A method for evaluating the gas emission effect of mixed combustion of coal-based carbon-containing solid waste and biomass carbon

Abstract

The application discloses a method for evaluating gas emission effects of mixed combustion of coal-based carbon-containing solid waste and biomass carbon, and the method comprises the following steps: obtaining industrial analysis and element analysis data of mixed fuels of the coal-based carbon-containing solid waste and the biomass carbon with different mixing ratios; performing combustion experiments under standard conditions, measuring emission intensities of NH3, SO2, NO X and CO2, and performing normalization processing to convert the emission intensities into normalized values; based on emission standard limits of atmospheric pollutants in a target country or region, determining a judgment matrix scale of an analytic hierarchy process (AHP) objectively through a limit value ratio relationship, and calculating weight coefficients of NH3, SO2, NO X and CO2; and calculating a gas emission comprehensive index through the industrial analysis and element analysis data, the normalized values and the weight coefficients, wherein a lower value indicates that the mixed fuel has better comprehensive emission performance. The method can quantize a multi-index complex evaluation system into a single comprehensive index, and provides a scientific, objective and authoritative decision basis for optimizing a mixed fuel mixing ratio and a combustion condition.

Description

Technical Field

[0001] This invention relates to the field of industrial solid waste resource utilization and combustion pollution control technology, specifically to an evaluation method for the emission effect of gas mixed combustion of coal-based carbonaceous solid waste and biochar. Background Technology

[0002] Coal-based carbonaceous solid waste and biochar are carbon-rich solid wastes generated during industrial production. Co-combustion of the two is an effective way to achieve their synergistic resource recovery and harmless disposal, which can not only recover energy but also reduce the land occupation and environmental pollution caused by solid waste storage.

[0003] However, the co-combustion of coal-based carbonaceous solid waste and biochar is a complex physicochemical process, and its gas emission performance is influenced by a combination of factors, including the mixing ratio and combustion conditions. Currently, evaluations of the combustion performance of such blended fuels often focus on a single indicator, such as comparing only calorific value or the emission concentration of a single pollutant (e.g., SO2). This one-sided evaluation method fails to reflect the multiple pollutants (e.g., NH3, SO2, NO) generated during the combustion process. X The combined environmental effects of pollutants (including greenhouse gas CO2) make it difficult for researchers and engineers to make scientific and optimal choices among various mixed scenarios and operating conditions, thus failing to maximize environmental and economic benefits. Furthermore, existing comprehensive evaluation methods rely heavily on subjective expert scoring when determining the weights of different pollutants, resulting in strong subjectivity and poor reproducibility.

[0004] Therefore, there is an urgent need in this field for a method that can comprehensively, objectively, and quantitatively evaluate the gas emission effects of co-combustion of coal-based carbonaceous solid waste and biochar, so as to guide the optimization of blended fuel formulations and the parameter control of the combustion process. Summary of the Invention

[0005] To address the problems existing in the prior art, this invention provides an evaluation method for the emission effect of gas from the mixed combustion of coal-based carbonaceous solid waste and biochar. This method integrates multiple pollutant emission indicators into a single, quantitative comprehensive index and objectively determines the weight of each indicator based on national emission standards, thereby scientifically, intuitively, and authoritatively evaluating the comprehensive environmental performance of different mixing schemes and combustion conditions.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A method for evaluating the emission effect of co-combustion of coal-based carbonaceous solid waste and biochar, specifically including the following steps: Step 1: Prepare mixed fuel samples of coal-based carbonaceous solid waste and biochar with different mass mixing ratios, and obtain industrial analysis and elemental analysis data for each sample. Step 2: Under standard combustion conditions, conduct combustion experiments on each mixed fuel sample, and measure and record NH3, SO2, and NO. X The emission intensity of CO2 was calculated and normalized to convert it into a dimensionally uniform normalized value under standard conditions. , , , ; Step 3: Based on the current air pollutant emission standards and limits of the target country or region, obtain the emission limits for NH3, SO2, and NO. X and CO2 emission concentration standard limits , , , And ensure that all emission concentration standard limits are dimensionlessly consistent; Step 4: Based on the emission concentration standard limits after unification of dimensions described in Step 3, calculate the limit ratio between each pair of pollutants. or ,in and The first species and The emission concentration standard limits for various pollutants; the judgment matrix scale of the analytic hierarchy process (AHP) is objectively determined according to the preset 1-9 scale mapping rules. And construct a judgment matrix; Step 5: Calculate and normalize the eigenvectors of the judgment matrix described in Step 4 to obtain NH3, SO2, and NO. X and the objective weighting coefficient of CO2 , , , ; Step 6: Calculate the comprehensive gas emission index , The lower the value, the better the overall emission performance of the blended fuel. The specific calculation formula is as follows: In the formula: This is the correction factor.

