CN114925314A - Method for calculating carbon emission in sintering process - Google Patents

Abstract

The invention discloses a method for calculating carbon emissions in a sintering process. Based on the physical and chemical reactions between Fe-O-C in the sintering process, the consumption data of energy and carbonaceous elements in the sintering process and the recovery and utilization of waste energy and waste heat are increased by returning ore. Data analysis, through the migration and change of oxygen and carbon elements, the oxygen migration coordinate system is constructed, and the oxygen migration line diagram of the sintering process is drawn in the oxygen migration coordinate system, and the qualified sintering unit in the sintering process is calculated according to the oxygen migration line diagram. The carbon emission K of the ore, and the carbon emission K _o of the sintering process when producing qualified ton iron products. 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 is useful for optimizing the energy consumption of the sintering process in iron and steel enterprises and reducing carbon emissions. important guiding significance. At the same time, the sintering process is associated with the whole process of iron and steel production, which is convenient for the economic accounting of iron and steel enterprises.

Description

A calculation method of carbon emission in sintering process

technical field

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

Background technique

my country's iron and steel industry is the basic industry of the national economy. After years of development, great achievements have been made. In 2021, the output of crude steel will be 1.032 billion tons, accounting for 52.91% of the world's total output. However, the level of green manufacturing and energy saving and emission reduction in the iron and steel smelting process still needs to be improved. The carbon emission of China's iron and steel industry accounts for about 15% to 18% of the total carbon emission of the country, and the carbon emission of the sintering process accounts for the carbon emission of the whole process of iron and steel production. With the strict requirements for energy saving and CO ₂ emission reduction in the "carbon peak, carbon neutral" goal, the iron and steel industry needs to carry out huge industrial restructuring and carbon emission reduction work.

The predecessors have done a lot of research and summary on the calculation and analysis of carbon emissions from iron and steel enterprises. Their work mainly focuses on collecting the greenhouse gases emitted by the production unit of iron and steel enterprises through statistical methods, and then combining investigation, actual measurement or material balance. The calculation method obtains the proportion of each process in the total emissions. These works have an important reference for understanding the carbon emissions of iron and steel enterprises and summarizing the key links of carbon emissions in iron and steel enterprises, but they are less able to analyze carbon emissions in combination with the specific reactions occurring in each process in the iron and steel production process, which is not conducive to giving specific reductions. carbon emission solutions.

In the prior art, the master's thesis titled "Analysis and Research on Energy Conservation and Consumption Reduction of 1# Blast Furnace of a Steel Plant" published in 2007 constructed the operation diagram of blast furnace process, analyzed the potential of reducing fuel ratio, and studied different factors. The influence on the fuel ratio, and the regression model of the influence of different factors on the comprehensive coke ratio. However, this calculation method cannot analyze the carbon consumption caused by the electric energy consumed in the blast furnace process and the impact of waste energy and waste heat recovery, outsourcing clean energy, etc. on carbon consumption. The calculation results only represent the fuel ratio of the blast furnace process, not the carbon emissions. The carbon-containing flux added in the sintering process will decompose and generate CO ₂ during the sintering process, and the above calculation method cannot analyze the carbon emission generated by the added flux. In addition, the calculation method only considers the coordinates of point A. The content of iron ore and iron oxide in the raw materials of the blast furnace process, but for the sintering process, both the raw materials and products have the existence of iron oxides, so the calculation of the ordinate of point A does not match the actual sintering process, and the analysis results fail to reflect the reality The carbon consumption situation is not able to provide strong support for optimizing carbon emissions.

In view of this, it is necessary to design a calculation method of carbon emission in sintering process to solve the above problems.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a calculation method for carbon emission in the sintering process, based on the physical and chemical reaction between Fe-OC in the sintering process, to increase the waste of energy and carbon elements in the sintering process by returning ore and waste energy and waste heat. Recycling data analysis, establish an oxygen migration line diagram according to the migration and changes of oxygen and carbon elements in the sintering process, so as to calculate the carbon emission K of the qualified sinter production unit in the sintering process, and the sintering process when producing a qualified ton iron product per unit Based 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 to reduce the sintering process. Carbon emissions have important guiding significance. At the same time, linking the sintering process with the whole process of steel production is convenient for the economic accounting of iron and steel enterprises.

In order to achieve the above 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, and the oxygen and carbon elements in the sintering process are constructed. transfer the coordinate system, and draw the oxygen transfer line diagram of the sintering process in the oxygen transfer coordinate system, and calculate the carbon emission K of the qualified sinter production unit in the sintering process according to the oxygen transfer line diagram, and produce qualified iron products per ton The carbon emission K _o of the sintering process during the sintering process; wherein, the migration and change data of oxygen and carbon elements include the analysis data of the energy and carbon element consumption in the sintering process and the analysis data of the recovery and utilization of waste energy and heat.

As a further improvement of the present invention, according to the oxygen migration line diagram, the effects of optimization of sintering process parameters, purchased clean power, and waste energy and waste heat recovery on the oxygen migration line and carbon emission K are analyzed, so as to influence the process of the sintering process. The parameters are evaluated to guide the selection of the optimal process parameters of the sintering process with the lowest carbon emission for process optimization.

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

In step S1, before collecting the migration and change data of oxygen and carbon elements in the sintering process, it is clear that the O element in the sintering process includes Fe ₂ O ₃ and Fe ₃ O ₄ iron oxides during the sintering process Oxygen in the sintering process, the oxygen in the air migrates to the CO and _CO2 in the sintering flue gas during the sintering process. The change path of the oxygen in the sintering process, the C element in the sintering process includes the CO in the ignition gas and the C in the carbon-containing fuel during the sintering process Change paths of carbon when combined with oxygen to produce _CO and CO;

In step S2, the construction of the oxygen migration line is as follows: the migration and change process of oxygen and carbon in the sintering process are plotted in a rectangular coordinate system, and the abscissa represents the relationship between the sintering process and each carbon The number of oxygen atoms bound by atoms, the ordinate represents the amount of oxygen bound to each iron atom in the sintering process that migrates to carbon atoms, and the oxygen migration coordinate system of the sintering process is constructed;

The oxygen migration line diagram is drawn by: analyzing the migration process of oxygen elements from iron oxides to carbon oxides in the sintering process, and expressing the amount of migration by the abscissa X _A of point A, and analyzing the process of the sintering process. The migration process of oxygen element combined with iron element, the amount of migration is represented by the ordinate Y A of point _A and the ordinate Y _E of point E, and the abscissa of point E is defined as 0; according to the coordinates of point A and point E, the Points A and E are drawn in the oxygen transfer coordinate system established in step S2, and two points A and E are connected to draw an oxygen transfer line diagram of the sintering process.

