An evaluation method for fuel combustion performance based on sintered quasi-particles

Abstract

A method for evaluating the combustion performance of fuel in sintered quasi-particles is disclosed, relating to the field of iron and steel metallurgy. This method involves sampling and sieving the fuel of the type to be evaluated, preparing different types of quasi-particles based on particle size, and conducting quasi-particle combustion experiments. The experimental data are weighted and averaged based on the fuel particle size distribution to obtain efficiency values ​​for different combustion performances of the fuel. The fuel combustion performance is then evaluated based on these efficiency values. Since different particle sizes of fuel will form different types of quasi-particles during the secondary mixing process, different types of quasi-particles are designed according to the fuel particle size during preparation. Various indicators of the fuel within the quasi-particles are analyzed, which can simultaneously simulate the actual combustion environment of sintered quasi-particles and differentiate the combustion performance of different types of fuel. This is of great significance for reducing sintering costs and minimizing the combustion of sintered solids.

Description

Technical Field

[0001] This invention relates to the field of iron and steel metallurgy technology, and specifically to an evaluation method for the combustion performance of fuel in sintered quasi-particles. Background Technology

[0002] The iron ore sintering process involves the melting and agglomeration of ore, flux, and other materials through fuel combustion, followed by cooling and crystallization. This process involves the combustion and reduction reactions of sintering fuels such as coke powder, pulverized coal, and semi-coke, releasing large amounts of environmental pollutants such as CO2 and CO into the atmosphere with the sintering flue gas. Different fuel types and particle size distributions, along with variations in fuel usage and the degree of incomplete combustion, result in significant amounts of CO being released into the atmosphere without secondary combustion, leading to differences in fuel combustion performance. Currently, there are no specific evaluation indicators or systems for assessing the combustion performance of fuels in sintered granules. Given the diverse types of sintering fuels with uneven particle size distributions and significant differences in combustion performance, using a series of fuel performance testing indicators and results that more closely resemble actual sintering production to determine the combustion status and efficiency of fuels in the sintering environment would not only make it easier for companies to determine the optimal sintering fuel type but also reduce the risk of solid combustion during sintering and decrease CO and SO2 emissions in the flue gas. x NO x This is of great significance in addressing the pressure of end-of-pipe treatment of gaseous pollutants.

[0003] The relevant patents concerning performance evaluation indicators for sintered fuels are as follows:

[0004] Invention patent CN113868851A discloses a method for establishing and applying a comprehensive evaluation model for solid fuels used in sintering. This comprehensive evaluation model calculates the fuel evaluation characteristic value K of a predetermined type and proportion of solid fuel formulation, and compares and analyzes the magnitude of the K value to quantitatively evaluate the advantages and disadvantages of different fuel formulation schemes. It has important guiding significance for the selection and optimization of fuel types and proportions in on-site sintering production.

[0005] Invention patent CN113930558A discloses an effective method for determining the proportion of waste activated carbon powder to replace sintering fuel. In the process of using waste activated carbon powder to replace anthracite, coke powder and other sintering fuels, this method comprehensively considers the influence of fixed carbon content and particle size, determines the optimal replacement ratio, meets the requirements of blast furnace for fuel, and achieves a high sintering rate.

[0006] Invention patent CN114350936A discloses a method for reducing sintering solid fuel consumption by controlling fuel particle size. This method achieves the goal of reducing sintering solid fuel consumption by reasonably controlling the particle size composition of the fuel used in sintering to be consistent with the particle size composition of the iron ore powder used, while ensuring that the quality indicators of sintered ore are qualified. This reduces carbon dioxide emissions while reducing fossil energy consumption, resulting in significant economic and social benefits.

[0007] Invention patent CN115660284A discloses a method for evaluating the use of sintering fuels. By calculating the fuel consumption per ton of ore and the fixed carbon consumption of various fuels, the cost-effectiveness of fuels is determined based on the prices of various fuels, which guides raw material procurement and effectively reduces the fuel procurement costs of enterprises.

