Charcoal green contribution degree evaluation method based on energy value, carbon footprint and economy

Abstract

The invention discloses a charcoal green contribution degree evaluation method based on energy values, carbon footprints and economy. The method specifically comprises the following steps: acquiring theoretical calorific value information; according to the theoretical heat value information, the product output rate of energy conversion and utilization information is calculated, and the energy conversion and utilization information comprises biomass, biochar and biogas; evaluating the energy conversion and utilization information through the product output rate by using an energy value evaluation analysis method, a carbon footprint evaluation analysis method and an economic evaluation method to obtain an energy value evaluation result, a carbon footprint evaluation result and an economic evaluation result; and obtaining a green contribution degree based on the energy value evaluation result, the carbon footprint evaluation result and the economic evaluation result.

Description

Technical Field

[0001] The present invention belongs to the technical field of carbon resource assessment, and in particular relates to a method for assessing the green contribution of biochar based on energy value, carbon footprint and economy. Background Art

[0002] With the increasing awareness of environmental protection and sustainable development, the resource utilization of agricultural waste has become an important approach. Rice straw, as a common agricultural waste, has great potential for energy conversion.

[0003] The existing patent document's method for calculating the soil-biochar carbon sequestration and emission reduction potential includes selecting biochar, test soil, and a static box. It is a method for calculating the biochar carbon sequestration and emission reduction potential, but its defect is that it does not reflect the calculation of green contribution. The existing patent document's method for calculating the carbon footprint of wolfberry branch carbonization and field return based on life cycle assessment is insufficient in that it only focuses on the carbon footprint calculation method and does not continue to consider other influencing factors. The existing patent document's method and device for calculating carbon emissions of a polymer material and its products has the defect that the technical problems they solve are different, not biochar, and the ideas and specific methods are not for calculating green contribution.

[0004] Therefore, there is an urgent need for a biochar green contribution assessment method based on energy value, carbon footprint and economy to address the shortcomings of existing technologies. Summary of the Invention

[0005] The purpose of this invention is to propose a method for evaluating the green contribution of biochar based on energy value, carbon footprint and economy. It aims to evaluate the green contribution of biochar prepared from rice straw through a comprehensive comparative analysis of indicators such as energy value, carbon footprint and economy, and provide a scientific basis for the comprehensive utilization of agricultural waste.

[0006] To achieve the above objectives, the present invention provides a method for evaluating the green contribution of biochar based on energy value, carbon footprint, and economy, which specifically includes the following steps:

[0007] Collect theoretical calorific value information;

[0008] Calculating the product output rate of straw energy using the theoretical calorific value information, wherein the straw energy includes biomass, biochar, and biogas;

[0009] Using the energy value evaluation analysis method, the carbon footprint evaluation analysis method and the economic evaluation method respectively, the straw energy is evaluated according to the product output rate to obtain the energy value evaluation result, the carbon footprint evaluation result and the economic evaluation result;

[0010] A green contribution is obtained based on the energy value evaluation result, the carbon footprint evaluation result, and the economic evaluation result.

[0011] Optionally, the theoretical calorific value information includes the calorific value of rice straw, biomass, biochar, biogas and methane.

[0012] Optionally, calculating the product output rate of the straw energy using the theoretical calorific value information includes:

[0013] Set target straw weight;

[0014] Obtaining the theoretical yield of the straw energy according to the weight of the target straw and the theoretical calorific value information;

[0015] collecting the moisture content and power consumption of the target straw, and obtaining the actual output of the straw energy based on the weight of the target straw;

[0016] Based on the theoretical output and the actual output, the product output rate of the straw energy information is calculated.

[0017] Optionally, before evaluating the straw energy through the product output rate by using the energy value evaluation and analysis method, the carbon footprint evaluation and analysis method, and the economic evaluation method respectively, the method includes: collecting straw and obtaining the actual weight of the straw.

[0018] Optionally, the energy value evaluation analysis method is used to evaluate the straw energy by the product output rate, and obtaining the energy value evaluation result includes:

[0019] Obtain energy value and calorific value conversion information;

[0020] Obtaining the weight of the straw energy based on the actual weight of the straw and the product output rate;

[0021] Obtaining the energy value evaluation result through the energy value and calorific value conversion information and the weight of the straw energy;

[0022] The energy value assessment results include biomass energy value, biochar energy value and biogas energy value.

[0023] Optionally, using the carbon footprint assessment analysis method to assess the straw energy through the product output rate, obtaining the carbon footprint assessment result includes:

[0024] Obtaining the weight of the straw energy based on the actual weight of the straw and the product output rate;

[0025] collecting the carbon contents of the biomass and the biochar, and calculating the carbon weights of the biomass and the biochar based on the weights of the biomass and the biochar;

[0026] Obtaining the methane content in the biogas, and obtaining the mass of the methane in the biogas by the weight of the biogas;

[0027] Obtain the amount of carbon dioxide released when carbon fuel is completely burned;

[0028] Calculating the theoretical carbon weight of the straw energy by the carbon weight of the biomass and the biochar, the mass of methane in the biogas, and the carbon dioxide release;

[0029] Obtaining the correction coefficients of the biomass and the biochar, the GWP values ​​of carbon dioxide and methane, and using the theoretical carbon weight of the straw energy to obtain the carbon footprint of the straw energy;

[0030] The carbon footprint assessment results include biomass carbon footprint, biochar carbon footprint and biogas carbon footprint.

