CN-122022120-A - Carbon footprint accounting method for granulated blast furnace slag powder product

CN122022120ACN 122022120 ACN122022120 ACN 122022120ACN-122022120-A

Abstract

The invention relates to a carbon footprint accounting method of granulated blast furnace slag powder products, which comprises the following steps of determining a system boundary for carbon footprint accounting according to an internationally universal life cycle evaluation standard, collecting primary data and secondary data according to the determined system boundary, integrating the primary data and the secondary data to account for total carbon footprint in the whole system boundary, distributing symbiotic products of granulated blast furnace slag powder by adopting a layered progressive distribution strategy to obtain a distribution result of the symbiotic products, and obtaining the carbon footprint of the granulated blast furnace slag powder products based on the total carbon footprint and the distribution result of the symbiotic products. Compared with the prior art, the invention has the advantages of science, standardization and the like.

Inventors

Yao Xinqian
XU SHAOBING
ZHANG MINGMING
TANG BINGQING

Assignees

欧冶云商股份有限公司

Dates

Publication Date: 20260512
Application Date: 20251222

Claims (10)

1. A method of carbon footprint accounting for granulated blast furnace slag powder products, comprising the steps of: Determining a system boundary for carbon footprint accounting according to internationally universal life cycle evaluation criteria; Acquiring primary data and secondary data according to the determined system boundary; Integrating the primary data and the secondary data, and accounting the total carbon footprint in the boundary of the whole system; adopting a layered progressive distribution strategy to distribute symbiotic products of the granulated blast furnace slag powder to obtain a distribution result of the symbiotic products; and obtaining the carbon footprint of the granulated blast furnace slag powder product based on the total carbon footprint and the distribution result of the symbiotic product.
2. The method for carbon footprint accounting of granulated blast furnace slag powder product according to claim 1, wherein the system boundary of the carbon footprint accounting is A1-A3 product stage, wherein A1 stage is an upstream production stage, A2 stage is a transportation stage, and A3 stage is a core production and manufacturing stage.
3. The method for carbon footprint accounting of a granulated blast furnace slag powder product according to claim 2, wherein the primary data is obtained from stage A3, the primary data comprising: Energy data including yield and heat value of outsourced power structure, blast furnace gas/converter gas/coke oven gas; Raw material data including chemical components, water content, transportation mode and mileage of the blast furnace slag; auxiliary material data including grinding aid type, consumption, source and transportation information.
4. The method of carbon footprint accounting for a granulated blast furnace slag powder product according to claim 2, wherein the secondary data is obtained from A1 stage and A2 stage, the secondary data comprising: the energy consumption of the production process comprises the power consumption of a vertical mill system and the fuel consumption of a hot blast stove; material balance, including water slag input amount, finished mineral powder output amount, fine powder recovery rate and waste residue output amount; Emission data, including concentration and emission of CO 2 、NOx、SO 2 in the waste gas, COD of the waste water, indexes of suspended matters and treatment of solid waste.
5. The method of carbon footprint accounting for a granulated blast furnace slag powder product as claimed in claim 1, wherein the step of integrating the primary data with the secondary data comprises: Carrying out unified standardization processing on the primary data and the secondary data, and constructing a material and energy balance table; Calculating balance difference of materials and energy based on the materials and energy balance table and by combining a conservation law; And judging whether the balance difference exceeds a preset threshold, if so, backtracking and checking data, and correcting, and if not, indicating that the data quality is good, and finishing the integration process.
6. The method for calculating the carbon footprint of a granulated blast furnace slag powder product according to claim 1, wherein the calculation expression of the total carbon footprint is: , Wherein: , ), In the formula, As a result of the overall carbon footprint, As the total amount of electric power to be discharged, Is the total amount of fossil energy combustion emission, In order to integrate the coefficient of the electric power discharge, In order to outsource the electric quantity of the power grid, Is the self-generated electricity quantity in the steel mill, In order to recover the energy of the energy, Is fossil energy Is used for controlling the combustion emission amount of the fuel, Is fossil energy Is used for the activity data of the (a), Is fossil energy Is used for the low-order calorific value of (a), Is fossil energy Is characterized by comprising carbon content per unit heat value, Is fossil energy Is characterized by the carbon oxidation rate of (a), Is the ratio of the relative molecular masses of carbon dioxide and carbon.
7. The method for calculating the carbon footprint of a granulated blast furnace slag powder product according to claim 6, wherein the calculation expression of the electric power average emission factor is: , In the formula, 、、 The power discharge coefficients of the power grid electricity, the self-power generation in the steel mill and the power generation of the residual heat and the residual pressure are respectively, To produce the relevant total power consumption.
8. A method of carbon footprint accounting for granulated blast furnace slag powder products as claimed in claim 1, wherein said step of obtaining a distribution result of the symbiotic product comprises: for different grades of symbiotic products generated on the granulated blast furnace slag powder production line, judging whether each symbiotic product can directly adopt the first priority to carry out carbon footprint allocation, If yes, dividing the A3 stage in the system boundary into a plurality of sub-processes, respectively collecting the input and output data of each sub-process, realizing direct attribution distribution, If not, further judging whether the carbon footprint allocation can be carried out by adopting the second priority, if so, allocating according to the average delivery price of the symbiotic product in recent years, If not, the ratio of the economic value to the total income is smaller than the set value or no market transaction, and the economic value belongs to the third priority, and at the moment, the carbon footprint is directly marked as 0 without distribution.
9. The method for calculating the carbon footprint of a granulated blast furnace slag product according to claim 1, wherein the calculation expression of the carbon footprint of the granulated blast furnace slag product is: , In the formula, To pelletize the carbon footprint of the blast furnace slag powder product, As a result of the overall carbon footprint, Is a carbon footprint assigned to all symbiotic products.
10. The method for carbon footprint accounting of granulated blast furnace slag powder product according to claim 1, further comprising a symbiotic product distribution engagement process with an upstream steel industry, in particular comprising: Regarding blast furnace slag on a granulated blast furnace slag powder production line, according to the distribution coefficient, when the blast furnace slag powder enters into the production of the granulated blast furnace slag powder, environmental load is not carried in, namely, carbon footprint accounting is not calculated; and calculating the environmental load of the gas on the granulated blast furnace slag powder production line, namely accounting the carbon footprint, by substituting the gas into the granulated blast furnace slag powder production line.

