A method for calculating carbon emissions from sintering process

Abstract

The present invention discloses a method for calculating carbon emissions from a sintering process. Based on the physical and chemical reaction between Fe-O-C in the sintering process, the energy and carbonaceous element consumption data and the residual energy and waste heat recovery and utilization data in the sintering process are analyzed by adding the return ore. An oxygen migration coordinate system is constructed through the migration and change of oxygen and carbon elements, and an oxygen migration line diagram of the sintering process is drawn in the oxygen migration coordinate system. The carbon emission K of a unit of qualified sintered ore produced in the sintering process and the carbon emission K of the sintering process when producing a qualified ton of iron products are calculated according to the oxygen migration line diagram. o The calculation method of the present invention can clarify the carbon emission composition in the sintering process, analyze the carbon emission potential, and provide a reasonable and highly executable carbon emission optimization plan, which has important guiding significance for optimizing the energy consumption of the sintering process of steel enterprises and reducing carbon emissions. At the same time, the sintering process is linked to the entire steel production process, which is convenient for the economic accounting of steel enterprises.

Description

Technical Field

[0001] The invention relates to the technical field of iron and steel metallurgy, and in particular to a method for calculating carbon emissions from a sintering process. Background Art

[0002] Previous researchers have done a lot of research and summary on the calculation and analysis of carbon emissions from steel companies. Their work mainly focuses on collecting greenhouse gas emissions from steel companies per unit of product through statistical methods, and then combining surveys, actual measurements or material balance calculations to obtain the proportion of each process in the total emissions. These works are important references for understanding the carbon emissions of steel companies and summarizing the key links of carbon emissions in steel companies, but they are rarely combined with the specific reactions that occur in each process of steel production to analyze carbon emissions, which is not conducive to providing specific solutions to reduce carbon emissions.

[0003] In the prior art, a master's thesis entitled "Research on Energy Saving and Consumption Reduction of No. 1 Blast Furnace in a Steel Plant" published in 2007 constructed an operation line chart of the blast furnace process, analyzed the potential for reducing the fuel ratio, studied the impact of different factors on the fuel ratio, and regressed the impact relationship model of different factors on the comprehensive coke ratio. However, this calculation method cannot analyze the carbon consumption caused by the electric energy consumed by the blast furnace process and the impact of waste energy and waste heat recovery, purchased clean energy, etc. on carbon consumption. The calculation result only represents the fuel ratio of the blast furnace process rather than the carbon emissions. The carbon-containing flux added in the sintering process will decompose and produce CO2 during the sintering process, and the above calculation method cannot analyze the carbon emissions generated by the added flux. In addition, the calculation method only considers the iron oxide content of the iron ore in the raw materials of the blast furnace process when calculating the coordinates of point A. However, for the sintering process, both the raw materials and the products have iron oxides. Therefore, the calculation of the vertical coordinate of point A does not match the actual sintering process. The analysis results fail to reflect the actual carbon consumption and cannot provide strong support for optimizing carbon emissions.

[0004] In view of this, it is necessary to design a method to calculate carbon emissions from the sintering process to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to provide a method for calculating carbon emissions in a sintering process. Based on the physical and chemical reaction between Fe-OC in the sintering process, the data on the waste of energy and carbon elements in the sintering process due to the addition of returned ore and the data on the recovery and utilization of surplus energy and waste heat are analyzed. According to the migration and change of oxygen and carbon elements in the sintering process, an oxygen migration line diagram is established, thereby calculating the carbon emission K of a unit of qualified sintered ore produced in the sintering process, and the carbon emission K of the sintering process when producing a unit of qualified iron products. oBased on the oxygen migration line, the composition of carbon emissions in the sintering process can be clarified, the carbon emission potential of the sintering process can be analyzed, and a reasonable and highly executable carbon emission optimization plan can be given, which has important guiding significance for reducing carbon emissions in the sintering process. At the same time, the sintering process is linked to the entire steel production process, which is convenient for the economic accounting of steel companies.

[0006] In order to achieve the above-mentioned purpose of the invention, the present invention provides a method for calculating carbon emissions in a sintering process. Based on the physical and chemical reaction between Fe-OC in the sintering process, the migration and change data of oxygen and carbon elements are collected, an oxygen migration coordinate system of the sintering process is constructed, and an oxygen migration line diagram of the sintering process is drawn in the oxygen migration coordinate system. According to the oxygen migration line diagram, the carbon emission K of a unit of qualified sintered ore produced in the sintering process and the carbon emission K of the sintering process when producing a qualified ton of iron products are calculated. o Among them, the migration and change data of oxygen and carbon elements include the analysis data of energy and carbon element consumption in the sintering process caused by returned ore and the analysis data of waste energy and waste heat recovery.

[0007] As a further improvement of the present invention, based on the oxygen migration line diagram, the effects of sintering process parameter optimization, purchased clean electricity, and waste energy and waste heat recovery on the oxygen migration line and carbon emissions K are analyzed, so as to evaluate the process parameters of the sintering process and guide the selection of the optimal process parameters of the sintering process with the lowest carbon emissions for process optimization.

[0008] As a further improvement of the present invention, the method for calculating carbon emissions in the sintering process comprises the following steps:

[0009] In step S1, before collecting the migration and change data of oxygen and carbon elements in the sintering process, the change path of the oxygen in the iron oxides of Fe2O3 and Fe3O4 and the oxygen in the air during the exhaust sintering process to the oxygen in CO and CO2 in the sintering flue gas is clarified, and the change path of the carbon element in the sintering process when CO in the ignition gas and C in the carbon-containing fuel combine with oxygen to produce CO2 and CO is clarified;

[0010] In step S2, the oxygen migration line is constructed by plotting the migration and change process of oxygen and carbon in the sintering process in a rectangular coordinate system, wherein the abscissa represents the number of oxygen atoms bonded to each carbon atom in the sintering process, and the ordinate represents the amount of oxygen bonded to each iron atom migrated to the carbon atom in the sintering process, thereby constructing the oxygen migration coordinate system of the sintering process;

[0011] The oxygen migration line diagram is drawn by analyzing the process of oxygen migration from iron oxide to carbon oxide in the sintering process, and the migration amount is expressed as the horizontal coordinate X at point A. AIndicates that the migration process of oxygen elements combined with iron elements in the sintering process is analyzed, and the amount of migration is expressed as the ordinate Y of point A. A and the ordinate Y of point E E It means that the horizontal coordinate of point E is defined as 0; point A and point E are plotted in the oxygen migration coordinate system established in step S2 according to their coordinates, and points A and E are connected to draw the oxygen migration line diagram of the sintering process.