[0008] The aforementioned patent literature contains numerous and in-depth studies on the establishment of evaluation models for sintered fuels, optimization of feedstock formulations, and fuel economy, yielding certain research results. However, in actual sintering production, fuel is distributed among different types of quasi-particles based on particle size, resulting in varying combustion environments and thus affecting fuel combustion performance. Further research is needed to refine how to determine a series of sintered fuel evaluation systems based on the actual quasi-particle distribution to assess fuel combustion performance.

[0009] Therefore, there is an urgent need to invent a sintering fuel combustion performance evaluation method that is closer to the actual sintering production, more operable, and can effectively determine the combustion behavior of sintering fuels. This is of great significance for reducing sintering costs and reducing the combustion of sintering solids. Summary of the Invention

[0010] The purpose of this invention is to address the shortcomings and defects of existing technologies by providing a method for evaluating the combustion performance of fuels in sintered quasi-particles. This method involves sampling and sieving the fuel of the type to be evaluated, preparing different types of quasi-particles based on particle size, and conducting quasi-particle combustion experiments. The experimental data are weighted and averaged based on the fuel particle size ratio to obtain efficiency values ​​for different combustion performances of the fuel. The fuel combustion performance is then evaluated based on these efficiency values. Since different particle sizes of fuel will form different types of quasi-particles during the secondary mixing process, different types of quasi-particles are designed according to the fuel particle size during preparation. Various indicators of the fuel in the quasi-particles are analyzed, which can simultaneously simulate the actual combustion environment of sintered quasi-particles and differentiate the combustion performance of different types of fuels. This is of great significance for reducing sintering costs and minimizing the combustion of sintered solids.

[0011] To achieve the above objectives, the present invention adopts the following technical solution: an evaluation method for the combustion performance of fuel in sintered quasi-granules, comprising the following specific steps: Before blending different fuels, samples are taken for industrial analysis and combustion performance testing to determine whether they meet the standards for sintering production fuels. After screening out fuels that meet the sintering production standards, the original particle size is sampled for particle size sieving, and the mass percentage of fuels with different particle sizes is recorded. Single fuel samples are sampled for particle size sieving, and samples of different particle sizes are categorized and sampled. For fuel samples of different particle sizes, they are mixed with pure Al2O3 reagent and water is added to prepare different types of quasi-granules. A combustion experiment is conducted on the samples using a tube furnace for heating. After the combustion experiment, evaluation indicators are determined based on the experimental results. A total of four evaluation indicators are set to evaluate the fuel combustion performance: combustion efficiency, combustion rate, calorific value, and burnout degree.

[0012] Furthermore, the industrial analysis and combustion performance testing specifically include data on moisture, ash, volatile matter, fixed carbon content, and overall combustion index.

[0013] Furthermore, the particle size sieving test can be divided into four particle size distributions for fuel samples: <1mm, 1-2mm, 2-3mm, and >3mm.

[0014] Furthermore, the different types of quasi-particles are classified into three types: S-type, C-type, and P-type, based on the morphology of fuel occurrence in the quasi-particles. Different types of quasi-particle samples are prepared from fuels of different particle sizes.

[0015] Furthermore, for quasi-particle samples with a particle size of <1 mm, P-type quasi-particles with a diameter of 4 mm were prepared with pure Al2O3 reagent; for quasi-particle samples with a particle size of 1-2 mm, half were prepared with pure Al2O3 reagent to form C-type quasi-particles with a diameter of 4 mm, and the other half were prepared with pure Al2O3 reagent to form P-type quasi-particles with a diameter of 4 mm; for quasi-particle samples with a particle size of 2-3 mm, half were prepared with pure Al2O3 reagent to form C-type quasi-particles with a diameter of 4 mm, and the other half were selected from samples with a diameter of about 3 mm to form S-type quasi-particles; for quasi-particle samples with a particle size of >3 mm, samples with a diameter of about 4 mm were selected to form S-type quasi-particles.

[0016] Furthermore, to ensure the strength of the quasi-particles, the pure Al2O3 reagent with a particle size between 0.1 and 0.2 mm is selected.