As a further improvement of the present invention, in step S1, the migration and change data of the oxygen element in the sintering process includes the source data of oxygen, specifically including the amount of oxygen brought in by the redox of iron element, the amount of oxygen brought in by the combustion of 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 redox of the sintered ore, and the amount of electricity consumed in the production of the sintering process. In addition, the data on the migration and change of oxygen elements in the sintering process also includes the data on the migration of oxygen, specifically including the CO and CO ₂ content in the sintering flue gas, the CO ₂ content generated by the electrical energy consumed in the sintering process, the production unit The amount of gas to be consumed by the sinter; the data of the sintering process include the content of TFe, Fe ₂ O ₃ and Fe ₃ O ₄ in the iron ore; the output of the sinter; the content of TFe, Fe ₂ O in the finished sinter ₃ content, Fe ₃ O ₄ content; qualified sinter output, sinter yield, carbon content of carbon-containing fuel.

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

As a further improvement of the present invention, the calculation formulas of the abscissa X _A and the ordinate Y _A of the point A are as follows:

Where: x _i is the carbon-containing flue gas brought in by the decomposition of the carbon-containing flux in the sintering flue gas, the unit is mol; x _h is the carbon-containing flue gas brought in by the combustion of the carbon-containing fuel in the sintering flue gas, the unit is mol; x _g is the carbon-containing flue gas brought by the ignition gas combustion in the sintering flue gas, the unit is mol; x _j is the carbon-containing flue gas brought in by the combustion of the sintering flue gas for power generation, the unit is mol; x ₁ is the solid fuel The mass percentage of carbon that is completely burned, in %;

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

为熔剂中的碳酸钙的质量百分比，单位为％；β为CaCO₃的分解率，单位为％；Among them: U _fs is the consumption of carbon-containing flux per unit mass of sinter production, the unit is kg/t;

is the mass percentage of calcium carbonate in the flux, the unit is %; β is the decomposition rate of CaCO ₃ , the unit is %;

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

Among them: U _rs is the solid fuel consumption per unit mass of sinter production, the unit is kg/t; P _c is the mass percentage of carbon element in the solid fuel pulverized coal, the unit is %;

The calculation formula of the carbon-containing flue gas x _j brought in by combustion and power generation in the sintering process is as follows:

Among them: U _ES is the electricity consumption required to produce unit mass of sinter, the unit is kWh/t; k is the mole amount of carbon consumed per kWh of electricity, the unit is mol/kWh;

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

为所消耗的点火煤气中CO的百分含量，单位为％；Among them: V _is the amount of gas consumed to produce unit mass of sinter in the ignition process, in m ³ /t;

is the percentage of CO in the consumed ignition gas, the unit is %;

Wherein: w(Fe ₂ O ₃ ) _O represents the Fe ₂ O ₃ content in the iron ore; w(FeO) _O represents the FeO content in the iron ore; w(TFe) _O represents the TFe content in the iron ore; w(Fe ₂ O ₃ ) _S denotes the Fe ₂ O ₃ content in the finished sinter; w(FeO) _S denotes the FeO content in the finished sinter; w(TFe) _S denotes the TFe content in the finished sinter.

As a further improvement of the present invention, in the calculation formula of X _A , the mass percentage of carbon occupied by the complete combustion of the solid fuel is represented by x ₁ , and the mass percentage of carbon occupied by the incomplete combustion of the solid fuel is represented by x ₂ , and x ₁ The formula for calculating and x ₂ is as follows:

为烧结烟气中CO的百分含量，单位为％；

为烧结烟气中CO₂的百分含量，单位为％；

为所消耗的点火煤气中CO₂的百分含量，单位为％；

为所消耗的点火煤气中CO的百分含量，单位为％。in:

is the percentage of CO in the sintering flue gas, the unit is %;

is the percentage of CO ₂ in the sintering flue gas, the unit is %;

is the percentage of _CO2 in the consumed ignition gas, the unit is %;

It is the percentage of CO in the consumed ignition gas, the unit is %.

As a further improvement of the present invention, the calculation formula of the abscissa Y _E of the E point is as follows:

Y _E =-(y _g +y _h +y _i +y _j +y _k )

Wherein: y _g is the amount of oxygen brought in by gas combustion in the ignition process in the sintering process; y _h is the amount of oxygen brought in by the combustion of carbon-containing fuel in the sintering process; _y is the amount of oxygen brought in by the carbon-containing flux in the sintering process; y _k is the amount of oxygen brought in by the redox of the sintered returning ore in the sintering process; y _j is the amount of oxygen brought in by the air when producing the electricity consumed in the sintering process;

The calculation formula of the oxygen amount y _g brought in by the combustion of gas in the ignition process in the sintering process is as follows:

为烧结矿的成品率，单位为％；Among them: n(Fe) is the amount of iron, the unit is mol; m is the output of qualified sinter, the unit is kg;

is the yield of sintered ore, the unit is %;

The calculation formula of the oxygen amount y _h brought in by the combustion of the carbonaceous fuel in the sintering process is as follows:

The calculation formula of the oxygen amount _yi brought by the carbon-containing flux in the sintering process is as follows:

In the sintering process, the formula for calculating the oxygen amount y _k brought in by the redox of the sintered ore returning is as follows:

Most of the power consumed in the sintering process is obtained by the combination of C and O during thermal power generation. Therefore, in the sintering process, the amount of oxygen brought in by the air when producing the electricity consumed by the sintering process in the ordinate of point E in the sintering process The formula for calculating _yj is as follows:

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

Further, taking the circulation of iron elements in the long-term production process of iron and steel enterprises as the research object, the carbon emission of the sintering process when producing qualified ton iron products is expressed by K _o , and the calculation formula of K _o is as follows:

As a further improvement of the present invention, the recovery and utilization of the waste energy and waste heat is to use the waste energy waste heat recovery for power generation in iron and steel enterprises to replace the electric energy generated by carbon combustion to reduce carbon emissions, and 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:

Wherein: Y' _A represents the migration amount of the oxygen element combined with the iron element in the sintering process after the waste energy and waste heat recovery and utilization;

The CO in the sintering flue gas is converted into CO ₂ during the recovery and utilization of the waste energy and heat. At this time, the calculation formula of the abscissa of point A in the oxygen migration line of the sintering process is as follows:

Wherein: θ is the utilization rate of waste energy and waste heat recovery, the unit is %; X' _A represents the amount of oxygen element migrated from iron oxides to carbon oxides in the sintering process after waste energy and waste heat recovery and utilization;

In the process of the waste energy and waste heat recovery and utilization, the combustion of gas will cause oxygen in the air to be brought in, so the ordinate calculation formula of point E is as follows:

为烧结工序中生产单位合格钢铁产品过程回收再利用CO产生的CO₂的量；Wherein: Y ' _E represents the amount of the migration of the oxygen element combined with the iron element in the sintering operation after the waste energy and waste heat recovery and utilization;

It is the amount of _CO2 produced by recycling and reusing CO2 in the production unit of qualified steel products in the sintering process;

The calculation formula of the carbon emission K _{(recovery of waste energy and waste heat)} of the waste energy and waste heat recovery and utilization is as follows:

The beneficial effects of the present invention are:

1. The present invention establishes a calculation method for carbon emission in the sintering process by combining the migration and change of Fe-O-C three elements, which can clearly show the consumption of carbon in the sintering process in the form of oxygen migration lines, providing A new calculation method for analyzing carbon emissions from sintering processes.

2. The present invention can clearly visualize the various processes of the sintering process through the constructed oxygen migration line, and combine the carbon emissions generated by the various processes to construct the carbon emission calculation formula of the qualified sintered ore in the sintering process. The calculation formula of carbon emission per unit of pig iron in the sintering process is also constructed, which links the sintering process with the whole process of iron and steel production.

3. In the present invention, the loss of material and energy caused by returning ore in the sintering process is added to the oxygen migration process in the sintering process, and by establishing the oxygen migration line of the sintering process, the energy wasted by the returning ore is fully taken into account in each sintering process. In one process, the carbon emission calculation method of the sintering process is optimized; at the same time, the return ore and the yield are closely linked, and the calculation method of the present invention can obtain the yield control critical value, so as to minimize the carbon emission and avoid the production rate caused by the production rate. The lower amount of ore returned increases, resulting in an increase in the waste of materials, energy and supporting facilities in the sintering process, and an increase in the investment of materials, energy and supporting facilities in the early stage in order to improve the yield, resulting in an increase in carbon emissions. .

4. In the present invention, the electric energy consumed by the supporting facilities in the sintering process and the recovery of residual energy and waste heat are added to 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 It can clarify the composition of carbon emission in the sintering process, analyze the carbon emission potential of the sintering process, and provide a reasonable and highly executable carbon emission optimization plan;

5. The present invention provides a calculation and analysis method that is simple, easy to obtain data, visualized calculation results, and highly executable carbon emission optimization scheme, which is important for optimizing the energy consumption of the sintering process of iron and steel enterprises and reducing the carbon emission in the sintering process. guiding significance.

Description of drawings

Figure 1 shows the design idea of the oxygen migration line diagram in the sintering process.

FIG. 2 is an oxygen migration line diagram in the sintering process.

FIG. 3 is a coordinate system of oxygen migration in the sintering process in the embodiment.

FIG. 4 is an oxygen migration line diagram of the sintering process in the example.

FIG. 5 is the oxygen migration diagram before and after optimization of the sintering process.

FIG. 6 is an oxygen transfer line diagram when the waste energy and waste heat recovery and utilization are considered in the sintering process.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

Here, 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 solution of the present invention are shown in the drawings, and the Invent other details that are less relevant.

In addition, it should be noted that the terms "comprising", "comprising" or any other variation thereof are intended to encompass a non-exclusive inclusion such that a process, method, article or device comprising a series of elements includes not only those elements, but also Also included are other elements not expressly listed or inherent to such a process, method, article or apparatus.

The invention provides a method for calculating carbon emission in a sintering process. Based on the physicochemical 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 coordinate system is constructed in the sintering process. The oxygen migration line diagram of the sintering process is drawn in the oxygen migration coordinate system, and the carbon emission K of the qualified sintering ore produced in the sintering process is calculated according to the oxygen migration line diagram, and the carbon emission of the sintering process when producing qualified ton iron products is obtained. Quantity K _o ; wherein, in the migration and change data of oxygen and carbon elements, the analysis data of energy and carbon element consumption in the sintering process and the analysis data of waste energy and waste heat recovery and utilization are included in the returned ore.

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

Specifically, the calculation method for carbon emissions in the sintering process includes the following steps:

S1. It is clear that the O element in the sintering process includes the oxygen in the iron oxides of Fe ₂ O ₃ and Fe ₃ O ₄ and the oxygen in the air in the air sintering process to migrate to CO and CO ₂ in the sintering flue gas The change path of oxygen in the sintering process, the change path of carbon element in the sintering process, including CO in ignition gas and C in carbon-containing fuel combined with oxygen to produce CO ₂ and CO, to collect oxygen and carbon in the sintering process. Data on migration and change of elements; data on migration and change of oxygen element in the sintering process include data on the source of oxygen, specifically including the amount of oxygen brought in by the redox of iron element, and the amount of oxygen brought in by gas combustion during ignition , 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 the carbon-containing flux, the amount of oxygen brought in by the redox of the sintered ore, and the amount of oxygen brought in by the air when producing the electricity consumed in the sintering process; In addition, the data on the migration and change of oxygen elements in the sintering process also includes the data on the migration of oxygen, specifically including the CO and CO ₂ content in the sintering flue gas, the CO ₂ content generated by the electric energy consumed in the sintering process, and the production unit of sintered ore. The amount of gas consumed; the data of the sintering process include TFe content, Fe ₂ O ₃ content, Fe ₃ O ₄ content in iron ore; sinter output; TFe content, Fe ₂ O ₃ content, Fe 2 O 3 content in finished sinter Fe ₃ O ₄ content; qualified sinter output, sinter yield, carbon content of carbonaceous fuel;

S2: Draw the migration and change process of oxygen and carbon in the sintering process in a rectangular coordinate system, the abscissa represents the number of oxygen atoms combined with each carbon atom in the sintering process, and the ordinate represents the sintering process The amount of oxygen bound to each iron atom in the process that migrates to carbon atoms, and the oxygen migration coordinate system of the sintering process is constructed;

S3: analyze the migration process of oxygen elements from iron oxides to carbon oxides in the sintering process, the amount of migration is represented by the abscissa X _A of point A, and analyze the migration of oxygen elements combined with iron elements in the sintering process In the process, the amount of migration is represented by the ordinate Y A of point _A and the ordinate Y _E of point E, and the abscissa of point E is defined as 0;

S4: Plot the migration and variation of oxygen elements in the sintering process calculated in step S3 in the oxygen migration coordinate system established in S2, and connect points A and E to plot the oxygen migration in the sintering process A line graph, the carbon emission amount K of a qualified sintered ore per production unit in the sintering process is obtained by calculating the oxygen migration line graph.