[0012] As a further improvement of the present invention, in step S1, the migration and change data of the oxygen element in the sintering process include the source data of oxygen, specifically including the amount of oxygen brought in by the oxidation and reduction of the iron element, the amount of oxygen brought in by the combustion of coal gas during the ignition process, the amount of oxygen brought in by the combustion of carbon-containing fuel in the sintering process, the amount of oxygen brought in by the carbon-containing flux, the amount of oxygen brought in by the oxidation and reduction of the sintering return ore, and the amount of oxygen brought in from the air when producing the electricity consumed in the sintering process; in addition, the migration and change data of the oxygen element in the sintering process also include the migration data of oxygen, specifically including the CO and CO2 content in the sintering flue gas, the CO2 content generated by the electric energy consumed in the sintering process, and the amount of coal gas required to produce a unit of sintered ore; the data of the sintering process include the TFe content, Fe2O3 content, and Fe3O4 content in the iron ore; the sintered ore output; the TFe content, Fe2O3 content, and Fe3O4 content in the finished sintered ore; the qualified sintered ore output, the sintered ore finished product rate, and the carbon content of the carbon-containing fuel.

[0013] As a further improvement of the present invention, the amount of oxygen element migration in each link of the sintering process refers to the amount of substances consumed in each link of the sintering process converted into the consumption per unit of finished sintered ore.

[0014] As a further improvement of the present invention, the horizontal coordinate X of point A A and the ordinate Y A The calculation formula is as follows:

[0015]

[0016] Where: x i is the carbon-containing flue gas brought into the sintering flue gas by the decomposition of carbon-containing flux, in mol; x h is the carbon-containing flue gas brought into the sintering flue gas by the combustion of carbon-containing fuel, in mol; x g is the carbon-containing flue gas brought into the sintering flue gas by the combustion of the ignition gas, in mol; x j is the carbon-containing flue gas brought into the sintering flue gas by combustion power generation, in mol; x1 is the mass percentage of completely burned carbon in the solid fuel, in %;

[0017] The carbon-containing flue gas x brought in by the decomposition of the carbon-containing flux i The calculation formula is as follows:

[0018]

[0019] Among them: U fs The consumption of carbon flux per unit mass of sintered ore produced, in kg / t; is the mass percentage of calcium carbonate in the flux, in %; β is the decomposition rate of CaCO3, in %;

[0020] The carbon-containing flue gas x brought in by the combustion of the carbon-containing fuel h The calculation formula is as follows:

[0021]

[0022] Among them: U rs P is the solid fuel consumption per unit mass of sintered ore produced, in kg / t; c is the mass percentage of carbon element in solid fuel pulverized coal, in %;

[0023] The carbon-containing flue gas x brought in by combustion and power generation in the sintering process j The calculation formula is as follows:

[0024]

[0025] Among them: U ES is the amount of electricity required to produce a unit mass of sintered ore, in kWh / t; k is the molar amount of carbon consumed per kilowatt-hour of electricity produced, in mol / kWh;

[0026] The carbon-containing flue gas x brought in by the combustion of the ignition gas g The calculation formula is as follows:

[0027]

[0028] Where: V is It is the amount of gas consumed in producing unit mass of sintered ore during the ignition process, in m3 / t; is the percentage of CO in the consumed ignition gas, in %;

[0029]

[0030] Where: w(Fe2O3) O Indicates the Fe2O3 content in iron ore; w(FeO) O Indicates the FeO content in iron ore; w(TFe) O Indicates the TFe content in iron ore; w(Fe2O3) S Indicates the Fe2O3 content in the finished sintered ore; w(FeO)S Indicates the FeO content in the finished sintered ore; w(TFe) S Indicates the TFe content in the finished sintered ore.

[0031] As a further improvement of the present invention, the X A In the calculation formula, the mass percentage of carbon in completely burned solid fuel is represented by x1, and the mass percentage of carbon in incompletely burned solid fuel is represented by x2. The calculation formulas of x1 and x2 are as follows:

[0032]

[0033] in: is the percentage of CO in sintering flue gas, in %; is the percentage of CO2 in sintering flue gas, in %; is the percentage of CO2 in the consumed ignition gas, in %; It is the percentage of CO in the consumed ignition gas, in %.

[0034] As a further improvement of the present invention, the horizontal coordinate Y of point E E The calculation formula is as follows:

[0035] Y E =-(y g +y h +y i +y j +y k )

[0036] Where: y g It is the amount of oxygen brought in by the combustion of coal gas during the ignition process in the sintering process; h The amount of oxygen introduced by the combustion of carbon-containing fuel during the sintering process; i is the amount of oxygen brought into the sintering process by the carbon-containing flux; k The amount of oxygen brought in by the oxidation and reduction of the sintered ore during the sintering process; j The amount of oxygen brought in from the air to produce the electricity consumed in the sintering process;

[0037] The amount of oxygen introduced by the combustion of coal gas during the ignition process in the sintering process is g The calculation formula is as follows:

[0038]

[0039] Where: n(Fe) is the amount of iron element, in mol; m is the output of qualified sintered ore, in kg; is the yield rate of sintered ore, in %;

[0040] The amount of oxygen introduced by the combustion of carbon-containing fuel in the sintering process is h The calculation formula is as follows:

[0041]

[0042] The amount of oxygen introduced by the carbon-containing flux in the sintering process is i The calculation formula is as follows:

[0043]

[0044] The amount of oxygen brought in by the oxidation and reduction of the sintered ore during the sintering process is k The calculation formula is as follows:

[0045]

[0046] Most of the electricity consumed in the sintering process is obtained by the heat released by the combination of C and O during thermal power generation. Therefore, the electricity consumed in the sintering process at point E in the ordinate is the amount of oxygen brought in by the air. j The calculation formula is as follows:

[0047]

[0048] As a further improvement of the present invention, the carbon emissions generated by the production unit of qualified sintered ore in the sintering process are represented by K value, and the calculation formula of K is as follows:

[0049]

[0050] Furthermore, the flow of iron in the long production process of steel enterprises was studied, and the carbon emissions of the sintering process when producing qualified tons of iron products were analyzed using K o Indicates that K o The calculation formula is as follows:

[0051]

[0052] As a further improvement of the present invention, the waste energy and waste heat recovery is to use the waste energy and waste heat to generate electricity in the steel enterprise, thereby replacing the electricity generated by carbon combustion to reduce carbon emissions. The whole process does not involve the reduction of iron oxides. At this time, the ordinate of point A in the oxygen migration line of the sintering process remains unchanged:

[0053]

[0054] Where: Y′ A It indicates the amount of oxygen element migration combined with iron element in the sintering process after the waste energy and waste heat are recovered;