[0007] Furthermore, the preset 1-9 scale mapping rules described in Step 4 are as follows: when hour, A value of 1 indicates that pollutant i is equally important as pollutant j. when hour, A value of 3 indicates that pollutant i is slightly more important than pollutant j. when hour, A value of 5 indicates that pollutant i is significantly more important than pollutant j. when hour, A value of 7 indicates that pollutant i is significantly more important than pollutant j. when hour, A value of 9 indicates that pollutant i is extremely important relative to pollutant j. when When, calculate its reciprocal. ,at this time , The method for obtaining the value is as follows: when hour, A value of 1 indicates that pollutant j is equally important as pollutant i. when hour, A value of 3 indicates that pollutant j is slightly more important than pollutant i. when hour, A value of 5 indicates that pollutant j is significantly more important than pollutant i. when hour, A value of 7 indicates that pollutant j is significantly more important than pollutant i. when hour, A value of 9 indicates that pollutant j is extremely important relative to pollutant i.

[0008] Furthermore, the correction factor in Step 6 The calculation formula is as follows: Where: N daf The dry ash-free nitrogen content of the blended fuel, expressed in %; S t，daf The dry ash-free total sulfur content of the blended fuel is expressed in %; FC d The dry-basis fixed carbon content of the blended fuel, in %; V ad The volatile matter content of the blended fuel is expressed as air-dried basis, in percentages of %; β is a constant of 0.01 used to adjust the magnitude of the correction factor.

[0009] Furthermore, the emission concentration standard limit for CO2 mentioned in Step 3 The carbon emission concentration limits stipulated by the state for similar combustion equipment are adopted and uniformly converted into dimensions comparable to those of other pollutants.

[0010] Furthermore, the emission concentration standard limit for NH3 mentioned in Step 3... Air pollutant emission limits for boilers using biomass briquettes.

[0011] Furthermore, the standard combustion conditions mentioned in Step 2 refer to a fixed combustion temperature range, excess air coefficient, and combustion residence time.

[0012] Furthermore, in Step 5, the root method is used to calculate the eigenvectors of the judgment matrix.

[0013] Furthermore, by calculating the fuel samples with different mixing ratios... Values, compare and select The sample with the lowest value represents the optimal mixing ratio of coal-based carbonaceous solid waste and biochar.

[0014] Furthermore, coal-based carbonaceous solid waste is prepared from coal gasification fine slag.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention uses national mandatory emission standards as the scaling source for the AHP judgment matrix, completely eliminating the subjectivity and arbitrariness in the weight determination process, making the evaluation results objective, transparent, authoritative, and highly reproducible.

[0016] 2. This invention addresses common pollutants such as NH3, SO2, and NO. X Integrating it into the evaluation system in tandem with the greenhouse gas CO2 has established a comprehensive evaluation system, which aligns with the national environmental protection strategy of "synergistically increasing efficiency through pollution reduction and carbon reduction".

