced from waste rock in combination with the sand and gravel output.

[0119] The principle of the present invention is: the present invention takes into account the carbon emission process of the entire life cycle of sand and gravel aggregate production, including the sand and soil mining link, the transportation link and the sand and gravel aggregate production link, so that the carbon emission reduction results of waste stone production of sand and gravel aggregate are calculated more accurately. According to the difference between the unit carbon emissions of the entire life cycle of sand and gravel aggregate production from baseline sand and soil mines and the unit carbon emissions of the entire life cycle of sand and gravel aggregate production from waste rock under the target project scenario, the carbon emission reduction per unit of sand and gravel aggregate production from waste rock can be obtained. Combined with the sand and gravel aggregate output, the carbon emission reduction of sand and gravel aggregate production using waste rock as a substitute can be accurately and conveniently calculated. The calculation method developed by the present invention can solve the problem of the lack of standardized and standardized calculation methods for carbon emission reduction assessment of sand and gravel aggregate production from waste rock in the sand and gravel aggregate industry, promote raw material substitution in the sand and gravel aggregate industry, reduce the mining of natural sand and soil mines, and reduce ecological damage and carbon emissions.

[0120] The carbon emission reduction accounting method for producing sand and gravel aggregates from waste rock of the present invention takes into account the whole life cycle of sand and gravel aggregate production. When calculating carbon emissions, it takes into account the scenarios involving energy activities in the whole life cycle of sand and gravel aggregate production, the carbon emissions from explosive blasting during ore mining, and the carbon loss calculation content caused by the destruction of the original vegetation ecosystem caused by ore mining. The carbon emission reduction accounting method for producing sand and gravel aggregates from different types of waste rock or tailings using the same process is also applicable to the present invention.

[0121] The above shows and describes the basic principle, main features and advantages of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention claimed.

Claims

1. A method for calculating carbon emission reduction in the production of sand and gravel aggregates from waste rock, characterized in that: The steps include: Step 1: Determine the accounting boundary Use life cycle assessment methods to determine the carbon emissions of the entire process of sand and gravel aggregate production, including mining, transportation and processing; Step 2: Determine the accounting method The carbon emission reduction is calculated through the output of sand and gravel aggregate produced by waste rock and the carbon emission reduction per unit of sand and gravel aggregate produced by waste rock. The carbon emission reduction per unit of sand and gravel aggregate produced by waste rock is calculated through the difference between the carbon emission per unit of sand and gravel aggregate produced by sand and soil mines under the baseline scenario and the carbon emission per unit of sand and gravel aggregate produced by waste rock under the target project scenario. The calculation formula is as follows: ET y =ER×P y Formula (1) In the formula, ET y is the carbon emission reduction in year y, in kg of carbon dioxide; P y is the output of sand and gravel aggregate produced from waste rock in year y, in tons; ER is the carbon emission reduction per unit of waste rock produced from sand and gravel aggregate, in kg CO2 / ton of product; ER=BE-PE Formula (2) Where BE is the carbon emission per unit of sand and gravel aggregate produced by sand and soil mines under the baseline scenario, in kilograms of carbon dioxide; PE is the carbon emission per unit of sand and gravel aggregate produced by waste rock under the target project scenario, in kilograms of carbon dioxide.

2. The carbon emission reduction accounting method for producing sand and gravel aggregate from waste rock according to claim 1 is characterized in that: In step 1, the accounting boundary under the baseline scenario includes emissions generated by on-site consumption of fossil fuels and power grid electricity, emissions generated by on-site use of explosives, carbon sink losses caused by on-site vegetation destruction, and emissions from sand and soil mine ore transportation; the accounting boundary under the target project scenario includes emissions generated by on-site consumption of fossil fuels and power grid electricity, as well as emissions from mine waste rock transportation.

3. The carbon emission reduction accounting method for producing sand and gravel aggregate from waste rock according to claim 1 is characterized in that: In step 2, the calculation method for carbon emissions per unit of sand and gravel aggregate in sand mine production under the baseline scenario is: BE = BE explore + BE trans + BE produce Formula (3) Where, BE explore is the carbon emission of sand mining process under the baseline scenario, in kg CO2 / ton of product; BE trans is the emission from sand and soil transportation under the baseline scenario, in kg CO2 / ton of product; BE produce It is the emission of sand and gravel aggregate produced by sand mines under the baseline scenario, in kg CO2 / ton of product.