[0017] Furthermore, the aforementioned tube furnace structure involves placing an electronic scale capable of recording weight in real time on top of the tube furnace, with a tray placed below to support different quasi-particle samples. A thermocouple is installed above the tray to measure the gas temperature in real time. Corundum balls are installed at the bottom of the furnace tubes to preheat the air, and a flue gas analyzer is installed at the top of the furnace tubes to record flue gas data in real time.

[0018] Furthermore, the combustion experiment involves placing different quasi-particle samples into a tube furnace via trays, introducing N2 at a flow rate of 5 L / min to prevent combustion of the fuel, heating the tube furnace to 1273 K, maintaining the temperature for 30 minutes, and then starting the experiment. The 5 L / min N2 is then converted to 5 L / min compressed air to initiate combustion and increase the temperature of the fuel. During the experiment, changes in flue gas temperature, fuel combustion time, changes in gas composition, and the quasi-particle weight loss rate are recorded.

[0019] Furthermore, the combustion efficiency, combustion rate, calorific value, and degree of burnout are specifically defined as follows: for the fuel combustion efficiency, the efficiency is measured by the change in gas composition during the fuel combustion time. The specific measurement method is as follows: the combustion start time t... s until combustion ends (t) d The average ratio of CO to CO2 gas concentrations during the combustion period is used as the fuel combustion efficiency evaluation value. The fuel combustion rate is determined by the fuel combustion time and the quasi-particle weight loss rate. Specifically, the determination method is as follows: [The text abruptly ends here, likely due to an incomplete sentence or missing information.] s until combustion ends (t) d The average quasi-particle weight loss rate during the period was used as the fuel combustion rate evaluation value; the calorific value of the fuel combustion was determined by the change in flue gas temperature during the experiment, specifically by measuring the combustion start time t. s until combustion ends (t) d The total calorific value of fuel combustion during the combustion time is determined by integrating the flue gas temperature rise during the combustion period, and the combustion start time t is used as the starting point. s until combustion ends (t) d The highest point of flue gas temperature was marked during the experiment to determine the highest temperature value within the combustion time. The degree of fuel burnout was measured by the quasi-particle weight loss rate during the experiment. The specific measurement method was as follows: [The text abruptly shifts to a different topic] ...at the combustion start time t... s until combustion ends (t) d The total weight loss m of the quasi-particles during the period was recorded, and the degree of fuel burnout was determined by the ratio of the total weight loss m to the total fixed carbon m0 inside the quasi-particles.

[0020] The beneficial effects of this invention after adopting the above technical solution are as follows: This method samples and sieves the fuel of the type to be evaluated, and prepares different types of quasi-particles according to the particle size to conduct quasi-particle combustion experiments. The experimental data are weighted and averaged based on the proportion of fuel particle size to obtain the efficiency value of different combustion performances of the fuel. The fuel combustion performance is evaluated based on the efficiency value. Since different particle sizes of fuel will form different types of quasi-particles during the secondary mixing process, different types of quasi-particles are designed according to the fuel particle size when preparing quasi-particles. Various indicators of fuel in quasi-particles are analyzed. This can simultaneously simulate the actual combustion environment of sintered quasi-particles and distinguish the combustion performance of different types of fuels. This is of great significance for reducing sintering costs and reducing the combustion of sintered solids. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is an experimental flowchart of the present invention.

[0023] Figure 2 This is a schematic diagram of the three types of quasi-particles in this invention. Detailed Implementation

[0024] See Figures 1-2 As shown, the technical solution adopted in this specific embodiment includes the following specific steps:

[0025] S1 requires that different fuels be sampled for industrial analysis and combustion performance testing before blending to determine whether they meet the standards for sintering production fuels. After screening out fuels that meet the sintering production standards, the original particle size of the samples is sampled for particle size sieving testing (which can be divided into four particle size distributions: <1mm, 1-2mm, 2-3mm, and >3mm). The mass percentage of fuels with different particle sizes is recorded. The specific analytical data for industrial analysis and combustion performance testing include moisture, ash, volatile matter, fixed carbon content, and comprehensive combustion index.

[0026] S2 involves sampling a single type of fuel sample for particle size sieving and classifying samples of different particle sizes.