[0017] 3. This invention retains the AHP method's ability to systematically analyze complex decision-making problems, while also quantifying the evaluation results into intuitive forms. The index greatly facilitates engineering decision-making and can be directly used to guide the optimization of fuel ratios and operating parameters.

[0018] 4. This invention provides key technical support for the high-value-added resource utilization of industrial solid waste, which helps to promote the development of a circular economy and achieve a balance between environmental and economic benefits. Attached Figure Description

[0019] Figure 1 This is a flowchart of the present invention; Figure 2 The samples 1 to 6 of the embodiments of the present invention are NH3, SO2, NO under standard operating conditions. X Comparison chart of CO2 emissions; Figure 3 This is a bar chart of the objective weight coefficients of each pollutant calculated based on standard limits in an embodiment of the present invention; Figure 4 These are samples 1 to 6 of the embodiments of the present invention under standard operating conditions. Value comparison chart. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings, using coal-based carbonaceous solid waste prepared from coal gasification slag and biochar prepared from corn cobs as raw materials.

[0021] like Figure 1 As shown, the evaluation method for the gas emission effect of co-combustion of coal-based carbonaceous solid waste and biochar first prepares mixed fuels of coal-based carbonaceous solid waste and biochar with different mass mixing ratios and analyzes their basic characteristics; then, combustion experiments are conducted under standard operating conditions to collect emission data; next, based on the current air pollutant emission standard limits of the target country or region, an objective AHP judgment matrix is ​​constructed and the weights are calculated; finally, the emissions are calculated... The indexes are compared and analyzed to evaluate the overall emission performance of the blended fuels. Specifically: Step 1: Prepare mixed fuel samples of coal-based carbonaceous solid waste and biochar with different mass mixing ratios, and obtain industrial analysis (moisture, ash, volatile matter, fixed carbon) and elemental analysis (C, H, O, N, S) data for each sample.

[0022] The preparation of mixed fuel samples requires crushing coal-based carbonaceous solid waste and biochar to a particle size of <200 mesh, and then mixing them in a ball mill at a speed of 350 r / min for 1.5 h according to various mass mixing ratios to ensure uniform mixing of the samples.

[0023] Industrial analysis and elemental analysis tests were conducted in accordance with national standards GB / T 212-2008 and GB / T 476-2008.

[0024] Step 2: Under standard combustion conditions, combustion experiments were conducted on each mixed fuel sample. NH3, SO2, and NO were measured and recorded using a flue gas analyzer. X The emission intensity of CO2 was calculated and normalized to convert it into a dimensionally uniform normalized value under standard conditions. , , , Standard combustion conditions refer to a fixed range of combustion temperatures, excess air coefficient, and combustion residence time.

[0025] Step 3: Based on the current air pollutant emission standards and limits of the target country or region, obtain the emission limits for NH3, SO2, and NO. X and CO2 emission concentration standard limits , , , And ensure that all emission concentration standard limits are dimensionlessly consistent.

[0026] The emission concentration standard limit for CO2 The emission concentration limits for NH3 are adopted from the national standards for similar combustion equipment and uniformly converted to dimensions comparable to those for other pollutants; Air pollutant emission limits for boilers using biomass briquettes.

[0027] Step 4: Based on the emission standard limits after unification of dimensions described in Step 3, calculate the limit ratio between each pair of pollutants. or ,in and The first species and Emission standard limits for various pollutants; objectively determine the judgment matrix scale of the Analytic Hierarchy Process (AHP) based on the preset 1-9 scale mapping rules. And construct a judgment matrix.