[0055] In the waste energy and waste heat recovery process, CO in the sintering flue gas is converted into CO2. At this time, the calculation formula of the horizontal coordinate of point A in the oxygen migration line of the sintering process is as follows:

[0056]

[0057] Where: θ is the waste energy and waste heat recovery rate, in %; X′ A It indicates the amount of oxygen element migration from iron oxide to carbon oxide in the sintering process after the waste energy and waste heat are recovered;

[0058] In the waste energy and waste heat recovery process, the combustion of coal gas will bring in oxygen from the air, so the vertical coordinate calculation formula of point E is as follows:

[0059]

[0060] Where: Y′ E It indicates the amount of oxygen element migration combined with iron element in the sintering process after the waste energy and waste heat are recovered; The amount of CO2 generated by recycling CO in the sintering process to produce qualified steel products;

[0061] The carbon emission of the waste energy and waste heat recovery is K (余能余热回收) The calculation formula is as follows:

[0062]

[0063] The beneficial effects of the present invention are:

[0064] 1. The present invention establishes a calculation method for carbon emissions in the sintering process by combining the migration and changes of the three elements Fe-OC. It can clearly show the consumption of carbon in the sintering process in the form of oxygen migration lines, and provides a new calculation method for analyzing carbon emissions in the sintering process.

[0065] 2. The present invention can clearly visualize the various processes of the sintering process through the constructed oxygen migration line, and construct a carbon emission calculation formula for the sintering process unit qualified sintered ore based on the carbon emissions generated in each process. In addition, a carbon emission calculation formula for the sintering process unit pig iron is also constructed, which links the sintering process with the entire steel production process. By analyzing the carbon emissions of the sintering process based on iron, the economic accounting of steel companies is facilitated.

[0066] 3. The present invention adds the loss of material and energy caused by ore return in the sintering process to the oxygen migration process of the sintering process. By establishing the oxygen migration line of the sintering process, the energy wasted by ore return is fully taken into account in each process of the sintering process, and the carbon emission calculation method of the sintering process is optimized; at the same time, the ore return is closely linked to the yield rate. According to the calculation method of the present invention, the yield rate control critical value can be obtained to minimize carbon emissions, avoid increasing the amount of ore return due to low yield, thereby avoiding increased waste of material, energy and supporting facilities in the sintering process, as well as increased carbon emissions due to increased investment in early materials, energy and supporting facilities to improve the yield rate.

[0067] 4. The present invention adds the electric energy consumed by the supporting facilities in the sintering process and the recovery of the surplus energy and waste heat into the oxygen migration process, which expands the oxygen migration process of the sintering process and improves the carbon emission process of the sintering process. Based on this oxygen migration line, the composition of carbon emissions in the sintering process can be clarified, the carbon emission potential of the sintering process can be analyzed, and a reasonable and highly executable carbon emission optimization plan can be given;

[0068] 5. The present invention provides a calculation and analysis method that is simple, easy to obtain data, visualized in calculation results, and has a highly executable carbon emission optimization solution. It has important guiding significance for optimizing the energy consumption of the sintering process of steel enterprises and reducing the carbon emissions of the sintering process. BRIEF DESCRIPTION OF THE DRAWINGS

[0069] Figure 1 This is the design idea diagram of the oxygen migration line diagram for the sintering process.

[0070] Figure 2 This is the oxygen migration line diagram of the sintering process.

[0071] Figure 3 It is the oxygen migration coordinate system of the sintering process in the embodiment.

[0072] Figure 4 It is the oxygen migration line diagram of the sintering process in the embodiment.

[0073] Figure 5 This is the oxygen migration line diagram before and after sintering process optimization.

[0074] Figure 6 Oxygen migration diagram when considering the recovery of waste energy and waste heat in the sintering process. DETAILED DESCRIPTION

[0075] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0076] It should also be noted that, in order to avoid obscuring the present invention due to unnecessary details, only structures and / or processing steps closely related to the scheme of the present invention are shown in the drawings, while other details that are not closely related to the present invention are omitted.

[0077] In addition, it should be noted that the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0078] The present invention provides a method for calculating carbon emissions in a sintering process. Based on the physical and chemical reaction between Fe-OC in the sintering process, the migration and change data of oxygen and carbon elements are collected, an oxygen migration coordinate system of the sintering process is constructed, and an oxygen migration line diagram of the sintering process is drawn in the oxygen migration coordinate system. The carbon emission K of a unit of qualified sintered ore produced in the sintering process and the carbon emission K of the sintering process when producing a qualified ton of iron products are calculated according to the oxygen migration line diagram. ο Among them, the migration and change data of oxygen and carbon elements include the analysis data of energy and carbon element consumption in the sintering process caused by returned ore and the analysis data of waste energy and waste heat recovery.

[0079] Specifically, according to the oxygen migration line diagram, the effects of sintering process parameter optimization, purchased clean electricity, and waste energy and waste heat recovery on the oxygen migration line and carbon emissions K are analyzed, so as to evaluate the process parameters of the sintering process, and guide the selection of the optimal process parameters of the sintering process with the lowest carbon emissions for process optimization; the sintering process parameter optimization includes the optimization of the consumption of carbon-containing flux, the amount of carbonaceous fuel in the sintering process, the power consumption of the sintering process, etc.

[0080] Specifically, the calculation method of carbon emissions from the sintering process includes the following steps:

[0081] S1. Clarify the change path of the oxygen element in the sintering process, including the oxygen in the iron oxides of Fe2O3 and Fe3O4, and the oxygen in the air during the exhaust sintering process, which migrates to the oxygen in CO and CO2 in the sintering flue gas; the change path of the carbon element in the sintering process, including the CO in the ignition gas and the C in the carbon-containing fuel when they combine with oxygen to produce CO2 and CO; collect the data on the migration and change of oxygen and carbon elements during the sintering process; the migration and change data of the oxygen element in the sintering process include the source data of oxygen, specifically including the amount of oxygen brought in by the oxidation and reduction of the iron element, the amount of oxygen brought in by the combustion of the coal gas during the ignition process, and the amount of oxygen brought in by the combustion of the carbon-containing fuel in the sintering process. The amount of oxygen brought in by carbon-containing flux, the amount of oxygen brought in by oxidation and reduction of sintered return ore, and the amount of oxygen brought in from the air when the electricity consumed in the sintering process is produced; in addition, the migration and change data of oxygen elements in the sintering process also include oxygen migration data, specifically including the CO and CO2 content in the sintering flue gas, the CO2 content generated by the electricity consumed in the sintering process, and the amount of coal gas required to produce a unit of sintered ore; the data of the sintering process include the TFe content, Fe2O3 content, and Fe3O4 content in the iron ore; the output of sintered ore; the TFe content, Fe2O3 content, and Fe3O4 content in the finished sintered ore; the output of qualified sintered ore, the yield of sintered ore, and the carbon content of carbon-containing fuels;