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

Specifically, the calculation formulas of the abscissa X _A and the ordinate Y _A of point A are as follows:

Where: x _i is the carbon-containing flue gas brought in by the decomposition of the carbon-containing flux in the sintering flue gas, the unit is mol; x _h is the carbon-containing flue gas brought in by the combustion of the carbon-containing fuel in the sintering flue gas, the unit is mol; x _g is the carbon-containing flue gas brought by the ignition gas combustion in the sintering flue gas, the unit is mol; x _j is the carbon-containing flue gas brought in by the combustion of the sintering flue gas for power generation, the unit is mol; x ₁ is the solid fuel The mass percentage of carbon that is completely burned, in %;

Compared with the traditional operation line for calculating the coke ratio, the flue gas in the sintering process includes both the combustion of gas, the combustion of carbon-containing fuel, and the decomposition of carbon-containing flux in the sintering process, as well as from thermal power generation and coal gas. Therefore, in the calculation of point A, in addition to the analysis of the carbon-to-oxygen ratio of the sintering process itself, the analysis of the carbon-to-oxygen ratio of thermal power generation and coal gas was also carried out through the material balance. Compared with the conventional calculation method, the calculation method of the present invention not only analyzes the change of 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 result can more truly reflect the actual situation. carbon emission;

The calculation formula of carbon-containing flue gas _xi brought in by the decomposition of carbon-containing flux is as follows:

为熔剂中的碳酸钙的质量百分比，单位为％；β为CaCO₃的分解率，单位为％；Among them: U _fs is the consumption of carbon-containing flux per unit mass of sinter production, the unit is kg/t;

is the mass percentage of calcium carbonate in the flux, the unit is %; β is the decomposition rate of CaCO ₃ , the unit is %;

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

Among them: U _rs is the solid fuel consumption per unit mass of sinter production, the unit is kg/t; P _c is the mass percentage of carbon element in the solid fuel pulverized coal, the unit is %;

The calculation formula of carbon-containing flue gas x _j brought in by combustion power generation in the sintering process is as follows:

Among them: U _ES is the electricity consumption required to produce unit mass of sinter, the unit is kWh/t; k is the mole amount of carbon consumed per kWh of electricity, the unit is mol/kWh;

The calculation formula of carbon-containing flue gas x _g brought in by ignition gas combustion is as follows:

为所消耗的点火煤气中CO的百分含量，单位为％；Among them: V _is the amount of gas consumed to produce unit mass of sinter in the ignition process, in m ³ /t;

is the percentage of CO in the consumed ignition gas, the unit is %;

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

Wherein: w(Fe ₂ O ₃ ) _O represents the Fe ₂ O ₃ content in the iron ore; w(FeO) _O represents the FeO content in the iron ore; w(TFe) _O represents the TFe content in the iron ore; w(Fe ₂ O ₃ ) _S denotes the Fe ₂ O ₃ content in the finished sinter; w(FeO) _S denotes the FeO content in the finished sinter; w(TFe) _S denotes the TFe content in the finished sinter.

Specifically, in the calculation formula of X _A , the mass percentage of carbon in the complete combustion of solid fuel is represented by x ₁ , and the mass percentage of carbon in incomplete combustion of solid fuel is represented by x _2. The calculation formulas of x ₁ and x ₂ as follows:

为烧结烟气中CO的百分含量，单位为％；

为烧结烟气中CO₂的百分含量，单位为％；

为所消耗的点火煤气中CO₂的百分含量，单位为％；

为所消耗的点火煤气中CO的百分含量，单位为％。in:

is the percentage of CO in the sintering flue gas, the unit is %;

is the percentage of CO ₂ in the sintering flue gas, the unit is %;

is the percentage of _CO2 in the consumed ignition gas, the unit is %;

It is the percentage of CO in the consumed ignition gas, the unit is %.

Specifically, the calculation formula of the abscissa Y _E of point E is as follows:

Y _E =-(y _g +y _h +y _i +y _j +y _k )

Wherein: y _g is the amount of oxygen brought in by gas combustion in the ignition process in the sintering process; y _h is the amount of oxygen brought in by the combustion of carbon-containing fuel in the sintering process; _y is the amount of oxygen brought in by the carbon-containing flux in the sintering process; y _k is the amount of oxygen brought in by the redox of the sintered returning ore in the sintering process; y _j is the amount of oxygen brought in by the air when producing the electricity consumed in the sintering process;

In the sintering process, the calculation formula of the oxygen amount y _g brought in by the combustion of the gas during the ignition process is as follows:

为烧结矿的成品率，单位为％；Among them: n(Fe) is the amount of iron, the unit is mol; m is the output of qualified sinter, the unit is kg;

is the yield of sintered ore, the unit is %;

From the calculation formula of y _g , it can be seen that the amount of oxygen brought in by the combustion of ignition gas is related to the volume of gas and the amount of CO contained in it. This formula can compare the influence of different gas proportioning methods on y _g , so as to choose the most suitable gas. Provide theoretical basis for optimal gas volume;

The formula for calculating the amount of oxygen y _h brought in by the combustion of carbonaceous fuel in the sintering process is as follows:

From the calculation of y _h , it can be seen that the amount of oxygen brought by the combustion of carbon-containing fuel is related to the complete fuel ratio and carbon content of carbon-containing fuel. So as to provide a theoretical basis for optimizing the carbon emission of the sintering process;

The calculation formula of the oxygen amount _yi brought by the carbon-containing flux in the sintering process is as follows:

The yield of the sintered ore obtained in the sintering process is limited, and part of the sintered returned ore is not used, but the iron oxide contained in it participates in the redox reaction and brings in the amount of oxygen. The formula for calculating the quantity _yk is as follows:

Most of the power consumed in the sintering process is obtained by the combination of C and O during thermal power generation. Therefore, in the sintering process, the amount of oxygen brought in by the air when producing the electricity consumed by the sintering process in the ordinate of point E in the sintering process The formula for calculating _yj is as follows:

The calculation of point E takes into account the influence of the yield in the sintering process on the carbon emission of the finished sintered ore. The yield of the sintering process determines the proportion of the returned ore. The returned ore will also participate in the redox reaction during the sintering process, and this part of the energy will not enter In the finished sintered ore, energy is wasted, and the conventional calculation method only takes into account the waste of waste energy and heat caused by returning ore. The calculation method of the present invention fully considers the impact of returning ore on carbon emissions in the entire sintering process.