[0031] Optionally, the economic evaluation method is used to evaluate the straw energy by the product output rate, and obtaining the economic evaluation result includes:

[0032] The economic evaluation results include biomass economic evaluation results, biochar economic evaluation results and biogas economic evaluation results;

[0033] Obtaining the weight of the straw energy based on the actual weight of the straw and the product output rate;

[0034] Calculating the cost of the straw;

[0035] Collect diesel prices, storage fees, and labor costs, obtain fuel consumption of a vehicle loaded with the straw for a target distance, calculate freight, and then calculate the cost of the straw;

[0036] Collecting the unit price of biomass fuel and the selling price of biomass fuel, and obtaining the biomass economic evaluation result based on the cost of the straw and the weight of the biomass;

[0037] Collect equipment cost and years of use, residential electricity prices, and labor costs, calculate straw crushing fees and carbonization furnace fees, and obtain the biochar cost based on the straw cost and labor costs;

[0038] Collecting the selling price of biochar, and obtaining the economic evaluation result of the biochar according to the cost of the biochar and the selling price of the biochar;

[0039] Collect the pond construction fee, management fee, maintenance fee, crushing fee and electricity fee to calculate the total cost of biogas production;

[0040] Collecting residential gas prices and calculating the market gas selling price based on the weight of the biogas;

[0041] The biogas economic evaluation result is obtained through the total cost of biogas preparation and the market gas price.

[0042] Optionally, obtaining the green contribution based on the energy value assessment result, the carbon footprint assessment result, and the economic assessment result includes:

[0043] Determining the weight ratio of the emergy assessment result, the carbon footprint assessment result, and the economic assessment result;

[0044] According to the weight ratio, the energy value assessment result, the carbon footprint assessment result and the economic assessment result are weighted and calculated to obtain the green contribution.

[0045] The present invention has the following beneficial effects:

[0046] Based on the energy value-carbon footprint-economy evaluation method, the present invention conducts a comprehensive analysis of the green contribution of biochar prepared from rice straw. The results show that biochar prepared from rice straw shows good performance in energy value, carbon footprint and economy, and has a high green contribution to the environment, which provides a feasible way for the comprehensive utilization of agricultural waste. Through quantitative conversion and qualitative analysis, the three indicators of energy value, carbon footprint and economy are evaluated and different weights are assigned to calculate the green contribution value, so as to accurately study the production performance of biochar prepared from rice straw and provide theoretical research and practical application guidance for the treatment of agricultural waste straw.

[0047] According to the three evaluation methods of energy value, carbon footprint and economy, the three main energy conversion and resource utilization forms of straw, namely, straw as biomass fuel, straw for biochar and straw for biogas, were converted and calculated. The green contribution was reconstructed with different weights and evaluated. Finally, the method and tool were promoted and applied so that it can be used in research, production and management related to rural agricultural waste treatment, providing scientific basis and decision-making support for rural energy resource utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of this application. The exemplary embodiments and descriptions of this application are intended to explain this application and do not constitute an improper limitation on this application. In the accompanying drawings:

[0049] Figure 1 Schematic diagram of the overall framework of the biochar green contribution evaluation method based on energy value, carbon footprint and economy according to an embodiment of the present invention;

[0050] Figure 2 A schematic diagram of the process flow for calculating the finished product output rate of the three energy conversion and utilization forms proposed in an embodiment of the present invention;

[0051] Figure 3 A logic diagram for writing Java program code for calculating the theoretical yield of biochar, biomass, and biogas from rice straw, as proposed in an embodiment of the present invention;

[0052] Figure 4 A schematic diagram of coding logic for the conversion calculation between energy value and calorific value proposed in an embodiment of the present invention;

[0053] Figure 5 Write a logic diagram for the Java program code for calculating the carbon footprint of different energy sources proposed in an embodiment of the present invention;

[0054] Figure 6 Write a code logic diagram for the economic evaluation method proposed in the embodiment of the present invention;

[0055] Figure 7 This is a schematic diagram of a new reconstructed green contribution framework proposed in an embodiment of the present invention;

[0056] Figure 8 This is a schematic diagram of an implementation plan for the green contribution evaluation steps proposed in an embodiment of the present invention;

[0057] Figure 9 A logic diagram for writing codes for calculating the green contribution of the three energy sources proposed in an embodiment of the present invention. DETAILED DESCRIPTION

[0058] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0059] It should be noted that the steps shown in the flowcharts of the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and that, although a logical order is shown in the flowcharts, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0060] This method, based on emergy, carbon footprint, and economics, assesses the green contribution of biochar. It primarily involves collecting and calculating data on the finished product output rates of three different energy conversion and utilization methods. It then sequentially converts and calculates these three different energy conversion and utilization methods using emergy, carbon footprint, and economic evaluation methods. Finally, the green contribution is reconstructed using different weights based on the emergy analysis, carbon footprint assessment, and economic evaluation data. This method can be used in research, production, and management related to rural agricultural waste treatment, providing a scientific basis and decision-making support for rural energy resource utilization.