[0082] S2: Plotting the migration and change process of oxygen and carbon in the sintering process in a rectangular coordinate system, wherein the abscissa represents the number of oxygen atoms bonded to each carbon atom in the sintering process, and the ordinate represents the amount of oxygen bonded to each iron atom migrated to the carbon atom in the sintering process, thereby constructing an oxygen migration coordinate system for the sintering process;

[0083] S3: Analyze the process of oxygen element migration from iron oxide to carbon oxide in the sintering process, and use the horizontal coordinate X at point A to calculate the amount of migration. A Indicates that the migration process of oxygen elements combined with iron elements in the sintering process is analyzed, and the amount of migration is expressed as the ordinate Y of point A. A and the ordinate Y of point E E It means that the horizontal coordinate of point E is defined as 0;

[0084] S4: Plot the migration and change of the oxygen element in the sintering process calculated in step S3 in the oxygen migration coordinate system established in S2, and connect points A and E to draw the oxygen migration line diagram of the sintering process. The carbon emission K of the qualified sintered ore produced by the production unit in the sintering process is calculated through the oxygen migration line diagram.

[0085] Specifically, the amount of oxygen element migration in each link of the sintering process refers to the amount of substances consumed in each link of the sintering process converted into the consumption per unit of finished sintered ore.

[0086] Specifically, the horizontal coordinate X of point A A and the ordinate Y A The calculation formula is as follows:

[0087]

[0088] Where: x i is the carbon-containing flue gas brought into the sintering flue gas by the decomposition of carbon-containing flux, in mol; x h is the carbon-containing flue gas brought into the sintering flue gas by the combustion of carbon-containing fuel, in mol; x g is the carbon-containing flue gas brought into the sintering flue gas by the combustion of the ignition gas, in mol; x j is the carbon-containing flue gas brought into the sintering flue gas by combustion power generation, in mol; x1 is the mass percentage of completely burned carbon in the solid fuel, in %;

[0089] Compared with the traditional operation line for calculating the coke ratio, the flue gas in the sintering process includes not only the flue gas generated by the combustion of coal gas, the combustion of carbon-containing fuels, and the decomposition of carbon-containing flux in the sintering process, but also the flue gas from thermal power generation and coal gas. Therefore, when calculating point A, in addition to the carbon-oxygen ratio analysis of the sintering process itself, the carbon-oxygen ratio brought in by thermal power generation and coal gas through material balance is also analyzed. Compared with the conventional calculation method, the calculation method of the present invention not only analyzes the changes in the carbon-containing flue gas in the sintering flue gas, but also fully analyzes the carbon consumption outside the sintering process, so that the calculation results can more truly reflect the actual carbon emissions;

[0090] Carbon-containing flue gas introduced by decomposition of carbon-containing flux x i The calculation formula is as follows:

[0091]

[0092] Among them: U fs The consumption of carbon flux per unit mass of sintered ore produced, in kg / t; is the mass percentage of calcium carbonate in the flux, in %; β is the decomposition rate of CaCO3, in %;

[0093] Carbon-containing flue gas introduced by the combustion of carbon-containing fuel x h The calculation formula is as follows:

[0094]

[0095] Among them: U rs P is the solid fuel consumption per unit mass of sintered ore produced, in kg / t; c is the mass percentage of carbon element in solid fuel pulverized coal, in %;

[0096] Carbon-containing flue gas introduced by combustion and power generation during the sintering process j The calculation formula is as follows:

[0097]

[0098] Among them: U ES is the amount of electricity required to produce a unit mass of sintered ore, in kWh / t; k is the molar amount of carbon consumed per kilowatt-hour of electricity produced, in mol / kWh;

[0099] Carbon-containing flue gas brought in by the combustion of ignition gas x g The calculation formula is as follows:

[0100]

[0101] Where: V is The amount of gas consumed in the production of unit mass of sintered ore during the ignition process, in m 3 / t; is the percentage of CO in the consumed ignition gas, in %;

[0102] By splitting and analyzing the composition of the carbon-containing flue gas brought into each link of the sintering process, the emission of carbon-containing flue gas in each link can be calculated more clearly, and the calculation process is simple and accurate;

[0103]

[0104] Where: w(Fe2O3) O Indicates the Fe2O3 content in iron ore; w(FeO) O Indicates the FeO content in iron ore; w(TFe) O Indicates the TFe content in iron ore; w(Fe2O3) S Indicates the Fe2O3 content in the finished sintered ore; w(FeO) S Indicates the FeO content in the finished sintered ore; w(TFe) S Indicates the TFe content in the finished sintered ore.

[0105] Specifically, X A In the calculation formula, the mass percentage of carbon in completely burned solid fuel is represented by x1, and the mass percentage of carbon in incompletely burned solid fuel is represented by x2. The calculation formulas of x1 and x2 are as follows:

[0106]

[0107] in: is the percentage of CO in sintering flue gas, in %; is the percentage of CO2 in sintering flue gas, in %; is the percentage of CO2 in the consumed ignition gas, in %; It is the percentage of CO in the consumed ignition gas, in %.

[0108] Specifically, the horizontal coordinate Y of point E E The calculation formula is as follows:

[0109] Y E =-(y g +y h +y i +y j +y k )

[0110] Where: y g It is the amount of oxygen brought in by the combustion of coal gas during the ignition process in the sintering process; h The amount of oxygen introduced by the combustion of carbon-containing fuel during the sintering process; i is the amount of oxygen brought into the sintering process by the carbon-containing flux; k The amount of oxygen brought in by the oxidation and reduction of the sintered ore during the sintering process; j The amount of oxygen brought in from the air to produce the electricity consumed in the sintering process;

[0111] The amount of oxygen introduced by the combustion of coal gas during the ignition process in the sintering process g The calculation formula is as follows:

[0112]

[0113] Where: n(Fe) is the amount of iron element, in mol; m is the output of qualified sintered ore, in kg; is the yield rate of sintered ore, in %;

[0114] By g The calculation formula shows that the amount of oxygen brought into the combustion of ignition gas is related to the volume of gas and the amount of CO it contains. This formula can be used to compare the effects of different gas ratios on y g The influence of gas volume can provide a theoretical basis for selecting the optimal gas volume.

[0115] The amount of oxygen introduced by the combustion of carbon-containing fuel during the sintering process h The calculation formula is as follows:

[0116]

[0117] By hIt can be seen from the calculation that the amount of oxygen brought into the combustion of carbon-containing fuel is related to the complete fuel ratio and carbon content of the carbon-containing fuel. According to this formula, the appropriate carbon-containing fuel can be selected and the complete fuel ratio of the carbon-containing fuel can be optimized, thus providing a theoretical basis for optimizing carbon emissions in the sintering process.