[0028] The preset 1-9 scale mapping rules are as follows: when hour, A value of 1 indicates that pollutant i is equally important as pollutant j. when hour, A value of 3 indicates that pollutant i is slightly more important than pollutant j. when hour, A value of 5 indicates that pollutant i is significantly more important than pollutant j. when hour, A value of 7 indicates that pollutant i is significantly more important than pollutant j. when hour, A value of 9 indicates that pollutant i is extremely important relative to pollutant j. when When, calculate its reciprocal. ,at this time , The method for obtaining the value is as follows: when hour, A value of 1 indicates that pollutant j is equally important as pollutant i. when hour, A value of 3 indicates that pollutant j is slightly more important than pollutant i. when hour, A value of 5 indicates that pollutant j is significantly more important than pollutant i. when hour, A value of 7 indicates that pollutant j is significantly more important than pollutant i. when hour, A value of 9 indicates that pollutant j is extremely important relative to pollutant i.

[0029] Step 5: Calculate and normalize the eigenvectors of the judgment matrix described in Step 4 to obtain NH3, SO2, and NO. X and the objective weighting coefficient of CO2 , , , When calculating the weight coefficients, the root method is used to calculate the eigenvectors of the judgment matrix, and then normalization is performed.

[0030] Step 6: Calculate the comprehensive gas emission index , The lower the value, the better the overall emission performance of the blended fuel. The specific calculation formula is as follows: In the formula: This is the correction factor.

[0031] Among the correction factors The calculation formula is as follows: Where: N daf The dry ash-free nitrogen content of the blended fuel, expressed in %; S t，daf The dry ash-free total sulfur content of the blended fuel is expressed in %; FC d The dry basis fixed carbon content of the blended fuel is expressed as %; β is a constant used to adjust the magnitude of the correction factor, with a default value of 0.01 (0.01 in this invention).

[0032] The coal-based carbonaceous solid waste used in the examples, prepared from coal gasification slag, is a finished product of a specific process. The following statistical results of seven groups of mixed fuel samples of coal-based carbonaceous solid waste and biochar with different mass mixing ratios further illustrate the present invention. Pretreatment process: The coal-based carbonaceous solid waste and biochar used in the following samples were all ground, dried, and sieved to a particle size of less than 200 mesh for later use.

[0033] Sample 1: Pretreated coal-based carbonaceous solid waste and biochar were mixed evenly at a weight ratio of 9:1 to obtain Sample 1. Industrial analysis and elemental analysis were performed according to national standards GB / T 212-2008 and GB / T 476-2008 to obtain the corresponding moisture content M of Sample 1. ad Ash content A d volatile matter V ad Fixed carbon FC d Carbon content C daf Hydrogen content H daf Nitrogen content N daf Sulfur content S t,daf and oxygen content O daf Gas emission analysis was performed using thermogravimetric-mass spectrometry (TGA). The temperature was increased to 800°C at a rate of 10°C / min in air atmosphere, and NH3, SO2, and NO were detected. X Release curves of NH3, SO2, and NO were measured and recorded. X and CO2 emission intensity.

[0034] Sample 2: Pretreated coal-based carbonaceous solid waste and biochar were mixed evenly at a weight ratio of 8:2 to obtain Sample 2. The same industrial analysis, elemental analysis, and gas emission analysis process as Sample 1 was used to obtain the corresponding moisture content M of Sample 2. ad Ash content A d volatile matter V ad Fixed carbon FC d Carbon content C daf Hydrogen content H daf Nitrogen content N daf Sulfur content S t,daf and oxygen content O daf Gas emission analysis was performed using thermogravimetric-mass spectrometry (TGA). The temperature was increased to 800°C at a rate of 10°C / min in air atmosphere, and NH3, SO2, and NO were detected. X Release curves of NH3, SO2, and NO were measured and recorded. X and CO2 emission intensity.

[0035] Sample 3: Pretreated coal-based carbonaceous solid waste and biochar were mixed evenly at a weight ratio of 6:4 to obtain Sample 3. Following the same industrial analysis, elemental analysis, and gas emission analysis process as Sample 1, the corresponding moisture content M of Sample 3 was obtained. ad Ash content A d volatile matter V ad Fixed carbon FC d Carbon content C daf Hydrogen content H daf Nitrogen content N daf Sulfur content S t,dafand oxygen content O daf And emission intensity.