[0027] S3. For fuel samples with different particle sizes, mix them with pure Al2O3 reagent. To ensure the strength of the quasi-particles, select pure Al2O3 reagent with a particle size between 0.1-0.2 mm. Add water to prepare different types of quasi-particles. For different types of quasi-particles, see [link to documentation]. Figure 2As shown, based on the morphology of fuel in quasi-particles, they are classified into three types: S-type, C-type, and P-type. Different types of quasi-particle samples were prepared from fuels of different particle sizes.

[0028] For quasi-particle samples with a particle size of <1 mm, P-type quasi-particles with a diameter of 4 mm were prepared with pure Al2O3 reagent;

[0029] For quasi-particle samples with a particle size of 1-2 mm, half were prepared into 4 mm diameter C-type quasi-particles with pure Al2O3 reagent, and the other half were prepared into 4 mm diameter P-type quasi-particles with pure Al2O3 reagent.

[0030] For quasi-particle samples with a particle size of 2-3 mm, half were prepared into 4 mm diameter C-type quasi-particles with pure Al2O3 reagent, and the other half were selected from samples with a diameter of about 3 mm to prepare S-type quasi-particles.

[0031] For quasi-particle samples with a particle size >3mm, samples with a diameter of about 4mm are selected to prepare S-shaped quasi-particles.

[0032] S4. Heating is performed using a tube furnace. The tube furnace structure consists of an electronic scale equipped with real-time weight recording placed on top of the furnace, a tray placed below to support different quasi-particle samples, a thermocouple above the tray to measure the gas temperature in real time, corundum balls at the bottom of the furnace tube for preheating the air, and a flue gas analyzer at the top of the furnace tube for real-time recording of flue gas data. A combustion experiment is then conducted on the samples. In this experiment, different quasi-particle samples are placed into the tube furnace through the tray, and N2 at a flow rate of 5 L / min is introduced to prevent the fuel from undergoing a combustion reaction. The tube furnace is heated to 1273 K and held at that temperature for 30 minutes before the experiment begins. The 5 L / min N2 is then converted to 5 L / min compressed air to initiate combustion and increase the temperature of the fuel. During the experiment, changes in flue gas temperature, fuel combustion time, gas composition changes, and quasi-particle weight loss rate are recorded.

[0033] S5. After the combustion experiment, evaluation indicators were determined based on the experimental results. Four evaluation indicators were set to evaluate fuel combustion performance: combustion efficiency, combustion speed, calorific value, and burnout degree. Specifically, combustion efficiency, combustion speed, calorific value, and burnout degree are as follows:

[0034] The fuel combustion efficiency is determined by the change in gas composition during the fuel combustion time. The specific determination method is as follows: the average value of the gas concentration ratio of CO to CO2 in the flue gas from the start time ts to the end time td of combustion is used as the fuel combustion efficiency evaluation value.

[0035] The fuel combustion rate is determined by the fuel combustion time and the quasi-particle weight loss rate. Specifically, the determination method is as follows: The combustion start time t...s until combustion ends (t) d The average quasi-particle weight loss rate during the period is used as the evaluation value of fuel combustion rate;

[0036] The calorific value of the fuel combustion was determined by the change in flue gas temperature during the experiment. Specifically, the measurement method was as follows: from the combustion start time ts to the combustion end time t... d The total calorific value of fuel combustion during the combustion time is determined by integrating the flue gas temperature rise during the combustion period, and the combustion start time t is used as the starting point. s until combustion ends (t) d The point where the flue gas temperature is highest is marked during the combustion period to determine the highest temperature value.

[0037] The degree of fuel burnout was determined by the quasi-particle weight loss rate during the experiment. The specific method was as follows: [The text abruptly shifts to a different topic] ...the combustion start time t... s until combustion ends (t) d The total weight loss m of the quasi-particles during the period was recorded, and the degree of fuel burnout was determined by the ratio of the total weight loss m to the total fixed carbon m0 inside the quasi-particles.