[0118] The amount of oxygen introduced by the carbon-containing flux during the sintering process i The calculation formula is as follows:

[0119]

[0120] The yield of sintered ore obtained in the sintering process is limited, and part of the sintered return ore is not used, but the iron oxide contained in it participates in the redox reaction and brings in oxygen. The amount of oxygen brought in by the redox reaction of the sintered return ore in the sintering process is y k The calculation formula is as follows:

[0121]

[0122] Most of the electricity consumed in the sintering process is obtained by the heat released by the combination of C and O during thermal power generation. Therefore, the electricity consumed in the sintering process at point E in the ordinate is the amount of oxygen brought in by the air. j The calculation formula is as follows:

[0123]

[0124] The calculation of point E takes into account the impact of the yield rate in the sintering process on the carbon emissions of the finished sintered ore. The yield rate of the sintering process determines the proportion of returned ore. The returned ore also participates in the redox reaction during the sintering process. This part of energy does not ultimately enter the finished sintered ore, resulting in energy waste. The conventional calculation method only takes into account the waste of surplus energy and waste heat caused by returned ore. The calculation method of the present invention fully considers the impact of returned ore on carbon emissions in the entire sintering process.

[0125] Specifically, the carbon emissions generated by the production of qualified sintered ore in the sintering process are expressed by the K value. The K value can be calculated from the migration of oxygen in each link of the sintering process. The calculation formula of K is as follows:

[0126]

[0127] Furthermore, the flow of iron in the long production process of steel enterprises was studied, and the carbon emissions of the sintering process when producing qualified tons of iron products were analyzed using K o Indicates that K o The calculation formula is as follows:

[0128]

[0129] Specifically, the recycling of waste energy and waste heat is to use the waste energy and waste heat to generate electricity in steel enterprises, thereby replacing the electricity generated by carbon combustion to reduce carbon emissions. The whole process does not involve the reduction of iron oxides. At this time, the vertical coordinate of point A in the oxygen migration line of the sintering process remains unchanged:

[0130]

[0131] Where: Y′ A It indicates the amount of oxygen element migration combined with iron element in the sintering process after the waste energy and waste heat are recovered;

[0132] In the waste energy and waste heat recovery process, CO in the sintering flue gas is converted into CO2. At this time, the calculation formula of the horizontal coordinate of point A in the oxygen migration line of the sintering process is as follows:

[0133]

[0134] Where: θ is the waste energy and waste heat recovery rate, in %; X′ A It indicates the amount of oxygen element migration from iron oxide to carbon oxide in the sintering process after the waste energy and waste heat are recovered;

[0135] In the waste energy and waste heat recovery process, the combustion of coal gas will bring in oxygen from the air, so the vertical coordinate calculation formula of point E is as follows:

[0136]

[0137] Where: Y′ E It indicates the amount of oxygen element migration combined with iron element in the sintering process after the waste energy and waste heat are recovered; The amount of CO2 generated by recycling CO in the sintering process to produce qualified steel products;

[0138] The carbon emission of the waste energy and waste heat recovery is K (余能余热回收) The calculation formula is as follows:

[0139]

[0140] The calculation method of carbon emission in the sintering process provided by the present invention is described below with reference to the examples.

[0141] The present invention is a method for calculating carbon emissions in a sintering process, which specifically comprises the following steps:

[0142] S1. Clarify the change path of the O element in the sintering process, including the oxygen in the iron oxides of Fe2O3 and Fe3O4, and the oxygen in the air during the exhaust sintering process, which migrates to the oxygen in CO and CO2 in the sintering flue gas; the change path of the C element in the sintering process, including the CO in the ignition gas and the C in the carbon-containing fuel when combining with oxygen to produce CO2 and CO; collect data on the migration and change of oxygen and carbon elements during the sintering process; the collected data are shown in Tables 1 to 5.

[0143] Table 1 Iron content of sintering raw materials and sintered ore finished products in sintering process of sintering plant (%)

[0144]

[0145] Table 2 Main production indicators and consumption before and after optimization of sintering process in sintering plant

[0146]

[0147]

[0148] Table 3 shows the gas composition (%) used before and after the sintering process optimization in the sintering plant

[0149]

[0150] Table 4 shows the carbon-containing gas composition (%) in the flue gas before and after the sintering process optimization of the sintering plant

[0151]

[0152] Table 5 shows the sintered ore yield rate (%) before and after the sintering process optimization of the sintering plant

[0153]

[0154] S2, the migration and change process of oxygen and carbon in the sintering process is plotted in a rectangular coordinate system, the horizontal axis represents the number of oxygen atoms combined with each carbon atom in the sintering process, and the vertical axis represents the amount of oxygen combined with each iron atom migrated to the carbon atom in the sintering process, and the oxygen migration coordinate system of the sintering process is constructed; the drawn oxygen migration coordinate system of the sintering process is as follows Figure 3 shown.

[0155] S3: Analyze the process of oxygen element migration from iron oxide to carbon oxide in the sintering process, and use the horizontal coordinate X at point A to calculate the amount of migration. A Indicates that the migration process of oxygen elements combined with iron elements in the sintering process is analyzed, and the amount of migration is expressed as the ordinate Y of point A. A and the ordinate Y of point E E Indicates that the horizontal coordinate of point E is defined as 0; the specific process is as follows:

[0156] S31: Before optimization, the carbon-containing flue gas x brought in by the decomposition of the carbon-containing flux i(优化前) The calculation formula is as follows:

[0157]

[0158] After optimization, the carbon-containing flue gas x brought in by the decomposition of the carbon-containing flux i(优化后) The calculation formula is as follows:

[0159]

[0160] S32: Before optimization, the carbon-containing flue gas x brought in by the combustion of the carbon-containing fuel h(优化前) The calculation formula is as follows:

[0161]

[0162] After optimization, the carbon-containing flue gas x brought in by the combustion of the carbon-containing fuel h(优化后) The calculation formula is as follows:

[0163]

[0164] S33: Before optimization, the sintering process consumes electricity to burn the carbon-containing flue gas brought in by power generation x j(优化前) The calculation formula is as follows:

[0165]

[0166] After optimization, the sintering process consumes electricity to burn the carbon-containing flue gas brought in by power generation x j(优化后) The calculation formula is as follows:

[0167]

[0168] S34: Carbon-containing flue gas x introduced by the combustion of the ignition gas in the sintering process g The calculation formula is as follows:

[0169]

[0170] S35: Before optimization, x 1(优化前) and x 2(优化前) The calculation formula is as follows:

[0171]

[0172] Right now:

[0173]

[0174] Right now:

[0175]

[0176] Right now:

[0177]

[0178] After optimization, x 1(优化后) and x 2(优化后) The calculation formula is as follows:

[0179]

[0180] Right now:

[0181]

[0182] Right now:

[0183]

[0184] Right now:

[0185]

[0186] S36: Before optimization, the horizontal coordinate of point A is X A(优化前) The calculation process is as follows:

[0187]

[0188] After optimization, the horizontal coordinate X of point A A(优化后) The calculation process is as follows:

[0189]

[0190] S37: The amount of oxygen Y brought into the sintered ore by oxidation and reduction of the iron oxide A The calculation formula is as follows:

[0191]

[0192] S38: Before optimization, the amount of oxygen introduced by the combustion of coal gas during the ignition process in the sintering process is y g(优化前) The calculation formula is as follows:

[0193]

[0194] After optimization, the amount of oxygen introduced by the combustion of coal gas during the ignition process in the sintering process is g(优化后) The calculation formula is as follows:

[0195]

[0196] S39: Before optimization, the amount of oxygen introduced by the combustion of the carbon-containing fuel in the sintering process is y h(优化前) The calculation formula is as follows:

[0197]

[0198] After optimization, the amount of oxygen introduced by the combustion of carbon-containing fuel in the sintering process is h(优化后) The calculation formula is as follows:

[0199]

[0200] S310: Before optimization, the amount of oxygen introduced by the carbon-containing flux in the sintering process is y i(优化前) The calculation formula is as follows:

[0201]

[0202] After optimization, the amount of oxygen introduced by the carbon-containing flux in the sintering process is i(优化后) The calculation formula is as follows:

[0203]

[0204] S311: Before optimization, the amount of oxygen brought into the sintered ore by the iron oxide redox k(优化前) The calculation formula is as follows:

[0205]

[0206] After optimization, the amount of oxygen brought into the sintered ore by the redox of the iron oxide is k(优化后) The calculation formula is as follows:

[0207]

[0208] S312: Before optimization, the amount of electricity consumed in the sintering process at point E in the ordinate is the amount of oxygen brought into the air y j(优化前) The calculation formula is as follows:

[0209]

[0210] After optimization, the amount of electricity consumed in the sintering process at point E in the ordinate is the amount of oxygen brought in by the air. j(优化后) The calculation formula is as follows:

[0211]

[0212] S313: Before optimization, the ordinate of point E is Y E(优化前) for:

[0213]

[0214] After optimization, the ordinate of point E is Y E(优化后) for:

[0215]

[0216] S314: In summary, the coordinates of points A and E before and after the optimization of the sintering process and the migration of oxygen in each link are statistically shown in Table 6.

[0217] Table 6 Comparison of the origin and migration of oxygen elements in each link before and after sintering process optimization

[0218]

[0219] S4: Plot the migration and change of oxygen element in the sintering process calculated in step S3 in the oxygen migration coordinate system established in step S2, and connect points A and E to draw the oxygen migration line diagram of the sintering process, and obtain the carbon emission K of the qualified sintered ore produced by the production unit in the sintering process. The specific process is as follows:

[0220]

[0221] Carbon emissions K (优化前) The value is 221.337, which means that the emission of carbon dioxide in the sintering process of the production unit of qualified sintered ore is 221.337 kg / t.

[0222] Furthermore, the flow of iron in the long production process of steel enterprises was studied, and the carbon emissions of the sintering process when producing qualified tons of iron products were analyzed using K o Indicates that K o The calculation formula is as follows:

[0223]

[0224] Carbon emissions K o The value is 390.917, which means that the carbon dioxide emissions from the sintering process of the sintered ore required to produce a unit of qualified molten iron is 390.917 kg / t.

[0225] According to the calculation principle of the oxygen migration line diagram of the sintering process, draw the oxygen migration line diagram before the sintering process optimization, such as Figure 4 As shown. Figure 4 It can be seen that the amount of oxygen released in the combustion of carbon-containing fuel in the sintering process is the largest, followed by the electricity consumed in the sintering process, and then the amount of oxygen released in the combustion of ignition gas. The link that releases the least oxygen is the oxygen released by the oxidation and reduction of iron oxides in the sintering return ore. It can be seen from the oxygen migration line diagram that in the sintering process, the link with the largest carbon emission is the combustion of carbon fuel. Therefore, the carbon emission of the sintering process can be reduced by optimizing the fuel structure, reducing the fuel ratio; reducing the air leakage rate, etc., reducing electricity consumption; reducing the proportion of return ore, etc. The limiting link of carbon emission in the sintering process is the combustion of carbon fuel.

[0226] S5: Analyze the impact of process optimization measures on carbon emissions in the sintering process based on the oxygen migration line diagram. The specific process is as follows:

[0227] Compare the differences in the amount of carbon-containing flux, power, yield rate and oxygen migration line before and after the optimization of carbon combustion amount in the sintering process, such as Figure 5 As shown in the figure, after the sintering process is optimized, the amount of carbonate flux required for the sintering process is reduced; the consumption of carbon-containing fuel in the sintering process is reduced, which reduces the oxygen content brought in from the air during the fuel combustion process; the waste of unused physical and chemical energy in the return ore is reduced, the sintering equipment is optimized, and the power consumption of the sintering process is reduced. The effect of multiple factors ultimately causes the ordinate value of point E to change from -1.0977 to -0.9597. Figure 5 It can be seen that the total carbon emission of the sintering process is K (优化后) The calculation formula is as follows:

[0228]

[0229] Carbon emissions K (优化后) The value is 209.413, which means that after optimizing the production process, the carbon dioxide emissions per unit of qualified sintered ore are 209.413kg / t, and the optimized sintering process can reduce carbon dioxide emissions by 11.92kg / t. Figure 5 After the sintering process is optimized, the slope of the oxygen migration line diagram decreases, the operating line becomes flat, and the slope of the oxygen migration line is proportional to the carbon emissions of the sintering process. Therefore, the reduction of carbon emissions in the sintering process can be obtained from the oxygen migration line diagram of the sintering process.

[0230] S51: Reducing the proportion of ore return in the sintering process is an important measure to reduce the waste of physical and chemical energy due to ore return in the sintering process. When the sintering ore yield rate in the sintering process is increased from 75% to 80%, the calculation formula of the carbon emission K' in the sintering process is as follows:

[0231]

[0232] From the carbon emission K' value of 207.503, it can be seen that after improving the sintered ore yield rate, the carbon dioxide emissions of the production unit of qualified sintered ore in the sintering process are 207.503kg / t. Compared with before improving the yield rate, the sintering process can reduce carbon dioxide emissions by 13.834kg / t, and carbon emissions are greatly reduced.