Specifically, in the sintering process, the carbon emission of qualified sintered ore per production unit is represented by the K value. The size of 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:

Further, taking the circulation of iron elements in the long-term production process of iron and steel enterprises as the research object, the carbon emission of the sintering process when producing qualified ton iron products is expressed by K _o , and the calculation formula of K _o is as follows:

Specifically, the recovery and utilization of waste energy and waste heat is to use waste energy and waste heat for power generation in iron and steel enterprises to replace 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 oxygen in the sintering process is The ordinate of point A in the migration line does not change:

Wherein: Y' _A represents the migration amount of the oxygen element combined with the iron element in the sintering process after the waste energy and waste heat recovery and utilization;

The CO in the sintering flue gas is converted into CO ₂ during the recovery and utilization of the waste energy and heat. At this time, the calculation formula of the abscissa of point A in the oxygen migration line of the sintering process is as follows:

Wherein: θ is the utilization rate of waste energy and waste heat recovery, the unit is %; X' _A represents the amount of oxygen element migrated from iron oxides to carbon oxides in the sintering process after waste energy and waste heat recovery and utilization;

In the process of the waste energy and waste heat recovery and utilization, the combustion of gas will cause oxygen in the air to be brought in, so the ordinate calculation formula of point E is as follows:

为烧结工序中生产单位合格钢铁产品过程回收再利用CO产生的CO₂的量；Wherein: Y' _E represents the amount of migration of the oxygen element combined with iron element in the sintering operation after the waste energy and waste heat recovery and utilization;

It is the amount of _CO2 produced by recycling and reusing CO2 in the production unit of qualified steel products in the sintering process;

The calculation formula of the carbon emission K _{(recovery of waste energy and waste heat)} of the waste energy and waste heat recovery and utilization is as follows:

The following describes the calculation method of carbon emission in the sintering process provided by the present invention with reference to the examples.

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

S1, it is clear that the O element in the sintering process includes the oxygen in the iron oxides of Fe ₂ O ₃ and Fe ₃ O ₄ during the sintering process, and the oxygen in the air during the suction sintering process migrates to CO and CO ₂ in the sintering flue gas The change path of oxygen in the sintering process, the change path of carbon element in the sintering process, including CO in ignition gas and C in carbon-containing fuel combined with oxygen to produce CO ₂ and CO, to collect oxygen and carbon in the sintering process. Element migration and change data; the collected data are shown in Tables 1-5.

Table 1 Sintering raw materials and sintering plant sintering process finished sintered ore iron content (%)

Table 2 The main production indicators and consumption before and after the optimization of the sintering process in the sintering plant

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

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

Table 5 shows the sintered ore yield (%) before and after the optimization of the sintering process in the sintering plant

S2, the migration and change process of oxygen and carbon in the sintering process are plotted in a rectangular coordinate system, the abscissa represents the number of oxygen atoms combined with each carbon atom in the sintering process, and the ordinate represents the sintering process In the process, the amount of oxygen bound to each iron atom migrated to carbon atoms, the oxygen migration coordinate system of the sintering process is constructed; the drawn oxygen migration coordinate system of the sintering process is shown in FIG. 3 .

S3: analyze the migration process of oxygen elements from iron oxides to carbon oxides in the sintering process, the amount of migration is represented by the abscissa X _A of point A, and analyze the migration of oxygen elements combined with iron elements in the sintering process In the process, the amount of migration is represented by the ordinate Y A of point _A and the ordinate Y _E of point E, and the abscissa of point E is defined as 0; the specific process is as follows:

S31: Before optimization, the calculation formula of carbon-containing flue gas _{xi (before optimization)} brought in by the decomposition of the carbon-containing flux is as follows:

After optimization, the calculation formula of the carbon-containing flue gas _{xi (after optimization)} brought in by the decomposition of the carbon-containing flux is as follows:

S32: Before optimization, the calculation formula of the carbon-containing flue gas x _{h (before optimization)} brought in by the combustion of the carbon-containing fuel is as follows:

After optimization, the calculation formula of the carbon-containing flue gas x _{h (after optimization)} brought in by the combustion of the carbon-containing fuel is as follows:

S33: Before the optimization, the calculation formula of the carbon-containing flue gas x _{j (before optimization)} brought in by the electricity consumption of the sintering process for combustion and power generation (before optimization) is as follows:

After optimization, the calculation formula of carbon-containing flue gas x _{j (after optimization)} brought in by electricity consumption in the sintering process for power generation is as follows:

S34: The calculation formula of the carbon-containing flue gas x _g brought in by the ignition gas combustion in the sintering process is as follows:

S35: Before optimization, the calculation formulas of x _{1 (before optimization)} and x _{2 (before optimization)} are as follows:

which is:

which is:

which is:

After optimization, the calculation formulas of x _{1 (after optimization)} and x _{2 (after optimization)} are as follows:

which is:

which is:

which is:

S36: Before optimization, the calculation process of the abscissa X _{A of point A (before optimization)} is as follows:

After optimization, the calculation process of the abscissa of point A X _{A (after optimization)} is as follows:

S37: The calculation formula of the oxygen amount Y _A brought in by the redox of the iron oxide of the sintered ore is as follows:

S38: Before optimization, the calculation formula of the oxygen amount y _{g (before optimization)} brought in by gas combustion in the ignition process in the sintering process is as follows:

After optimization, the calculation formula of the oxygen amount y _{g (after optimization)} brought in by gas combustion in the ignition process in the sintering process is as follows:

S39: Before optimization, the calculation formula of the oxygen amount y _{h (before optimization)} brought in by the combustion of the carbonaceous fuel in the sintering process is as follows:

After optimization, the calculation formula of the oxygen amount y _{h (after optimization)} brought by the combustion of carbonaceous fuel in the sintering process is as follows:

S310: Before optimization, the calculation formula of the oxygen amount _{yi (before optimization)} brought by the carbon-containing flux in the sintering process is as follows:

After optimization, the calculation formula of the oxygen amount _{yi (after optimization)} brought by the carbon-containing flux in the sintering process is as follows:

S311: Before optimization, the calculation formula of the oxygen amount y _{k (before optimization)} brought by the redox of the sintered ore returning iron oxide is as follows:

After optimization, the formula for calculating the amount of oxygen y _{k (after optimization)} brought in by the redox of the sintered ore returning iron oxides is as follows:

S312: Before optimization, the calculation formula of the oxygen amount yj _{(before optimization)} brought in by the air when producing the electricity consumed by the sintering process in the ordinate of point E in the sintering process is as follows:

After optimization, the calculation formula of the oxygen amount y _{j (after optimization)} brought in by the air when producing the electricity consumed by the sintering process in the ordinate of point E in the sintering process is as follows:

S313: Before optimization, Y _{E (before optimization)} for the ordinate of point E is:

Y _{E(before optimization)} =-(y _{g(before optimization)} +y _{h(before optimization)} +y _{i(before optimization)} +y _{k(before optimization)} +y _{j(before optimization} ))

=-(0.0735+0.7757+0.0485+0.0022+0.1978)=-1.0977

After optimization, the ordinate of point E is Y _{E (after optimization)} :

Y _{E(before optimization)} =-(y _{g(before optimization)} +y _{h(before optimization)} +y _{i(before optimization)} +y _{k(before optimization)} +y _{j(before optimization} ))

=-(0.0689+0.6778+0.0445+0.0016+0.1669)=-0.9603

S314: To sum up, 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 counted in Table 6.

Table 6 Comparison of the source and migration of oxygen elements in each link before and after the optimization of the sintering process

S4: Plot the migration and variation of oxygen elements in the sintering process calculated in step S3 in the oxygen migration coordinate system established in step S2, and connect the two points A and E, and draw the oxygen migration line diagram of the sintering process to obtain Calculate the carbon emission K of qualified sintered ore per production unit in the sintering process. The specific process is as follows:

From the carbon emission K _{(before optimization)} value of 221.337, it can be known that the carbon dioxide emission of the qualified sintered ore per production unit in the sintering process is 221.337kg/t.

Further, taking the circulation of iron elements in the long-term production process of iron and steel enterprises as the research object, the carbon emission of the sintering process when producing qualified ton iron products is expressed by K _o , and the calculation formula of K _o is as follows:

From the carbon emission K _o value of 390.917, it can be seen that the carbon dioxide emission in the sintering process of the sinter required to produce a unit of qualified molten iron is 390.917 kg/t.

According to the calculation principle of the oxygen migration line diagram in the sintering process, the oxygen migration line diagram before the optimization of the sintering process is drawn, as shown in Figure 4. It can be seen from Figure 4 that the carbon-containing fuel combustion process in the sintering process releases the largest amount of oxygen, followed by the electrical energy consumed in the sintering process, and the oxygen released by the ignition gas combustion process. Oxygen released by the redox of iron oxides. It can be obtained from the oxygen migration diagram that in the sintering process, the largest carbon emission link is the combustion of carbon fuel. Therefore, it is possible to reduce the carbon emission of the sintering process by optimizing the fuel structure, reducing the fuel ratio; reducing the air leakage rate, etc., to reduce the power consumption; The limiting link of carbon emission in sintering process is the combustion of carbon fuel.

S5: Analyze the impact of process optimization measures on carbon emissions in the sintering process according to the oxygen migration diagram. The specific process is:

Comparing the difference in oxygen migration line before and after the optimization of the amount of carbon-containing flux, electricity, yield and carbon combustion amount in the sintering process, as shown in Figure 5, after the optimization of the sintering process, the amount of carbonate flux required in the sintering process is reduced. ; Reduce the consumption of carbonaceous fuel in the sintering process, which reduces the oxygen content brought from the air during the fuel combustion process; reduces the waste of unused physical and chemical energy due to the return of the ore, optimizes the sintering equipment, and reduces the power consumption of the sintering process. Under the action of multiple factors, the ordinate value of point E finally changed from -1.0977 to -0.9597. It can be seen from Figure 5 that the calculation formula of the total carbon emission K _{(after optimization)} of the sintering process is as follows:

From the carbon emission K _{(after optimization)} value of 209.413, it can be seen that after optimizing the production process, the carbon dioxide emission of qualified sintered ore per production unit is 209.413kg/t, and the optimized sintering process can reduce emissions by 11.92kg/t. carbon dioxide. Correspondingly, in Fig. 5, the slope of the oxygen migration line diagram after the optimization of the sintering process is reduced, and the operation line becomes gentle. The slope of the oxygen migration line is proportional to the carbon emission in the sintering process. Therefore, the oxygen migration from the sintering process The line graph can get the carbon emission reduction of the sintering process.

S51: Reducing the proportion of ore returned in the sintering process is an important measure to reduce the waste of physical and chemical energy due to the ore returning in the sintering process. When the yield of the sintered ore in the sintering process is increased from 75% to 80%, the carbon emission of the sintering process K' Calculated as follows:

From the carbon emission K' value of 207.503, it can be seen that the carbon dioxide emission per unit of qualified sinter produced in the sintering process is 207.503 kg/t after improving the yield of sinter. Compared with before improving the yield, the sintering process can reduce carbon dioxide emission by 13.834kg/t, and the carbon emission is greatly reduced.

S6: The recovery and utilization of waste energy and waste heat is to use waste energy and waste heat for power generation in iron and steel enterprises to replace 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 of the sintering process When the waste heat recovery rate is increased 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:

Further, the waste energy and waste heat recovery converts CO in the sintering flue gas into CO ₂ . At this time, the calculation formula of the abscissa of point A in the oxygen migration line of the sintering process is as follows:

Further, in the process of waste energy and waste heat recovery and utilization, gas combustion will bring oxygen in the air, so the ordinate calculation formula of point E is as follows:

At this time, the calculation formula of carbon emission K _{(recovery of waste energy and waste heat)} is as follows:

From the carbon emission K _{(excess energy and waste heat recovery)} value of 200.72, it can be seen that the carbon dioxide emission of qualified sinter in the production unit of the sintering process is 200.72 kg/t after improving the residual energy and waste heat recovery rate of the sintering process. Compared with the optimization of the sintering process, it can reduce carbon dioxide emissions by 20.62kg/t, and the carbon emissions are greatly reduced.