[0061] like Figure 1As shown, this embodiment provides a method for evaluating the green contribution of biochar based on energy value, carbon footprint, and economy. It adopts a comprehensive comparative analysis method based on energy value, carbon footprint, and economy, including energy value calculation, carbon footprint calculation, and economic evaluation. By writing Java program code, the theoretical output, energy value, carbon footprint, and economy of biochar, biomass, and biogas prepared from rice straw are calculated and evaluated. The green contribution value is calculated based on weight reconstruction to describe the green contribution of different energy conversion forms to the environment. Specifically, the following steps are included:

[0062] S1. Collect data and calculate the product output rates of biomass, biochar and biogas;

[0063] When rural agricultural waste straw is used as energy resource, there are three main forms of energy conversion resource utilization: straw as biomass fuel, straw to prepare biochar, and straw to prepare biogas. Data collection and calculation of the finished product output rate of the above three different forms of energy conversion and utilization are carried out, such as Figure 2 As shown, specifically including the following:

[0064] S11. Collect the calorific value of rice straw, biomass, biochar, biogas and methane;

[0065] As shown in Table 1, the calorific values ​​of rice straw, biochar prepared from rice straw, biomass prepared from rice straw, and biogas prepared from rice straw are as follows:

[0066] Table 1

[0067] energy Calorific value rice straw 14-18MJ / kg biochar 25-30MJ / kg Rice straw biomass 14-18MJ / kg biogas <![CDATA[20-26MJ / m 3 ]]> methane 55-56MJ / kg

[0068] A. The calorific value of rice straw is affected by many factors, including the type of straw, moisture content, density, etc. Generally speaking, the calorific value of rice straw is between 14-18MJ / kg (megajoules / kilogram).

[0069] B. The calorific value of biochar is typically between 25-30 MJ / kg. This value is a general estimate. The specific calorific value depends on factors such as the biochar raw material, preparation process, and moisture content. Different types of biomass and preparation methods may result in slight differences in calorific value.

[0070] C. The calorific value of rice straw biomass is generally between 14-18 MJ / kg. This value is a general estimate. The specific calorific value depends on the rice straw variety, moisture content, and other factors. Different rice straw varieties and processing methods may result in slight differences in calorific value.

[0071] D. The calorific value of biogas is usually 20-25MJ / m 3(MJ / m³) is a general estimate; the specific calorific value depends on factors such as the composition and content of the biogas, as well as the conditions during its production. Biogas is primarily composed of methane (CH4) and small amounts of other gases. Methane is the main component of biogas and has a high calorific value.

[0072] The calorific value of CH4 is typically between 55 and 56 MJ / kg. This value is a general estimate, and the specific calorific value depends on the purity of the methane and the measurement method. Methane is the main component of natural gas and has a high calorific value, making it important in energy utilization. However, it should be noted that the calorific value of methane may be affected by factors such as gas purity and moisture content.

[0073] S12. Calculate the calorific value of 1000 kg of rice straw, estimate the theoretical yield of biochar, biomass, and biogas prepared from 1000 kg of rice straw based on the calorific value theory, calculate the actual yield based on the moisture content, labor loss, etc., and obtain the actual output rate of biochar, biomass, and biogas. The theoretical output rates of biochar, biomass, and biogas prepared from 1000 kg of rice straw are shown in Table 2.

[0074] Table 2

[0075] energy Calorific value Theoretical output Actual output Actual output rate 1000kg straw 18000MJ biomass 18MJ / kg 1000.00kg 650.00kg 65.00％ biochar 30MJ / kg 600.00kg 390.00kg 39.00％ biogas 55MJ / kg 363.64kg 236.36kg 23.65％

[0076] S121, The actual output rate of biochar prepared theoretically from 1000 kg of rice straw is calculated as follows:

[0077] The calorific value of rice straw is calculated to be 14-18MJ / kg, and the calorific value of 1000kg of rice straw is 18000MJ;

[0078] Output of biochar produced from 1000kg of rice straw: The calorific value of biochar is 25-30MJ / kg. Theoretically, 1000kg of rice straw can produce 600kg of biochar, without considering moisture content, labor loss, etc.

[0079] Considering the moisture content and labor consumption (processing, transportation, storage and loss), assuming a moisture content of 30% and a labor consumption of 5%, 1000 kg of straw can theoretically produce 390 kg of biochar;

[0080] The actual output rate of biochar products prepared from rice straw is 39%.

[0081] S122. The actual biomass yield from theoretical preparation of 1000 kg of rice straw is calculated as follows:

[0082] Output of biomass products prepared from 1000kg of rice straw: 1000kg of rice straw can theoretically produce 1000kg of biomass, without considering moisture content, labor loss, etc.

[0083] Collect the moisture content of straw and labor consumption (processing, transportation, storage and loss). Assuming the moisture content is 30% and the labor consumption is 5%, calculate the output of biomass fuel produced from 1000kg of straw: Biomass yield = straw mass * (1-moisture content-labor consumption). The result is 650kg, that is, 1000kg of straw can theoretically produce 650kg of biomass.

[0084] The actual output rate of biomass fuel products prepared from rice straw is 65%.

[0085] S123. The actual biogas production rate of 1000kg rice straw is calculated as follows:

[0086] The output of biogas produced from 1000kg of rice straw is: biogas = 90% methane + 10% other gases. The calorific value of methane is 55-56MJ / kg. Theoretically, 1000kg of straw can produce 363.63kg of biogas, without considering moisture content, labor consumption, etc.

[0087] Assuming a moisture content of 30% and a labor consumption of 5%, the theoretical output of biogas produced from 1000kg of straw is 236.36kg.

[0088] The actual output rate of biogas products prepared from rice straw is 23.6%.