[0233] S6: The recycling of waste energy and waste heat is to use the waste energy and waste heat to generate electricity in steel enterprises, thereby replacing the electricity generated by carbon combustion to reduce carbon emissions. The whole process does not involve the reduction of iron oxides. When the waste energy and waste heat recovery rate of the sintering process increases from 0 to 30%, the ordinate of point A in the oxygen migration line of the sintering process remains unchanged. The specific calculation process is as follows:

[0234]

[0235] Furthermore, the waste energy and waste heat recovery converts the CO in the sintering flue gas into CO2. At this time, the calculation formula of the horizontal coordinate of point A in the oxygen migration line of the sintering process is as follows:

[0236]

[0237] Furthermore, during the waste energy and waste heat recovery process, the combustion of coal gas will bring in oxygen from the air, so the vertical coordinate calculation formula of point E is as follows:

[0238]

[0239] At this time, the carbon emission K (余能余热回收) The calculation formula is as follows:

[0240]

[0241] Carbon emissions K (余能余热回收) The value is 200.72, which means that after improving the waste energy and waste heat recovery rate of the sintering process, the carbon dioxide emissions per unit of qualified sintered ore produced in the sintering process is 200.72kg / t. Compared with before the sintering process optimization, 20.62kg / t of carbon dioxide can be reduced, and carbon emissions are greatly reduced.

[0242] The oxygen migration lines of the sintering process before optimization and when the waste energy and waste heat recovery rate is 30% are plotted on Figure 6 ,like Figure 6 As shown, increasing the waste energy and waste heat recovery rate will cause the horizontal coordinate of point A in the oxygen migration line to shift to the right. The recovered waste energy can generate electricity, which is equivalent to reducing the power consumption in the steel production process. It will cause the vertical coordinate of point E to shift upward, and ultimately lead to a decrease in the slope of the oxygen migration line, which means that the carbon consumption per mole of iron produced is reduced, that is, the carbon emissions of the sintering process are reduced.

[0243] In summary, the present invention discloses a method for calculating carbon emissions in a sintering process. Based on the physical and chemical reaction between Fe-OC in the sintering process, the data on energy and carbonaceous element consumption in the sintering process due to the addition of return ore and the data analysis of waste energy and waste heat recovery are added. Through the migration and change of oxygen and carbon elements, an oxygen migration coordinate system is constructed, and an oxygen migration line diagram of the sintering process is drawn in the oxygen migration coordinate system. According to the oxygen migration line diagram, the carbon emission K of the sintering process when producing a unit of qualified sintered ore and the carbon emission K of the sintering process when producing a unit of qualified iron products are calculated. o . Through the above method, the consumption of carbon in the sintering process can be clearly expressed in the form of oxygen migration lines, the composition of carbon emissions in the sintering process can be clarified, the restrictive links for reducing carbon emissions can be pointed out, and a reasonable and highly executable carbon emission optimization plan can be given. It is a simple calculation and analysis method with easy data acquisition, visualized calculation results, and high executable carbon emission optimization plan. It has important guiding significance for optimizing the energy consumption of the sintering process of steel enterprises and reducing the carbon emissions of the sintering process. At the same time, the sintering process is linked to the entire process of steel production, which is convenient for the economic accounting of steel enterprises.

[0244] The above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention.

Claims

1. A method for calculating carbon emissions from a sintering process, characterized in that: S1. Based on the physical and chemical reaction between Fe-OC in the sintering process, the migration and change data of oxygen and carbon elements in the sintering process are collected, and the data include the analysis data of the consumption of energy and carbonaceous elements in the sintering process due to the return ore and the analysis data of the recovery and utilization of residual energy and waste heat; before collecting the migration and change data of oxygen and carbon elements in the sintering process, the change path of the O element in the sintering process is clarified, and the O element in the sintering process includes the oxygen in the iron oxides of Fe2O3 and Fe3O4, and the oxygen in the air during the exhaust sintering process that migrates to the oxygen in CO and CO2 in the sintering flue gas; the change path of the C element in the sintering process is clarified, and the C element in the sintering process includes the CO in the ignition gas, the C in the carbon-containing fuel that combines with oxygen to produce CO2 and carbon in CO; S2. constructing an oxygen migration coordinate system of the sintering process, and drawing an oxygen migration line diagram of the sintering process in the oxygen migration coordinate system; The oxygen migration line is constructed by plotting the migration and change process of oxygen and carbon in the sintering process in a rectangular coordinate system, wherein the horizontal axis represents the number of oxygen atoms bonded to each carbon atom in the sintering process, and the vertical axis represents the amount of oxygen bonded to each iron atom migrated to the carbon atom in the sintering process, thereby constructing the oxygen migration coordinate system of the sintering process; The oxygen migration line diagram is drawn by analyzing the process of oxygen migration from iron oxide to carbon oxide in the sintering process, and the migration amount is expressed as the horizontal coordinate X at point A. A Indicates that the migration process of the oxygen element combined with the iron element in the sintering process is analyzed, and the amount of migration is expressed as the ordinate Y of point A. A and the ordinate Y of point E E Indicates that the horizontal coordinate of point E is defined as 0; points A and E are plotted in the oxygen migration coordinate system established in step S2 according to their coordinates, and points A and E are connected to draw an oxygen migration line diagram of the sintering process; S3. Calculate the carbon emission K of the sintering process to produce a unit of qualified sintered ore according to the oxygen migration line diagram, and the carbon emission K of the sintering process to produce a unit of qualified iron product. ο .

2. The method for calculating carbon emissions from a sintering process according to claim 1, characterized in that: According to the oxygen migration line diagram, the effects of sintering process parameter optimization, purchased clean electricity, and waste energy and waste heat recovery on the oxygen migration line and carbon emissions K are analyzed, so as to evaluate the process parameters of the sintering process and guide the selection of the optimal process parameters of the sintering process with the lowest carbon emissions for process optimization.

3. The method for calculating carbon emissions from a sintering process according to claim 1, characterized in that: In step S1, the migration and change data of the oxygen element in the sintering process include the source data of oxygen, specifically including the amount of oxygen brought in by the oxidation and reduction of the iron element, the amount of oxygen brought in by the combustion of coal gas during the ignition process, the amount of oxygen brought in by the combustion of carbon-containing fuel in the sintering process, the amount of oxygen brought in by the carbon-containing flux, the amount of oxygen brought in by the oxidation and reduction of the sintering return ore, and the amount of oxygen brought in from the air when producing the electricity consumed in the sintering process; in addition, the migration and change data of the oxygen element in the sintering process also include the migration data of oxygen, specifically including the CO and CO2 content in the sintering flue gas, the CO2 content generated by the electricity consumed in the sintering process, and the amount of coal gas required to produce a unit of sintered ore; the data of the sintering process include the TFe content, Fe2O3 content, and Fe3O4 content in the iron ore; the sintered ore output; the TFe content, Fe2O3 content, and Fe3O4 content in the finished sintered ore; the qualified sintered ore output, the sintered ore finished product rate, and the carbon content of the carbon-containing fuel.