Description

Carbon footprint accounting method for granulated blast furnace slag powder product Technical Field The invention relates to the field of carbon emission reduction, in particular to a carbon footprint accounting method of granulated blast furnace slag powder products. Background With the global high emphasis on carbon emission reduction and green low-carbon development, product carbon footprint accounting has become an important tool for measuring the sustainable development capability of industry. In the steel industry, although a relatively perfect carbon footprint accounting system is established, the system is mainly focused on life cycle evaluation (LCA) of main products such as coarse steel, steel and the like, and for processed products downstream of a steel industry chain such as granulated blast furnace slag powder (Granulated Ground Blast Furnace Slag, GGBS), the carbon footprint accounting is still in an exploration stage, and a unified, scientific and generalized distribution method system is not formed yet. Currently, internationally common lifecycle evaluation criteria such as ISO 14040/14044, ISO 14025, and european building product core rule EN 15804, etc., while providing framework guidance for Environmental Product Declaration (EPD) of building materials, the following prominent problems are faced when applied specifically to symbiotic products derived from steel smelting processes such as GGBS: 1. The data collection standard is not uniform, because slag micropowder belongs to the processing industry, the slag micropowder relates to the use of various upstream raw materials and secondary energy sources in the production process, the data sources are various, primary data and secondary data are mixed, the systematic requirement on the data quality is lacking, and the accuracy and the credibility of the accounting result are affected. 2. The distribution method is not clear, and the existing accounting system is lack of a refined distribution rule for the joint of the symbiotic products in different systems in the production process of GGBS (gas-slag) and the like, which is often accompanied with the symbiotic products from the upstream steel industry, so that the accounting results of different enterprises are obviously different, and the comparability is lacking. 3. The system boundary is fuzzy, a part of accounting models do not fully consider the specific 'from cradle to gate' production path of GGBS, and key links such as transportation, energy conversion and the like are omitted, so that emission sources are omitted or calculated repeatedly. 4. The international mutual recognition is insufficient, the existing accounting method is not smoothly connected with the international PCR (product type rule), the compliance requirement of overseas clients and green building certification on carbon footprint data is difficult to meet, and the product export competitiveness is restricted. In view of the foregoing, there is a need to establish a set of scientific, standard, and international standard compatible environmental impact accounting and distribution methods for granulated blast furnace slag powder production, and especially to realize breakthrough in the aspects of symbiotic product environmental load distribution, data quality control, system boundary definition, etc., so as to support green transformation and international low-carbon trade competition of the mineral powder processing industry in the iron and steel industry chain. Disclosure of Invention The invention aims to provide a method for accurately calculating the carbon footprint of a granulated blast furnace slag powder product. The aim of the invention can be achieved by the following technical scheme: A method of carbon footprint accounting for granulated blast furnace slag powder products, comprising the steps of: Determining a system boundary for carbon footprint accounting according to internationally universal life cycle evaluation criteria; Acquiring primary data and secondary data according to the determined system boundary; Integrating the primary data and the secondary data, and accounting the total carbon footprint in the boundary of the whole system; adopting a layered progressive distribution strategy to distribute symbiotic products of the granulated blast furnace slag powder to obtain a distribution result of the symbiotic products; and obtaining the carbon footprint of the granulated blast furnace slag powder product based on the total carbon footprint and the distribution result of the symbiotic product. Further, the system boundary of the carbon footprint accounting is an A1-A3 product stage, wherein the A1 stage is an upstream production stage, the A2 stage is a transportation stage, and the A3 stage is a core production and manufacturing stage. Further, the primary data is obtained from the A3 stage, the primary data comprising: Energy data including yield and heat value of outsourced power structure, bla