4. The carbon emission reduction accounting method for producing sand and gravel aggregate from waste rock according to claim 3 is characterized in that: The calculation method for emissions from sand mining under the baseline scenario is: BE explore = BE FC + BE EC + BE DC + BE LC Formula (4) Where, BE FC BE is the emission generated by the consumption of fossil fuels at the sand mining site under the baseline scenario, in kg CO2 / ton of product; EC BE is the emission generated by the use of grid electricity at the sand mining site under the baseline scenario, in kg CO2 / ton of product; DC BE is the emission generated by the use of explosives on site in sand and soil mining under the baseline scenario, in kg CO2 / ton of product; LC It is the amount of carbon sink loss caused by vegetation destruction at the sand mining site under the baseline scenario, in kilograms of carbon dioxide per ton of product.

5. The carbon emission reduction accounting method for producing sand and gravel aggregate from waste rock according to claim 4 is characterized in that: The calculation method for the emissions generated by the consumption of fossil fuels at the sand mining site under the baseline scenario is: In the formula, FC i EF is the amount of type i fossil fuel consumed per unit of ore mining at the sand and soil mining site, in tons / ton or cubic meters / ton; HG,i is the carbon emission factor of type i fossil fuel, expressed in kg CO2 / ton of fossil fuel or kg CO2 / cubic meter of fossil fuel; f is the output ratio of sand and gravel aggregate produced by existing sand and soil mine technology, dimensionless; The calculation method for the emissions generated by on-site consumption of grid electricity under the baseline scenario is: Where EC is the power grid electricity consumed per unit of ore mining at the sand and soil mining site, in kWh / ton of product; EF EL is the emission factor of power grid electricity, in kg CO2 / kWh; f is the output ratio of sand and gravel aggregate produced by existing sand and soil mine technology, dimensionless; The calculation method for emissions from the use of explosives at sand mining sites under the baseline scenario is: Where, DC is the explosive consumption in the sand mining process, in kg / ton; EF is the explosive consumption in the sand mining process, in kg / ton; DC is the carbon emission factor for explosives use, in kg CO2 / ton of explosives; f is the output ratio of sand and gravel aggregate produced by sand and soil mines, dimensionless; The calculation method for the carbon sink loss caused by vegetation destruction at the sand mining site under the baseline scenario is: Where P j is the carbon density of the original j-type vegetation, in kilograms of carbon dioxide per square meter; j is the vegetation type; h is the mining depth of the sand mining site, in meters; ρ is the density of the sand mine, in kilograms per cubic meter; f is the output ratio of sand and gravel aggregate produced by the existing technology of sand mines, dimensionless.

6. The carbon emission reduction accounting method for producing sand and gravel aggregate from waste rock according to claim 3 is characterized in that: The calculation method for emissions from sand and soil mine transportation under the baseline scenario is: B.E. trans =Q B ×EFF×DAF B Formula(9) In the formula, Q B is the consumption of sand and soil ore for producing unit product sand and gravel aggregate, in tons / tons; EFF is the transportation emission factor, in kilograms of carbon dioxide / ton·km; DAF is the transportation emission factor, in kilograms of carbon dioxide / ton·km B It is the maximum round-trip distance for transporting sand and ore, measured in kilometers.

7. The carbon emission reduction accounting method for producing sand and gravel aggregate from waste rock according to claim 3 is characterized in that: The calculation method for sand and gravel aggregate emissions from sand mine production under the baseline scenario is: BE produce =∑ i (FC B,i ×EF HG,i )+EC B ×EF EL Formula (10) In the formula, FC B,i The amount of type i fossil fuel consumed per unit of product in the production of sand and soil ore, in tons / ton or cubic meters / ton; EF HG,i is the carbon emission factor of type i fossil fuel, expressed in kg CO2 / ton or kg CO2 / m3; EC B EF is the amount of electricity consumed by the grid for each unit of product produced by sand and soil mining, in kWh / ton; EL is the emission factor of grid electricity, expressed in kg CO2 / kWh.