[0038] The following are the specific experimental methods and data in this embodiment:

[0039] In this embodiment, particle size sieving, mixing and granulation, combustion experiments, combustion performance evaluation, and combustion performance scoring of the three fuels (A, B, and C) were carried out according to the above steps. The types and particle size distribution of the fuels used in the experiment are shown in Table 1.

[0040]

[0041]

[0042] Table 1: Fuel Types and Particle Size Composition

[0043] 1. Experimental Procedure

[0044] For three different fuels, granulation was performed based on the quasi-particle size, and the fuel's morphology within the quasi-particles was categorized as follows: Figure 2 The diagram shows three types of quasi-particles: S-type, C-type, and P-type. For quasi-particle samples with a particle size <1 mm, P-type quasi-particles with a diameter of 4 mm were prepared using pure Al2O3 reagent. For quasi-particle samples with a particle size of 1-2 mm, half were prepared into C-type quasi-particles with a diameter of 4 mm using pure Al2O3 reagent, and the other half were prepared into P-type quasi-particles with a diameter of 4 mm using pure Al2O3 reagent. For quasi-particle samples with a particle size of 2-3 mm, half were prepared into C-type quasi-particles with a diameter of 4 mm using pure Al2O3 reagent, and the other half were selected from samples with a diameter of approximately 3 mm to prepare S-type quasi-particles. For quasi-particle samples with a particle size >3 mm, samples with a diameter of approximately 4 mm were selected to prepare S-type quasi-particles.

[0045] Nine different types of quasi-particles were placed in a tube furnace for combustion experiments. N2 at a flow rate of 5 L / min was introduced to prevent the fuel from undergoing a combustion reaction. The tube furnace was heated to 1273 K and held at that temperature for 30 minutes before the experiment began. The N2 at a flow rate of 5 L / min was converted to compressed air at a flow rate of 5 L / min to initiate combustion and increase the temperature of the fuel. During the experiment, the changes in flue gas temperature, fuel combustion time, changes in gas composition, and the quasi-particle weight loss rate were recorded.

[0046] For fuel sample data, fuel combustion efficiency analysis is performed. Efficiency is determined by the changes in gas composition during the fuel combustion time. The specific measurement method is as follows: The efficiency is measured at the combustion start time t. s until combustion ends (t) d The average ratio of CO to CO2 gas concentrations during the period is used as the evaluation value for fuel combustion efficiency.

[0047] For fuel sample data, fuel combustion rate analysis was performed, measured by fuel combustion time and quasi-particle weight loss rate. The specific measurement method was as follows: [The text abruptly shifts to a different topic] ...combustion start time t... s until combustion ends (t) d The average quasi-particle weight loss rate during the period is used as the evaluation value of fuel combustion rate.

[0048] For the fuel sample data, the calorific value of fuel combustion was analyzed by measuring the change in flue gas temperature during the experiment. The specific measurement method was as follows: the combustion start time t was... s until combustion ends (t) d The total calorific value of fuel combustion during the combustion time is determined by integrating the flue gas temperature rise during the combustion period, and the combustion start time t is used as the starting point. s until combustion ends (t) d The point where the flue gas temperature is highest during the combustion period is marked to determine the highest temperature value.

[0049] For the fuel sample data, fuel burnout analysis was performed by measuring the quasi-particle weight loss rate during the experiment. The specific measurement method was as follows: [The text abruptly shifts to a different topic] ...combustion start time t... s until combustion ends (t) d The total weight loss m of the quasi-particles during the period was recorded, and the degree of fuel burnout was determined by the ratio of the total weight loss m to the total fixed carbon m0 inside the quasi-particles.

[0050] 2. Experimental Results and Analysis

[0051] The combustion efficiency analysis results for the nine types of fuel pellets are shown in Table 2. Due to the different types of fuels, the combustion efficiency varies considerably during combustion. For P-type pellets, the combustion efficiency is above 0.80, with fuel A having the highest efficiency among the three types. For C-type pellets, the combustion efficiencies of the three fuels are basically consistent, all above 0.95. For S-type pellets, the combustion efficiency varies considerably, with fuel C having the lowest efficiency and fuel A having the highest. Overall, fuel A has a higher combustion efficiency and better combustion effect.