[0089] Write code to collect and calculate data on the output rates of three different energy conversion and utilization forms: biomass, biochar, and biogas. This code is a code segment that can run on Java and is used to calculate the actual output rates of biochar, biomass, and biogas prepared from rice straw. The details are as follows:

[0090]

[0091]

[0092] The code calculation logic is explained as follows:

[0093] like Figure 3 As shown in the figure, the above code is a Java program used to calculate the actual yield of biochar, biomass, and biogas from rice straw. It contains some variables and formulas for calculating the theoretical and actual yields of different products. It has the following features:

[0094] First, the code defines some variables, including the weight of rice straw (strawWeight), moisture content (moistureContent), and processing loss (processingLoss). These variables are used to calculate the yield of different products.

[0095] Next, the code calculated the theoretical biochar yield using a formula that uses the weight, moisture content, and labor losses of rice straw, as well as the calorific value of rice straw and biochar. The actual biochar yield was then calculated, taking into account the actual yield rate.

[0096] Similarly, the code also calculates the theoretical and actual yields of biomass and biogas. The theoretical yield of biomass directly uses the weight, moisture content, and labor losses of rice straw, while the theoretical yield of biogas also takes into account the methane content and calorific value of the biogas.

[0097] Finally, the code uses the System.out.println() statement to output the calculation results to the console.

[0098] It should be noted that the above code assumes some parameter values. In actual use, they need to be modified and improved according to specific circumstances.

[0099] S2. After collecting and calculating the finished product output rates of three different energy conversion and utilization forms, namely biomass, biochar, and biogas, the three different energy conversion and utilization forms are converted, calculated, and evaluated using the energy value, carbon footprint, and economic evaluation methods. The specific steps include:

[0100] S21. Use the energy value assessment analysis method to evaluate the three different energy conversion and utilization forms of rice straw based on the finished product output rate of biomass, biochar, and biogas. Specifically, the following contents are included:

[0101] S211. Calorific value and energy value are two indicators commonly used to measure the energy content of fuel. They can be converted in the following ways:

[0102] Conversion from calorific value to energy value: Calorific value is usually expressed in MJ / kg (megajoules / kilogram), while energy value is usually expressed in kWh (kilowatt-hours). The following conversion relationship can be used for conversion:

[0103] 1MJ / kg=0.2778kWh / kg

[0104] Energy to calorific value conversion: If you have energy values ​​in kWh, you can convert them to MJ using the following conversion relationship:

[0105] 1kWh = 3.6MJ

[0106] These conversions are approximate and the actual conversions will vary depending on the characteristics and composition of the fuel. Therefore, when performing specific energy and calorific value conversions, refer to the specific technical parameters of the fuel or relevant standards.

[0107] S212. As shown in Table 3, the energy conversion calculation and evaluation table for preparing biomass fuel, biochar, and biogas from 1000 kg of straw, based on the relationship between calorific value and energy value, the energy conversion calculation and evaluation for preparing biomass fuel, biochar, and biogas from 1000 kg of straw is performed as follows:

[0108] Table 3

[0109]

[0110] According to S1, 1000kg of straw can produce 650kg of biomass fuel. According to the conversion relationship between calorific value and energy value in S211, the calculation formula of biomass fuel energy value is: biomass fuel energy value = biomass output * unit energy value, and the calculated result is 3250.26kWh;

[0111] According to S1, 1000kg of straw can produce 390kg of biochar. According to the conversion relationship between calorific value and energy value in S211, the calculation formula of biochar energy value is: biochar energy value = biochar yield * unit energy value, and the calculated result is 3250.26kWh;

[0112] According to S1, 1000kg of straw can produce 327.27m3 of biogas. 3 According to the conversion relationship between S211 calorific value and energy value, the calculation formula of biogas energy value is: 90% of biogas is methane, and the biogas energy value is calculated based on the energy value of methane. The calculation formula is: biogas energy value = biogas production * unit energy value, and the calculation result is 4012.667kWh.

[0113] Write code that uses the energy value assessment analysis method to evaluate the three different forms of energy conversion and utilization of rice straw in S1. This code can be run on Java. The details are as follows:

[0114]

[0115]

[0116] The code calculation logic is explained as follows:

[0117] The energy and calorific value conversion relationship in the above code uses the approximate values ​​given in the example. In actual application, the accurate conversion relationship should be determined based on the technical parameters or relevant standards of the specific fuel.

[0118] like Figure 4 As shown in the figure, the code for evaluating the three different forms of energy conversion and utilization of rice straw in S1 using the energy value evaluation analysis method is a conversion calculator between energy value and calorific value. It contains five parts of calculation and has the following characteristics:

[0119] 1. Conversion of calorific value to energy value

[0120] First, a variable heatValue is defined to represent the calorific value in MJ / kg. Then, the calorific value is converted to energy value in kWh / kg by multiplying it by 0.2778. Finally, System.out.println() is used to print the converted energy value result.

[0121] 2. Conversion of energy value to calorific value

[0122] First, a variable energyValue2 is defined to represent the energy value in kWh. Then, the energy value is converted to calorific value in MJ by multiplying it by 3.6. Finally, System.out.println() is used to print the converted calorific value result.

[0123] 3. Calculation of biomass fuel energy value

[0124] First, a variable biomassWeight is defined to represent the weight of the biomass fuel in kg. Then, the energy value of the biomass fuel is calculated by multiplying the weight of the biomass fuel by the energy value, i.e., energyValue. The unit is kWh. Finally, the energy value result of the biomass fuel is printed using System.out.println().