[0036] Sample 4: Pretreated coal-based carbonaceous solid waste and biochar were mixed evenly at a weight ratio of 5:5 to obtain Sample 4. Following the same industrial analysis, elemental analysis, and gas emission analysis process as Sample 1, the corresponding moisture content M of Sample 4 was obtained. ad Ash content A d volatile matter V ad Fixed carbon FC d Carbon content C daf Hydrogen content H daf Nitrogen content N daf Sulfur content S t,daf and oxygen content O daf And emission intensity.

[0037] Sample 5: Pretreated coal-based carbonaceous solid waste and biochar were mixed evenly at a weight ratio of 4:6 to obtain Sample 5. Following the same industrial analysis, elemental analysis, and gas emission analysis process as Sample 1, the corresponding moisture content M of Sample 5 was obtained. ad Ash content A d volatile matter V ad Fixed carbon FC d Carbon content C daf Hydrogen content H daf Nitrogen content N daf Sulfur content S t,daf and oxygen content O daf And emission intensity.

[0038] Sample 6: Pretreated coal-based carbonaceous solid waste and biochar were mixed evenly at a weight ratio of 2:8 to obtain Sample 6. Following the same industrial analysis, elemental analysis, and gas emission analysis process as Sample 1, the corresponding moisture content M of Sample 6 was obtained. ad Ash content A d volatile matter V ad Fixed carbon FC d Carbon content C daf Hydrogen content H daf Nitrogen content N daf Sulfur content S t,daf and oxygen content O daf And emission intensity.

[0039] Sample 7: Pretreated coal-based carbonaceous solid waste and biochar were mixed evenly at a weight ratio of 1:9 to obtain Sample 7. Following the same industrial analysis, elemental analysis, and gas emission analysis process as Sample 1, the corresponding moisture content M of Sample 7 was obtained. ad Ash content A d volatile matter V ad Fixed carbon FCd Carbon content C daf Hydrogen content H daf Nitrogen content N daf Sulfur content S t,daf and oxygen content O daf And emission intensity.

[0040] The industrial analysis and elemental analysis data of samples 1 to 7 are summarized in Table 1 below.

[0041] Table 1. Industrial and elemental analysis data (%) for samples 1 to 7 The NH3, SO2, and NO of samples 1 to 7 above were tested. X The data on CO2 emission intensity are summarized in Table 2 below. Figure 2 As shown.

[0042] Table 2. NH3, SO2, NO content in samples 1 to 7 X and CO2 emission intensity data (10 -18 (g gas / kg sample) The NH3, SO2, and NO of samples 1 to 7 above were tested. X The emission intensity of CO2 is normalized to a normalized value with uniform dimensions under standard conditions. , , , The results are summarized in Table 3 below.

[0043] Taking NH3 as an example, the normalization process is as follows: The total NH3 emission intensity of the seven samples = 19.15 + 16.13 + 20.61 + 21.07 + 21.50 + 22.01 + 23.38 = 146.85; the total SO2 and NO emission intensity of the seven samples X The CO2 emission intensities were 12.26, 689.63, and 2162.22, respectively.

[0044] Sample 1 , , , .

[0045] Table 3 Normalized values ​​of samples 1 to 7 , , , Based on the Hebei Province Boiler Air Pollutant Emission Standard (DB13 / 5161-2020) and the "Benchmark and Baseline Levels for Key Areas of Clean and Efficient Coal Utilization (2022 Edition)", the following standards apply: , , Direct reading; for This invention incorporates carbon emissions into a comprehensive evaluation system. It uses the benchmark value (300 g standard coal / kWh) for coal-fired power generation in the "Benchmark Levels and Baseline Levels for Key Areas of Clean and Efficient Coal Utilization (2022 Edition)" as the calculation basis. Considering the policy guidance nature of this evaluation method, a value with advanced features and distinctiveness is set: 4.0 × 10⁻⁶. 5 mg / m 3 This value represents a low carbon emission level that needs to be achieved, giving CO2 a reasonable weight in the evaluation and reflecting the country's carbon reduction orientation in the field of energy use.