[0052]

[0053] Table 2: Analysis results of quasi-particle combustion efficiency of nine fuels (unit: %)

[0054] The calorific value analysis results for the nine types of fuel quasi-particles are shown in Table 3. For P-type quasi-particles, the calorific value is consistently above 400 K·S / 10⁻⁶. 3 Of the three fuels, fuel A has the highest calorific value. In type C semi-particle fuels, the calorific values ​​of the three fuels are also basically the same, all around 450 K·S / 10⁻⁶. 3 In the above, among the S-shaped quasi-particles, the calorific value varies considerably, with fuel C having the lowest calorific value and fuel A having the highest. Overall, fuel A has a higher calorific value and better combustion performance.

[0055]

[0056] Table 3: Calorific Value Analysis Results of Nine Types of Particle Fuel (Unit: K·S / 10) 3 )

[0057] The analysis results of the maximum temperature and combustion rate of the nine types of fuel quasi-particles are shown in Table 4-5. Among the P-type quasi-particles, fuel A has the lowest combustion temperature but a longer combustion time, while fuel C has a higher combustion temperature but a shorter combustion time. Among the C-type quasi-particles, the three fuels are basically the same, with a maximum combustion temperature of around 1400K and a combustion rate of around 120s. The S-type quasi-particles are similar to the P-type quasi-particles, with fuel A having the lowest combustion temperature but a longer combustion time, while fuel C has a higher combustion temperature but a shorter combustion time. Overall, fuel A has a better combustion effect, but fuel C has a higher combustion temperature.

[0058]

[0059] Table 4: Analysis results of the highest combustion temperature of quasi-particle fuels for nine types of fuels (unit: K)

[0060]

[0061] Table 5: Analysis results of quasi-particle combustion rates for nine fuels (unit: s)

[0062] The results of the analysis of the burnout of the nine types of fuel particles are shown in Table 6. Overall, although fuel A has a better combustion effect, its burnout is poor due to its slow combustion rate and low maximum temperature. Although fuel C has a poor combustion effect, its burnout is better due to its fast combustion rate and high maximum temperature.

[0063]

[0064] Table 6. Analysis results of burnout degree of 9 fuels (unit: S)

[0065] Analysis of experimental results on the combustion performance of three fuels revealed that while fuel A exhibited better combustion, its slow combustion rate and low maximum temperature resulted in poorer overall burnout. Fuel C, despite having poorer combustion, had a faster combustion rate and higher maximum temperature, leading to better overall burnout. Overall, fuel A was the optimal fuel with the best comprehensive combustion performance, followed by fuel B, and then fuel C.

[0066] The above description is only used to illustrate the technical solution of the present invention and is not intended to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solution of the present invention, as long as they do not depart from the spirit and scope of the technical solution of the present invention, should be covered within the scope of the claims of the present invention.