8. The carbon emission reduction accounting method for producing sand and gravel aggregate from waste rock according to claim 1 is characterized in that: In step 2, the calculation method of carbon emissions under the target project activity scenario is: PE = PE trans +PE produce Formula (11) Where, PE trans is the emission of waste rock transportation process under the target project activity scenario, in kg CO2 / ton product; PE produce is the emissions from waste rock production of sand and gravel aggregate under the target project activity scenario, in kg CO2 / ton of product; Among them, the calculation method for emissions from waste rock transportation under the target project activity scenario is: PE trans =Q P ×EFF×DAF P Formula(12) In the formula, Q P is the waste rock consumption in producing unit product sand and gravel aggregate, in tons / ton; EFF is the transportation emission factor, in kilograms of carbon dioxide / ton·km; DAF ... P is the maximum round trip distance for transporting waste rock, in kilometers; The calculation method for the emission of sand and gravel aggregates from waste rock production under the target project activity scenario is as follows: PE produce =∑ i (FC P,i ×EF HG,i )+EC P ×EF EL Formula (13) In the formula, FC P,i The amount of type i fossil fuel consumed per unit of product produced by waste rock, expressed in tonnes / tonne or cubic metres / tonne; EF HG,i is the carbon emission factor of type i fossil fuel, in kg CO2 / ton or kg CO2 / m3; EC P The amount of grid electricity consumed per unit of waste rock production, expressed in kWh / ton; EF EL is the emission factor of grid electricity, expressed in kg CO2 / kWh.

9. A carbon emission reduction accounting system for producing sand and gravel aggregates from waste rock, characterized in that: It includes database establishment module, sand and gravel aggregate production module, carbon emission calculation module and carbon emission reduction calculation module; The database establishment module is used to store sand and gravel aggregate production data; The sand and gravel aggregate production module is used to calculate the ore quantity of the sand and gravel aggregate production process of the sand and gravel aggregate under the sand and gravel aggregate baseline scenario and the waste rock quantity of the waste rock production process of the sand and gravel aggregate under the target project scenario; The carbon emission calculation module includes a unit carbon emission accounting module for producing sand and gravel aggregates from sand and soil mines under the baseline scenario and a unit carbon emission accounting module for producing sand and gravel aggregates from waste rock under the target project scenario, wherein: The unit carbon emission accounting module for sand and gravel aggregate production in sand mines under the baseline scenario includes: The carbon emission accounting unit for sand and soil mining is used to calculate the unit carbon emissions of the sand and soil mining stage through the emissions generated by on-site consumption of fossil fuels, the emissions generated by on-site use of power grid electricity, the emissions generated by on-site use of explosives, and the carbon sink loss caused by on-site vegetation destruction; The carbon emission accounting unit for sand and soil transportation is used to calculate the unit carbon emission of the ore transportation stage through the transportation distance, the transportation emission factor of the transportation equipment and the sand and soil ore consumption for producing unit product sand and gravel aggregates; The carbon emission accounting unit of the sand and gravel aggregate production stage of sand and soil mine production is used to calculate the unit carbon emission of the sand and gravel aggregate production stage through the consumption of fuel types corresponding to the production equipment and its carbon emission factor and the emissions generated by the production equipment using the power grid electricity; The unit carbon emission accounting module for sand and gravel aggregate production from waste rock under the target project scenario includes: The carbon emission accounting unit of the waste rock transportation stage is used to calculate the unit carbon emission of the waste rock transportation stage through the transportation distance, the transportation emission factor of the transportation equipment and the waste rock consumption of the unit product sand and gravel aggregate; The carbon emission accounting unit of the waste rock production sand and gravel aggregate production stage is used to calculate the unit carbon emission of the waste rock aggregate production stage through the consumption of the fuel type corresponding to the production equipment and its carbon emission factor and the emission generated by the production equipment using the power grid electricity; The carbon emission reduction calculation module is used to calculate the carbon emission reduction of sand and gravel aggregate produced by waste rock. The difference between the unit carbon emission of sand and gravel aggregate produced by sand and soil mines and the unit carbon emission of sand and gravel aggregate produced by waste rock is the unit carbon emission reduction of sand and gravel aggregate produced by waste rock. The carbon emission reduction of sand and gravel aggregate produced by waste rock is obtained by combining the output of sand and gravel aggregate produced by waste rock.

10. A carbon emission reduction accounting device for producing sand and gravel aggregates from waste rock, characterized in that: The device includes a memory and a processor, wherein the processor is used to implement the process of the above-mentioned carbon emission reduction accounting method for producing sand and gravel aggregates based on waste rock when executing the computer program stored in the memory.

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