4. The method for calculating carbon emissions from a sintering process according to claim 1, characterized in that: The amount of oxygen element migration in each link of the sintering process refers to the amount of substances consumed in each link of the sintering process converted into the consumption per unit of finished sintered ore.

5. The method for calculating carbon emissions from a sintering process according to claim 1, characterized in that: The horizontal coordinate X of point A A and the ordinate Y A The calculation formula is as follows: Where: x i is the carbon-containing flue gas brought into the sintering flue gas by the decomposition of carbon-containing flux, in mol; x h is the carbon-containing flue gas brought into the sintering flue gas by the combustion of carbon-containing fuel, in mol; x g It is the carbon-containing flue gas brought into the sintering flue gas by the combustion of ignition gas, the unit is mol; x j is the carbon-containing flue gas brought into the sintering flue gas by combustion power generation, in mol; x1 is the mass percentage of completely burned carbon in the solid fuel, in %; The carbon-containing flue gas x brought in by the decomposition of the carbon-containing flux i The calculation formula is as follows: Among them: U fs The consumption of carbon flux per unit mass of sintered ore produced, in kg / t; is the mass percentage of calcium carbonate in the flux, in %; β is the decomposition rate of CaCO3, in %; The carbon-containing flue gas x brought in by the combustion of the carbon-containing fuel h The calculation formula is as follows: Among them: U rs P is the solid fuel consumption per unit mass of sintered ore produced, in kg / t; c is the mass percentage of carbon element in solid fuel pulverized coal, in %; The carbon-containing flue gas x brought in by combustion and power generation in the sintering process j The calculation formula is as follows: Among them: U ES is the amount of electricity required to produce a unit mass of sintered ore, in kWh / t; k is the molar amount of carbon consumed per kilowatt-hour of electricity produced, in mol / kWh; The carbon-containing flue gas x brought in by the combustion of the ignition gas g The calculation formula is as follows: Where: V is The amount of gas consumed in the production of unit mass of sintered ore during the ignition process, in m 3 / t; is the percentage of CO in the consumed ignition gas, in %; Where: w(Fe2O3) O Indicates the Fe2O3 content in iron ore; w(FeO) O Indicates the FeO content in iron ore; w(TFe) O Indicates the TFe content in iron ore; w(Fe2O3) S Indicates the Fe2O3 content in the finished sintered ore; w(FeO) S Indicates the FeO content in the finished sintered ore; w(TFe) S Indicates the TFe content in the finished sintered ore.

6. The method for calculating carbon emissions from a sintering process according to claim 5, characterized in that: The X A In the calculation formula, the mass percentage of carbon in completely burned solid fuel is represented by x1, and the mass percentage of carbon in incompletely burned solid fuel is represented by x2. The calculation formulas of x1 and x2 are as follows: in: is the percentage of CO in sintering flue gas, in %; is the percentage of CO2 in sintering flue gas, in %; is the percentage of CO2 in the consumed ignition gas, in %; It is the percentage of CO in the consumed ignition gas, in %.

7. The method for calculating carbon emissions from a sintering process according to claim 1, characterized in that: The horizontal coordinate Y of point E E The calculation formula is as follows: AND E =-(and g +y h +y i +y j +y k ) Where: y g It is the amount of oxygen brought in by the combustion of coal gas during the ignition process in the sintering process; h The amount of oxygen introduced by the combustion of carbon-containing fuel during the sintering process; i is the amount of oxygen brought into the sintering process by the carbon-containing flux; k The amount of oxygen brought in by the oxidation and reduction of the sintered ore during the sintering process; j The amount of oxygen brought in from the air to produce the electricity consumed in the sintering process; The amount of oxygen introduced by the combustion of coal gas during the ignition process in the sintering process is g The calculation formula is as follows: Where: n(Fe) is the amount of iron element, in mol; m is the output of qualified sintered ore, in kg; is the yield rate of sintered ore, in %; The amount of oxygen introduced by the combustion of carbon-containing fuel in the sintering process is h The calculation formula is as follows: The amount of oxygen introduced by the carbon-containing flux in the sintering process is i The calculation formula is as follows: The amount of oxygen brought in by the oxidation and reduction of the sintered ore during the sintering process is k The calculation formula is as follows: Most of the electricity consumed in the sintering process is obtained by the heat released by the combination of C and O during thermal power generation. Therefore, the electricity consumed in the sintering process at point E in the ordinate is the amount of oxygen brought in by the air. j The calculation formula is as follows:

8. The method for calculating carbon emissions from a sintering process according to claim 1, characterized in that: The carbon emissions generated by the production of qualified sintered ore in the sintering process are expressed by the K value, and the calculation formula of K is as follows: Furthermore, the flow of iron in the long production process of steel enterprises was studied, and the carbon emissions of the sintering process when producing qualified tons of iron products were analyzed using K o Indicates that K o The calculation formula is as follows:

9. The method for calculating carbon emissions from a sintering process according to claim 2, characterized in that: The recycling of waste energy and waste heat is to use the waste energy and waste heat to generate electricity in the steel enterprise, thereby replacing the electricity generated by carbon combustion to reduce carbon emissions. The whole process does not involve the reduction of iron oxides. At this time, the ordinate of point A in the oxygen migration line of the sintering process remains unchanged: Where: Y′ A It indicates the amount of oxygen element migration combined with iron element in the sintering process after the waste energy and waste heat are recovered; In the waste energy and waste heat recovery process, CO in the sintering flue gas is converted into CO2. At this time, the calculation formula of the horizontal coordinate of point A in the oxygen migration line of the sintering process is as follows: Where: θ is the waste energy and waste heat recovery rate, in %; X′ A It indicates the amount of oxygen element migration from iron oxide to carbon oxide in the sintering process after the waste energy and waste heat are recovered; In the waste energy and waste heat recovery process, the combustion of coal gas will bring in oxygen from the air, so the vertical coordinate calculation formula of point E is as follows: Where: Y′ E It indicates the amount of oxygen element migration combined with iron element in the sintering process after the waste energy and waste heat are recovered; The amount of CO2 generated by recycling CO in the sintering process to produce qualified steel products; The carbon emission of the waste energy and waste heat recovery is K (余能余热回收) The calculation formula is as follows:

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