[0125] 4. Calculation of biochar energy value

[0126] First, a variable biocharWeight is defined to represent the weight of the biochar in kg. Then, the energy value of the biochar is calculated by multiplying the weight of the biochar by the energy value, i.e., energyValue, in kWh. Finally, the energy value of the biochar is printed out using System.out.println().

[0127] 5. Calculation of biogas energy value

[0128] First, a variable called biogasWeight is defined to represent the weight of the biogas in kg. Then, a variable called methanePercentage is defined to represent the percentage of methane in the biogas. Next, the energy value of the biogas in kWh is calculated by multiplying the weight of the biogas by the percentage of methane and the energy value, i.e., energyValue. Finally, the energy value of the biogas is printed out using System.out.println().

[0129] The energy value and calorific value conversion relationship of the code used to evaluate the three different energy conversion and utilization forms of rice straw in S1 using the energy value evaluation analysis method uses the approximate value given in the example. In actual application, the accurate conversion relationship should be determined based on the technical parameters or relevant standards of the specific fuel.

[0130] S22. Use the carbon footprint assessment analysis method to evaluate the three different energy conversion and utilization forms of rice straw through the finished product output rate of the three different energy conversion and utilization forms: biomass, biochar, and biogas;

[0131] A carbon footprint is a measure of greenhouse gas emissions generated by a specific activity or product, typically expressed in tons of carbon dioxide equivalent. A fuel's carbon footprint depends on its carbon content and the amount of carbon dioxide emitted during combustion. Different fuels have different carbon contents and combustion characteristics, so it's not possible to simply deduce a fuel's carbon footprint based on its calorific value. When assessing a fuel's carbon footprint, the following factors are typically considered:

[0132] Carbon content of the fuel: Different fuels have different carbon contents, for example, coal has a higher carbon content and natural gas has a lower carbon content.

[0133] Emissions during combustion: Greenhouse gases such as carbon dioxide are produced when fuel is burned. The amount of emissions depends on the combustion efficiency and the performance of the combustion equipment.

[0134] Therefore, to accurately calculate the carbon footprint of a fuel, a detailed carbon emissions analysis is required, including consideration of the carbon content of the fuel, emissions during combustion, and other factors, which requires reference to relevant carbon emission data, fuel characteristics, and emission calculation methods.

[0135] When carbon fuel is completely burned, each kilogram of carbon will produce about 3.67 kilograms of carbon dioxide (CO2). As shown in Table 4, the carbon footprint conversion table for preparing biomass fuel, biochar, and biogas from 1000 kg of straw, the carbon footprint conversion steps for preparing biomass fuel, biochar, and biogas from 1000 kg of straw are as follows:

[0136] Table 4

[0137]

[0138] Step 1: Calculate the carbon footprint of biomass fuel produced from 1000 kg of straw. According to S1, 1000 kg of straw produces 650 kg of biomass fuel. The carbon content of straw biomass fuel depends on the type of straw and how it was processed. Generally speaking, straw is composed of plant parts such as stems, leaves, and flowers, primarily consisting of organic matter such as cellulose, hemicellulose, and lignin. These organic substances are primarily composed of carbon, hydrogen, and oxygen. Research data suggests that the carbon content of straw is approximately 40% to 50%, though the specific value is affected by factors such as the biomass source, growing environment, and harvesting time. Different types of straw, such as rice straw, corn straw, and wheat straw, may have varying carbon contents. Calculating the carbon footprint of 650 kg of biomass fuel requires considering the amount of carbon dioxide released during combustion. Based on a 50% carbon content in straw, the carbon content of 650 kg of biomass fuel is calculated to be 325 kg. According to chemical equations, each carbon atom releases two oxygen atoms upon complete combustion, producing one carbon dioxide molecule. Therefore, the steps to calculate the carbon footprint of 650kg of biomass fuel are as follows:

[0139] (1) Convert the carbon content of biomass fuel to the mass of carbon dioxide. According to the relationship that each carbon atom generates one carbon dioxide molecule, 325kg of carbon content will generate 325kg*44 / 12≈1191.67kg of carbon dioxide.

[0140] (2) Taking into account the possible emission losses during the combustion process, corrections are made based on actual conditions. Assuming a correction factor of 0.9, meaning 90% of the carbon is completely burned to produce carbon dioxide, the corrected carbon dioxide emissions are 1191.67 kg * 0.9 ≈ 1072.50 kg.

[0141] (3) Considering the Global Warming Potential (GWP) of carbon dioxide, multiply the mass of carbon dioxide by the corresponding GWP value based on the internationally recognized GWP value. Assuming a GWP value of 1, the final carbon footprint is 1072.50kg * 1 = 1072.50kg.

[0142] Based on the above calculation, the carbon footprint of 650kg of biomass fuel is approximately 1072.50kg, which can be used as a reference for assessing the impact of biomass fuel on climate change. However, actual results may vary depending on factors such as combustion equipment, combustion efficiency, and emission control.

[0143] Step 2: Calculate the carbon footprint of biochar produced from 1000 kg of straw. According to S1, calculate the carbon footprint of 390 kg of biochar produced from 1000 kg of straw. The carbon content of biochar is usually high, ranging from 70% to 90%. The specific carbon content depends on factors such as the type of biomass raw material, the preparation process, and the treatment method. Biochar is obtained by pyrolyzing or gasifying biomass at high temperatures. This process removes non-carbon elements in the biomass, such as moisture, ash, and volatile organic compounds, thereby increasing the carbon content of the biochar.