Claims

1. A method for evaluating the combustion performance of a fuel based on sintered quasi-particles, characterized by: It comprises the following specific steps: S1, requiring different fuels to be sampled for industrial analysis and combustion performance detection before blending, to determine whether they meet the sintering production fuel standard, and to screen out fuels that meet the sintering production standard, then sample the original particle size for particle size screening detection, and record the mass percentage of fuels under different particle sizes; S2, particle size screening of single fuel samples, and classification sampling of different particle size samples; S3, for fuel samples of different particle sizes, mix uniformly with Al2O3 pure reagent, and add water to prepare different types of quasi-particles: For <1mm particle size quasi-particle samples, prepare 4mm diameter P-type quasi-particles with Al2O3 pure reagent; For 1-2mm particle size quasi-particle samples, half of them are prepared into 4mm diameter C-type quasi-particles with Al2O3 pure reagent, and the other half are prepared into 4mm diameter P-type quasi-particles with Al2O3 pure reagent; For 2-3mm particle size quasi-particle samples, half of them are prepared into 4mm diameter C-type quasi-particles with Al2O3 pure reagent, and the other half are selected to prepare S-type quasi-particles with a diameter of about 3mm; For >3mm particle size quasi-particle samples, select samples with a diameter of about 4mm to prepare S-type quasi-particles; S4, use a tube furnace to heat and raise the temperature, and conduct a combustion experiment on the samples; S5, after the combustion experiment, evaluate the indicators based on the experimental data, a total of 4 evaluation indicators are set for evaluating the combustion performance of the fuel, the evaluation indicators are: combustion efficiency, combustion speed, combustion heat value, and burnout degree, the experimental data is weighted and averaged based on the fuel particle size ratio, to obtain the efficiency value of the different combustion performance of the fuel, and the combustion performance of the fuel is evaluated according to the efficiency value; the combustion efficiency, combustion speed, combustion heat value, and burnout degree are as follows: For the fuel combustion efficiency, the efficiency is determined by the change of the gas composition during the fuel combustion time, and the specific determination method is: taking the average value of the gas concentration ratio of CO to CO2 of the flue gas composition during the combustion start time t s to the combustion end time t d as the fuel combustion efficiency evaluation value; For the fuel burning rate, the average value of the quasi-particle weight loss rate during the period from the start time t s to the end time t d of the burning is measured as the evaluation value of the fuel burning rate. For the fuel combustion heat value, the temperature change of the flue gas during the experiment is measured, specifically, the temperature rise amount of the flue gas during the time period from the combustion start time t s to the combustion end time t d is integrated to determine the total fuel combustion heat value in the combustion time, the highest temperature point of the flue gas during the time period from the combustion start time t s to the combustion end time t d is marked to determine the highest temperature value in the combustion time. For the fuel burnout degree, the quasi-particle weight loss rate during the experiment is measured, and the specific measurement method is: the quasi-particle weight loss total amount m during the time period from the combustion start time t s to the combustion end time t d is recorded, and the fuel burnout degree is determined by the ratio of the weight loss total amount m to the total amount of fixed carbon m0 of the fuel in the quasi-particle.

2. The method for evaluating the combustion performance of a fuel based on sintered quasi-particles according to claim 1, characterized by: The industrial analysis and combustion performance detection in S1, the analysis data are moisture content, ash content, volatile powder content, fixed carbon content, and comprehensive combustion index.

3. The method for evaluating the combustion performance of a fuel based on sintered quasi-particles according to claim 1, characterized by: The particle size screening detection in S1 can be divided into <1mm, 1-2mm, 2-3mm, and >3mm four particle size distribution fuel samples.

4. The method for evaluating the combustion performance of a fuel based on sintered quasi-particles according to claim 1, characterized by: The different types of quasi-particles in S3 are divided into S-type, C-type, and P-type quasi-particles according to the occurrence form of the fuel in the quasi-particles, and different particle size fuels are prepared into different types of quasi-particle samples.

5. The method for evaluating the combustion performance of a fuel based on sintered quasi-particles according to claim 1, characterized by: In S3, to ensure the strength of the quasi-particles, Al2O3 pure reagent with a particle size of 0.1-0.2mm is selected.

6. The method for evaluating the combustion performance of a fuel based on sintered quasi-particles according to claim 1, characterized by: The structure of the tube furnace in S4 is that an electronic scale capable of recording weight in real time is placed at the top of the tube furnace, a tray is placed at the bottom to hold different quasi-particle samples, a thermocouple is placed above the tray to measure the gas temperature in real time, corundum balls are placed at the lower part of the furnace tube to preheat air, and a flue gas analyzer is placed at the upper part of the furnace tube to record flue gas data in real time.

7. The method for evaluating the combustion performance of a fuel based on sintered quasi-particles according to claim 1, characterized by: The combustion experiment in S4 is that different quasi-particle samples are placed in a tube furnace through a tray respectively, 5 L / min flow of N2 is introduced to protect the fuel from combustion reaction, the tube furnace is heated to 1273 K, and after constant temperature for 30 minutes, the experiment starts, 5 L / min flow of N2 is converted to 5 L / min flow of compressed air to make the fuel start to burn and heat up, and the flue gas temperature change, fuel combustion time, gas composition change and quasi-particle weight loss rate are recorded during the experiment.

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