[0046] Obtain NH3, SO2, NO X and CO2 emission concentration standard limits , , , And ensure that all emission concentration standard limits are dimensionlessly consistent, as shown in Table 4 below.

[0047] Table 4 NH3, SO2, NO X and CO2 emission concentration standard limits , , , Based on the emission concentration standard limits with unified dimensions in Table 4 above, calculate the limit ratio between each pair of pollutants. or As shown in Table 5 below.

[0048] Table 5. Ratios of Pairwise Pollutant Limits or Based on the ratio of the limits for each pair of pollutants in Table 5 above. or The scale of the judgment matrix of the analytic hierarchy process is objectively determined according to the preset 1-9 scale mapping rules. The results are shown in Table 6 below.

[0049] Table 6. Determine the elements in the matrix scale Based on Table 6 above, construct the judgment matrix A as shown in Table 7 below.

[0050] Table 7 Judgment Matrix A The weights of each pollutant in matrix A are calculated using the square root method. The calculation process is as follows: ; ; ; Next, the weights of each pollutant are normalized. The normalization method is as follows: Similarly, we can obtain =0.226; =0.120; =0.028 After normalization, the objective weight coefficients of each pollutant were obtained and summarized in Table 8 below. A bar chart of the objective weight coefficients of each pollutant is shown below. Figure 3 As shown.

[0051] Table 8 Objective weighting coefficients for each pollutant The comprehensive gas emission index of samples 1 to 7 was calculated using the industrial and elemental analysis data in Table 1, the normalized values ​​in Table 3, and the weighting coefficients in Table 8. The comprehensive evaluation indexes for samples 1 to 7 are summarized in Table 9 below. The comparison chart is as follows Figure 4 As shown.

[0052] Table 9. Comprehensive gas emission index of samples 1 to 7 Taking sample 1 as an example, the comprehensive gas emission index The calculation process is as follows: Therefore =0.1461 + 0.0348 = 0.1809 From Table 9 and Figure 3 It can be seen that the comprehensive gas emission index of sample 2 under standard combustion conditions is... The lower the ratio, the better the overall emission performance. In other words, when using coal-based carbonaceous solid waste prepared from coal gasification slag and biochar prepared from corn cobs as raw materials to prepare blended fuels in different proportions, the blended fuel prepared in the proportions shown in Sample 2 exhibits the best gas emission performance under standard combustion conditions.

[0053] The evaluation method for the gas emission performance of the co-combustion of coal-based carbonaceous solid waste and biochar can comprehensively and effectively evaluate the gas emission performance when the co-combustion of coal-based carbonaceous solid waste and biochar is carried out. At the same time, this method is an objective and fair evaluation benchmark that resonates with policies, and provides key technical support for the clean and efficient utilization of industrial solid waste.

Claims

1. A method for evaluating the emission effect of co-combustion of coal-based carbonaceous solid waste and biochar, characterized in that, Specifically, the following steps are included: Step 1: Prepare mixed fuel samples of coal-based carbonaceous solid waste and biochar with different mass mixing ratios, and obtain industrial analysis and elemental analysis data for each sample. Step 2: Under standard combustion conditions, conduct combustion experiments on each mixed fuel sample, and measure and record NH3, SO2, and NO. X The emission intensity of CO2 was calculated and normalized to convert it into a dimensionally uniform normalized value under standard conditions. , , , ; Step 3: Based on the current air pollutant emission standards and limits of the target country or region, obtain the emission limits for NH3, SO2, and NO. X and CO2 emission concentration standard limits , , , And ensure that all emission concentration standard limits are dimensionlessly consistent; Step 4: Based on the emission concentration standard limits after unification of dimensions described in Step 3, calculate the limit ratio between each pair of pollutants. or ,in and The first species and Emission concentration standard limits for various pollutants; objectively determine the judgment matrix scale of the analytic hierarchy process based on the preset 1-9 scale mapping rules. And construct a judgment matrix; Step 5: Calculate and normalize the eigenvectors of the judgment matrix described in Step 4 to obtain NH3, SO2, and NO. X and the objective weighting coefficient of CO2 , , , ; Step 6: Calculate the comprehensive gas emission index , The lower the value, the better the overall emission performance of the blended fuel. The specific calculation formula is as follows: In the formula: This is the correction factor.