[0144] To calculate the carbon footprint of 390kg of biochar, we need to consider the carbon content of the biochar and the emissions losses during the production process. Based on the carbon content of biochar being 90%, 390kg of biochar contains 351kg of carbon. Therefore, the steps to calculate the carbon footprint of 390kg of biochar are as follows:

[0145] (1) Convert the carbon content of biochar to the mass of carbon dioxide. Based on the relationship that each carbon atom generates one carbon dioxide molecule, 351 kg of carbon content will generate 351 kg * 44 / 12 ≈ 1287.5 kg of carbon dioxide.

[0146] (2) Considering the possible emission losses during the biochar preparation process, corrections are made based on actual conditions. Assuming a correction factor of 0.95, meaning 95% of the carbon is retained, the corrected CO2 emissions are 1287.5 kg * 0.95 ≈ 1223.13 kg.

[0147] (3) Considering the Global Warming Potential (GWP) of carbon dioxide, multiply the mass of carbon dioxide by the corresponding GWP value based on the internationally recognized GWP value. Assuming a GWP value of 1, the final carbon footprint is 1223.13 kg * 1 = 1223.13 kg.

[0148] Based on the above calculations, the carbon footprint of 390 kg of biochar is approximately 1223.13 kg, which can be used as a reference for assessing the impact of biochar on climate change. However, the actual situation may vary depending on different factors in the biochar production process.

[0149] Step 3: Calculate the carbon footprint of biogas produced from 1000kg of straw. According to Step S1, calculate the carbon footprint of 236.36kg of biogas produced from 1000kg of straw. Calculate the carbon footprint of 236.36kg of biogas based on a 90% methane content. The steps are as follows:

[0150] First, determine the mass of methane in the biogas. Assuming the methane content in the biogas is 90%, the mass of methane in 236.36 kg of biogas is 236.36 kg * 0.9 = 212.724 kg.

[0151] Next, convert the mass of methane to carbon dioxide equivalents, taking into account its greenhouse effect. According to the internationally recognized GWP, methane has a GWP of 25, meaning its greenhouse effect is 25 times that of carbon dioxide. Therefore, the carbon dioxide equivalent of 212.724 kg of methane is 212.724 kg * 25 = 5318.1 kg.

[0152] Based on the above calculation, the carbon footprint of 236.36 kg of biogas is approximately 5318.1 kg. This value can be used as a reference for assessing the impact of biogas on climate change. However, the actual carbon footprint varies depending on the composition and production process of the biogas.

[0153] Write code that uses the carbon footprint assessment analysis method to evaluate the three different forms of energy conversion and utilization of rice straw in S1. This code can be run on Java. The details are as follows:

[0154]

[0155]

[0156] The code calculation logic is explained as follows:

[0157] The above code example only demonstrates how to calculate the carbon footprint. The specific values ​​and calculation steps need to be adjusted according to the actual situation.

[0158] like Figure 5 As shown in Figure 1, the code for evaluating the three different forms of energy conversion and utilization of rice straw in S1 using the carbon footprint assessment analysis method is a Java program used to calculate the carbon footprint of different energy sources and has the following characteristics:

[0159] First, in the `main` method, the carbon footprint calculation process of three energy sources is defined.

[0160] 1. Calculation of carbon footprint of biomass fuels:

[0161] `biomassFuelCarbonContent` indicates that the carbon content of biomass fuel is 50%;

[0162] -,biomassFuelWeight` indicates that the weight of biomass fuel is 650kg;

[0163] -Call the `calculateCarbonFootprint` method, pass in the carbon content and weight of the biomass fuel, and calculate the carbon footprint of the biomass fuel;

[0164] - Use `System.out.println` to print the carbon footprint of biomass fuel.

[0165] 2. Calculation of the carbon footprint of biochar:

[0166] - `biocharCarbonContent` indicates that the carbon content of biochar is 90%;

[0167] - `biocharWeight` indicates the weight of the biochar is 390 kg;

[0168] -Call the `calculateCarbonFootprint` method, passing in the carbon content and weight of the biochar to calculate the carbon footprint of the biochar;

[0169] - Use `System.out.println` to print the carbon footprint of the biochar.

[0170] 3. Calculation of biogas carbon footprint:

[0171] - `methaneContent` indicates that the methane content in the biogas is 90%;

[0172] - `biogasWeight` indicates the weight of biogas is 236.36 kg;

[0173] -Call the calculateMethaneCarbonFootprint method, pass in the content and weight of methane in the biogas, and calculate the carbon footprint of the biogas;

[0174] - Use `System.out.println` to print the carbon footprint of the biogas.

[0175] Next, two methods are defined in the code:

[0176] (1) The `calculateCarbonFootprint` method is used to calculate the carbon footprint and accepts two parameters: carbon content and weight.

[0177] First, calculate the mass of carbon from its carbon content and weight;

[0178] Then, convert the mass of carbon to the mass of carbon dioxide using a conversion ratio of 44 / 12;

[0179] Finally, multiply the mass of CO2 by 1 (assuming a GWP of 1) to get the carbon footprint and return that value.

[0180] (2) The `calculateMethaneCarbonFootprint` method is used to calculate the carbon footprint of methane and accepts two parameters: methane content and weight.

[0181] First, the mass of methane is calculated from the methane content and weight;

[0182] Then, convert the mass of methane to the mass of carbon dioxide equivalent using a conversion ratio of 25;

[0183] Finally, the mass of carbon dioxide equivalent is returned as the carbon footprint of methane.