The oxygen migration lines of the sintering process before optimization and when the residual energy and waste heat recovery rate are 30% are drawn in Figure 6. As shown in Figure 6, increasing the residual energy and waste heat recovery rate will cause the abscissa of point A in the oxygen migration line to shift to the right. , the recovery of excess energy can generate electricity, which is equivalent to reducing the power consumption in the steel production process, which will cause the ordinate of point E to move up, and eventually lead to a decrease in the slope of the oxygen migration line, which means that the carbon consumption per mole of iron is reduced. , that is, the carbon emission of the sintering process is reduced.

To sum up, 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 the consumption of energy and carbonaceous elements in the sintering process by returning ore is added and the remainder is obtained. It can analyze the data of waste heat recovery and utilization, build an oxygen migration coordinate system through the migration and change of oxygen and carbon elements, and draw the oxygen migration line diagram of the sintering process in the oxygen migration coordinate system, and calculate the production in the sintering process according to the oxygen migration line diagram. The carbon emission amount K of a unit of qualified sinter, and the carbon emission amount K _o of the sintering process when producing a unit of qualified ton of iron products. 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 clearly defined, the restrictive links to reduce carbon emissions can be pointed out, and reasonable and executable The carbon emission optimization scheme with high performance is a simple calculation and analysis method with easy data acquisition, visualization of calculation results, and high executable carbon emission optimization scheme. Quantity has important guiding significance. At the same time, the sintering process is associated with the whole process of iron and steel production, which is convenient for the economic accounting of iron and steel enterprises.

The above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced. Without departing from the spirit and scope of the technical solutions of the present invention.

Claims (10)

1. A method for calculating carbon emission in a sintering process is characterized by comprising the following steps:

s1, collecting migration and change data of oxygen and carbon elements in the sintering process based on the physicochemical reaction among Fe-O-C in the sintering process, wherein the data comprises analysis data of energy and carbon element loss in the sintering process caused by return ores and waste heat recycling analysis data of residual energy;

s2, constructing an oxygen migration coordinate system of the sintering process, and drawing an oxygen migration diagram of the sintering process in the oxygen migration coordinate system;

s3, calculating and obtaining the carbon emission K of the sintering ore which is qualified in the production unit in the sintering process and the carbon emission K of the sintering process when the iron product is qualified in the production unit ton according to the oxygen mobility diagram _ο 。

2. The method for calculating carbon emission in a sintering process according to claim 1, wherein: and analyzing the influences of the optimization of the parameters of the sintering process, outsourcing clean power and the recovery of residual energy waste heat on an oxygen migration line and the carbon emission K according to the oxygen migration diagram, thereby evaluating the process parameters of the sintering process, and guiding to select the optimal process parameters of the sintering process with the lowest carbon emission for process optimization.

3. The method for calculating carbon emission in a sintering process according to claim 1, wherein:

in step S1, before collecting data on migration and change of oxygen and carbon elements in the sintering process, it is determined that the O element in the sintering process includes Fe during the sintering process ₂ O ₃ And Fe ₃ O ₄ Oxygen in the iron oxide, and oxygen in the air draft sintering process are transferred to CO and CO in the sintering flue gas ₂ The element C in the sintering process comprises CO in ignition gas and C in carbon-containing fuel combined with oxygen to produce CO ₂ And the path of change of carbon element in the case of CO;

in step S2, the oxygen transition line is constructed in a manner that: drawing the migration and change processes of oxygen and carbon in the sintering process in a rectangular coordinate system, wherein the abscissa represents the number of oxygen atoms bound to each carbon atom in the sintering process, and the ordinate represents the migration amount of oxygen bound to each iron atom to the carbon atoms in the sintering process, so as to construct an oxygen migration coordinate system of the sintering process;

the drawing mode of the oxygen migration diagram is as follows: analyzing the migration process of oxygen from the iron oxide to the carbon oxide in the sintering process, and using the abscissa X of the point A to determine the migration amount _A The method is characterized in that the migration process of oxygen combined with iron element in the sintering process is analyzed, and the migration amount is represented by the ordinate Y of the point A _A And E point ordinate Y _E Representing that the abscissa of the point E is defined as 0; and drawing the point A and the point E in the oxygen migration coordinate system established in the step S2 according to the coordinates of the point A and the point E, connecting the point A, E, and drawing an oxygen migration line graph of the sintering process.

4. The method of calculating carbon emissions from a sintering process of claim 3, wherein: in step S1, the migration and change data of the oxygen element in the sintering process includes oxygen source data, specifically including oxygen amount introduced by oxidation reduction of iron element, oxygen amount introduced by combustion of coal gas during ignition, oxygen amount introduced by combustion of carbonaceous fuel in the sintering process, oxygen amount introduced by carbonaceous flux, oxygen amount introduced by oxidation reduction of sintered return ores, and oxygen amount introduced by air when electric quantity consumed in the production sintering process is consumed; in addition, the migration and change data of the oxygen element in the sintering process also comprises migration data of oxygen, specifically comprising CO and CO in the sintering flue gas ₂ Content, CO produced by electric energy consumed by the sintering process ₂ Content, amount of gas to be consumed for producing unit agglomerate; the data of the sintering process comprise TFe content and Fe in iron ore ₂ O ₃ Content, Fe ₃ O ₄ Content (c); the sinter yield; TFe content, Fe in finished sintered ore ₂ O ₃ Content of Fe ₃ O ₄ Content (c); qualified sinter yield, and carbon content of the carbon-containing fuel.

5. The method for calculating carbon emission in a sintering process according to claim 3, wherein: 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, which is converted into the consumption of unit finished sintered ore.