2. The method for evaluating the emission effect of coal-based carbonaceous solid waste mixed with biochar as described in claim 1, characterized in that, The preset 1-9 scale mapping rules mentioned in Step 4 are as follows: when hour, A value of 1 indicates that pollutant i is equally important as pollutant j. when hour, A value of 3 indicates that pollutant i is slightly more important than pollutant j. when hour, A value of 5 indicates that pollutant i is significantly more important than pollutant j. when hour, A value of 7 indicates that pollutant i is significantly more important than pollutant j. when hour, A value of 9 indicates that pollutant i is extremely important relative to pollutant j. when When, calculate its reciprocal. ,at this time , The method for obtaining the value is as follows: when hour, A value of 1 indicates that pollutant j is equally important as pollutant i. when hour, A value of 3 indicates that pollutant j is slightly more important than pollutant i. when hour, A value of 5 indicates that pollutant j is significantly more important than pollutant i. when hour, A value of 7 indicates that pollutant j is significantly more important than pollutant i. when hour, A value of 9 indicates that pollutant j is extremely important relative to pollutant i.

3. The method for evaluating the emission effect of coal-based carbonaceous solid waste mixed with biochar during combustion according to claim 1, characterized in that, Correction factor in Step 6 The calculation formula is as follows: Where: N daf The dry ash-free nitrogen content of the blended fuel, expressed in %; S t，daf The dry ash-free total sulfur content of the blended fuel is expressed in %; FC d The dry-basis fixed carbon content of the blended fuel, in %; V ad The volatile matter content of the blended fuel is expressed as air-dried basis, in percentages of %; β is a constant of 0.01 used to adjust the magnitude of the correction factor.

4. The method for evaluating the emission effect of coal-based carbonaceous solid waste and biochar co-combustion according to claim 1, characterized in that, The emission concentration standard limit for CO2 mentioned in Step 3 The carbon emission concentration limits stipulated by the state for similar combustion equipment are adopted and uniformly converted into dimensions comparable to those of other pollutants.

5. The method for evaluating the emission effect of coal-based carbonaceous solid waste mixed with biochar during combustion according to claim 1, characterized in that, The emission concentration standard limit for NH3 mentioned in Step 3 Air pollutant emission limits for boilers using biomass briquettes.

6. The method for evaluating the emission effect of coal-based carbonaceous solid waste and biochar co-combustion according to claim 1, characterized in that, The standard combustion conditions mentioned in Step 2 refer to a fixed combustion temperature range, excess air coefficient, and combustion residence time.

7. The method for evaluating the emission effect of coal-based carbonaceous solid waste mixed with biochar during combustion according to claim 1, characterized in that, In Step 5, the root method is used to calculate the eigenvectors of the judgment matrix.

8. The method for evaluating the emission effect of coal-based carbonaceous solid waste mixed with biochar as described in claim 1, characterized in that, By calculating fuel samples with different mixing ratios Values, compare and select The sample with the lowest value represents the optimal mixing ratio of coal-based carbonaceous solid waste and biochar.

9. The method for evaluating the emission effect of coal-based carbonaceous solid waste mixed with biochar as described in claim 1, characterized in that, Coal-based carbonaceous solid waste is prepared from coal gasification fine slag.

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