[0184] In summary, the code for evaluating the three different forms of energy conversion and utilization of rice straw in S1 using the carbon footprint assessment analysis method demonstrates how to calculate the carbon footprint of different energy sources, using different conversion ratios to calculate the corresponding carbon footprint based on the carbon content and weight of the energy.

[0185] S23. Use the economic evaluation method to evaluate the three different energy conversion and utilization forms of rice straw, namely biomass, biochar, and biogas, based on their finished product output rates. Specifically, the following are included:

[0186] S231. Estimate the cost of 1000 kg of rice straw. Assume that the cost of rice straw is 0 and the distance from the rice field to the storage room is 50 km, as shown in Table 5, the cost table of 1000 kg of rice straw. The specific process is as follows:

[0187] Table 5

[0188]

[0189] (1) Collect and investigate diesel costs, storage costs, and labor costs: According to the survey results, diesel costs are 7.85 yuan / L (a truck transporting 1000 kg of straw consumes an average of 0.0685 L of fuel per kilometer, and 72 m 2 House rental fee is 500 yuan / month (17 yuan per day), labor cost is 80 yuan / day (including production and transportation);

[0190] (2) Calculate the fuel consumption of a truck carrying 1000 kg of straw for 50 km: Truck fuel consumption = distance * truck fuel consumption per kilometer. Based on the data in (1) in S231, the result is 3.425 L.

[0191] (3) Calculate the 50km transportation fee: Transportation fee = diesel price * truck fuel consumption. Based on the data in (1) and (2) in S231, the result is 26.89 yuan;

[0192] (3) According to the actual production needs of rice straw, 1000 kg of straw requires 4 people, and the labor cost is 320 yuan;

[0193] (4) Calculate the cost of 1000kg of straw (excluding raw material costs): Straw cost = freight + storage fee + labor cost. Based on the data in (1)-(3) in S231, the result is 363.89.

[0194] S232. As shown in Table 6, the economic evaluation table for preparing biomass fuel from 1000kg of rice straw, the unit price of biomass fuel is 2.98 yuan / jin, and the price of 650kg is 3874 yuan, so the profit is 3874-363.89=3510.11 yuan.

[0195] Table 6

[0196]

[0197] S233. As shown in Table 7, Energy and Economic Evaluation Table for Producing Biochar from 1000kg Straw, the specific steps are as follows:

[0198] Table 7

[0199] Crusher cost (yuan / year) 30 Carbonization furnace cost (yuan / year) 600 Residential electricity charges (yuan / KWh) 0.2 Biochar unit price (yuan / g) 0.0065 Crushing machine electricity cost KWh 0.3 Labor cost (yuan / day) 200 Straw cost / yuan 363.89 Biochar cost / yuan 1194.19 Biochar mass / g 390000 Biochar price / yuan 2535 Profit / yuan 1340.81

[0200] (1) Calculate the total cost of biochar preparation: total cost = rice straw cost + straw crushing fee + carbonization furnace fee + labor fee. Based on the provided data, the calculated result is 1194.19 yuan;

[0201] (2) The cost and service life of the equipment used: According to the survey results, the cost of the crusher is RMB 1,500 per unit (the electricity consumption of crushing straw is 0.5-1.5 kWh / ton), and the service life is 50 years; the cost of the carbonization furnace is RMB 6,000 per unit, and the service life is 10 years;

[0202] (3) Collect and investigate local residents’ electricity prices and biochar prices: According to the survey results, local residents’ electricity prices are 0.2 yuan / KWh, and the biochar price is 3.25 yuan / catties;

[0203] (4) Calculate the cost of using a crusher to crush 1000 kg of straw: straw crushing fee = average daily cost of straw + crusher electricity fee. Based on the data in (2) and (3) in S233, the result is 30.3 yuan;

[0204] (5) According to the survey, the labor cost is 200 yuan / day, including the operation fee of the crusher and carbonization furnace;

[0205] (6) According to (1) in S233, 1000 kg of straw can produce 390 kg of biochar. According to the data of economic evaluation 1, the cost of 390 kg of biochar is calculated as follows: biochar cost = straw cost + straw crushing fee + carbonization furnace fee + labor fee, and the result is 1194.19 yuan;

[0206] (7) Calculate the market price of biochar made from 1000 kg of straw: Biochar price = Biochar unit price * Biochar mass. The data in (1) and (3) in S233 are calculated to be RMB 2535.

[0207] (8) Profit estimation: Profit = Biochar sales price - Total cost of biochar production. Based on the data in (1) and (6) in S233, the calculated result is RMB 1,340.81.

[0208] S234. As shown in Table 8, the energy and economic evaluation table for producing biogas from 1000 kg of rice straw, the five major calculation steps are as follows:

[0209] Table 8

[0210]

[0211]

[0212] (1) Calculate the total cost of biogas production: Total cost = rice straw cost + pond construction fee + management fee + maintenance fee + crushing fee + electricity fee. Based on the data provided, the result is 454.53 yuan;

[0213] (2) Collect data and conduct research to determine the local gas price: According to the research results, the local gas price is 2.4 yuan / m 3 ;

[0214] (3) Convert the mass of biogas produced by 1000 kg of rice straw into volume. The unit is cubic meter. According to the data provided, the biogas produced by 1000 kg of rice straw is 367.308 m3. 3 ;

[0215] (4) Calculate the market price of biogas produced from 1000kg of rice straw: Market price = volume * unit price. Based on the data in (2) and (3) in S234, the result is 367.308 cubic meters * 2.4 yuan / m 3 =881.54 yuan;

[0216] (5) Estimated profit: Profit = market gas price - total cost of biogas production. Based on the data in (1) and (4) in S234, the calculated result is RMB 881.54 - RMB 454.53 = RMB 427.01.