6. The method of calculating carbon emissions from a sintering process of claim 3, wherein: the abscissa X of the point A _A And ordinate Y _A The calculation formula of (c) is as follows:

wherein: x is the number of _i The unit is mol of carbon-containing flue gas brought by decomposition of carbon-containing flux in sintering flue gas; x is a radical of a fluorine atom _h The unit is mol of carbon-containing flue gas brought by the combustion of carbon-containing fuel in the sintering flue gas; x is the number of _g The unit is mol of carbon-containing flue gas brought by burning of ignition gas in sintering flue gas; x is the number of _j The unit is mol of carbon-containing flue gas brought by combustion power generation in the sintering flue gas; x is a radical of a fluorine atom ₁ The carbon is the mass percentage of completely combusted carbon in the solid fuel, and the unit is;

carbon-containing flue gas x brought by the decomposition of the carbon-containing flux _i The calculation formula of (c) is as follows:

wherein: u shape _fs The unit is kg/t for the consumption of carbon-containing flux for producing sintered ore of unit mass;

the calcium carbonate is the mass percentage of the calcium carbonate in the flux, and the unit is; beta is CaCO ₃ The decomposition rate of (d) in units of%;

carbon-containing flue gas x brought by combustion of the carbon-containing fuel _h The calculation formula of (a) is as follows:

wherein: u shape _rs The unit is kg/t for producing the consumption of solid fuel of sintered ore of unit mass; p _c The carbon element is the mass percentage of the carbon element in the solid fuel coal powder, and the unit is;

the carbon-containing flue gas x brought by combustion power generation in the sintering process _j The calculation formula of (a) is as follows:

wherein: u shape _ES The unit of the consumed electric quantity is kWh/t for producing the sintered ore with unit mass; k is the molar amount of carbon consumed per degree of electricity produced, in mol/kWh;

the carbon-containing flue gas x brought by the combustion of the ignition gas _g The calculation formula of (a) is as follows:

wherein: v _is The amount of gas consumed in the ignition process to produce a unit mass of sinter in m ³ /t；

The percentage content of CO in the consumed ignition gas is expressed in unit;

wherein: w (Fe) ₂ O ₃ ) _O Represents Fe in iron ore ₂ O ₃ The content; w (FeO) _O Represents the FeO content in the iron ore; w (TFe) _O Represents the TFe content in the iron ore; w (Fe) ₂ O ₃ ) _S Denotes Fe in the finished sinter ₂ O ₃ The content; w (FeO) _S Representing the FeO content in the finished sintered ore; w (TFe) _S Showing the content of TFe in the finished sintered ore.

7. The method of calculating carbon emissions from a sintering process of claim 6, wherein: said X _A The mass percentage of the carbon of the solid fuel in the calculation formula is x ₁ Expressed as mass percent of carbon from incomplete combustion of solid fuel by x ₂ Denotes x ₁ And x ₂ The calculation formula of (a) is as follows:

wherein:

the percentage content of CO in the sintering flue gas is shown in unit;

for CO in sintering flue gas ₂ In% by weight;

for CO in consumed ignition gas ₂ In% by weight;

is the percentage of CO in the consumed ignition gas in%.

8. The method of calculating carbon emissions from a sintering process of claim 3, wherein: the abscissa Y of the point E _E The calculation formula of (c) is as follows:

Y _E ＝-(y _g +y _h +y _i +y _j +y _k )

wherein: y is _g Is the midpoint of the sintering processOxygen brought by combustion of the gas during the fire; y is _h The oxygen amount brought by the combustion of the carbon-containing fuel in the sintering process; y is _i The oxygen amount brought by the carbon-containing flux in the sintering process; y is _k Oxygen amount brought by oxidation reduction of sintering return ores in a sintering process; y is _j Oxygen amount brought by air when electric quantity consumed by a sintering process is produced;

oxygen y brought by gas combustion in the ignition process in the sintering process _g The calculation formula of (a) is as follows:

wherein: n (Fe) is the amount of iron element in mol; m is the yield of qualified sinter, and the unit is kg;

the yield of the sinter is expressed in unit;

the amount y of oxygen brought by the combustion of the carbonaceous fuel in the sintering process _h The calculation formula of (c) is as follows:

the oxygen amount y brought by the carbon-containing flux in the sintering process _i The calculation formula of (a) is as follows:

the oxygen y brought by oxidation reduction of the sintering return ores in the sintering process _k The calculation formula of (a) is as follows:

large power consumption in the sintering processPartially obtained by heat release from the combination of C and O in thermal power generation, and the amount y of oxygen introduced from the air when the amount of electricity consumed in the sintering step is produced in the ordinate of the point E in the sintering step _j The calculation formula of (c) is as follows:

。

9. the method for calculating carbon emission in a sintering process according to claim 1, wherein: the carbon emission amount of the qualified sintered ore of the production unit in the sintering process is represented by K value, and the calculation formula of K is as follows:

furthermore, the circulation of iron element in the long production flow of iron and steel enterprises is taken as a research object, and K for analyzing the carbon emission of the sintering process in the production of qualified ton of iron products is used _o Is represented by K _o The calculation formula of (a) is as follows:

。

10. the method for calculating carbon emission in a sintering process according to claim 2, wherein: the recovery and utilization of the residual energy and the waste heat are realized by recovering the residual energy and the waste heat for power generation of iron and steel enterprises so as to replace electric energy generated by carbon combustion to reduce the carbon emission, the whole process does not relate to the reduction of iron oxide, and the ordinate of the point A in an oxygen migration line of a sintering process is unchanged:

wherein: y' _A Indicate the remaining energyThe amount of migration of oxygen bonded to iron in the post-sintering step of heat recovery;

converting CO in the sintering flue gas into CO in the process of recovering and utilizing the residual energy and the waste heat ₂ In this case, the formula for calculating the abscissa of the point a in the oxygen transition line in the sintering step is as follows:

wherein: theta is the residual energy and waste heat recovery utilization rate, and the unit is; x' _A The amount of oxygen element transferred from the iron oxide to the carbon oxide in the sintering process after the recovery and utilization of residual energy and waste heat are carried out is shown;

in the residual energy waste heat recycling process, oxygen in the air can be brought in by the combustion of the gas, so that the ordinate calculation formula of the point E is as follows:

wherein is Y' _E Represents the amount of migration of oxygen bonded to iron in the sintering step after recovery and utilization of residual energy and heat;

CO generated by recycling and reusing CO in the process of producing qualified steel products in production units in the sintering process ₂ The amount of (c);

carbon emission K for recovering and utilizing waste heat of residual energy _{(complementary energy waste heat recovery)} The calculation formula of (c) is as follows:

。

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