[0217] Write code that uses the economic evaluation method to evaluate the three different forms of energy conversion and utilization of rice straw in S1. This code can be run on Java and is used to evaluate the three different forms of energy conversion and utilization of rice straw based on the given economic evaluation method. The details are as follows:

[0218]

[0219]

[0220]

[0221] like Figure 6 As shown, the main logic of the code is as follows:

[0222] (1) First, define some variables, including diesel price, truck fuel consumption per kilometer, transportation distance, storage fees, labor costs and other cost-related parameters;

[0223] (2) Calculate the cost of rice straw based on the given cost parameters, including diesel cost, storage cost, and labor cost;

[0224] (3) Calculate the economic evaluation results of biomass fuel production based on the given straw price and weight, i.e., biomass profit;

[0225] (4) Calculate the economic evaluation results of biochar production energy, i.e., biochar cost and profit, based on the given total cost of biochar production, biochar selling price and quality;

[0226] (5) Calculate the economic evaluation results of biogas production energy, i.e., biogas profit, based on the given total cost of biogas production, gas price, and biogas volume;

[0227] (6) Finally, the evaluation results of each step are output.

[0228] This code is only used to calculate the given economic evaluation method and generate evaluation results based on the provided data. In actual application, it can be adjusted and expanded according to actual conditions.

[0229] S3, according to S1 and S2, the three main energy conversion resource forms of straw as biomass fuel, straw preparation of biochar, and straw preparation of biogas are converted and calculated according to the three evaluation methods of energy value, carbon footprint, and economy, and the green contribution is reconstructed with different weights, such as Figure 7 shown.

[0230] like Figure 8 As shown in Figure 2, the green contribution assessment steps are as follows:

[0231] (1) Determine the weight ratio of energy value analysis, carbon footprint assessment, and economic evaluation, and determine the importance of different indicators based on actual needs and trade-offs;

[0232] (2) According to the weight ratio, the data of energy value analysis, carbon footprint assessment and economic evaluation are weighted and calculated to obtain the green contribution. The green contribution conversion statistical analysis table is designed and prepared to ensure the accuracy and completeness of the data;

[0233] (3) Write the code for green contribution evaluation, and test and debug it to ensure the accuracy of the evaluation results.

[0234] (4) Develop a simple webpage or APP, embed the green contribution evaluation code into it, and conduct testing and optimization to provide a user-friendly interface and operation experience;

[0235] (5) Promote and apply this method and tool so that it can be used in research, production, and management related to rural agricultural waste treatment, providing a scientific basis and decision-making support for rural energy resource utilization.

[0236] As shown in Table 9, the green contribution calculation table for preparing biomass fuel, biochar and biogas from 1000kg of straw, the green contribution of preparing biomass fuel, biochar and biogas from 1000kg of straw is calculated as follows:

[0237] Table 9

[0238] energy Energy Carbon footprint Economic evaluation Green Contribution biomass 3250.26 1072.50 3510.11 2610.96 biochar 3250.26 1222.65 1340.81 1937.91 biogas 4012.67 5318.18 427.01 3252.62

[0239] (1) Green contribution of biomass fuel = (biomass energy value + biomass carbon footprint + biomass economic evaluation) / 3 = (3250.6 + 1072.5 + 3510.11) / 3 = 2610.96;

[0240] (2) Biochar green contribution = (biochar energy value + biochar carbon footprint + biochar economic evaluation) / 3 = (3250.26 + 1223.13 + 1340.81) / 3 = 1937.91;

[0241] (3) Biogas green contribution = (biogas energy value + biogas carbon footprint + biogas economic evaluation) / 3 = (4012.6 + 5318.1 + 427.01) / 3 = 3252.62.

[0242] Write a code to calculate the green contribution of 1000kg of straw to produce biomass fuel, biochar, and biogas. This code can be run on Java. The details are as follows:

[0243]

[0244]

[0245] In actual applications, this code is adjusted and expanded according to actual conditions, such as adding more energy types or adjusting the way of calculating green contribution. Figure 9 As shown in the figure, the green contribution of the three energy sources is calculated and the results are printed out as follows:

[0246] First, in the `main` method, call `calculateContribution` three times, passing in different energy values, including biomass fuel, biochar, and biogas. Each time `calculateContribution` is called, the parameters passed in are the energy value, carbon footprint, and economic assessment.

[0247] Secondly, in the `calculateContribution` method, the energy value, carbon footprint, and economic evaluation are added together and then divided by 3 to get an average value. This average value represents the green contribution of the energy source.

[0248] Finally, in the `main` method, use the `System.out.println` method to print the green contribution of each energy source to the console. Each output statement includes the energy type and the corresponding green contribution.

[0249] This study comprehensively analyzed the green contribution of rice straw biochar production based on an energy-carbon footprint-economy assessment method. The final calculation results are shown in Table 10, which summarizes the calculations for biomass fuel, biochar, and biogas produced from 1000 kg of rice straw. These results demonstrate that rice straw biochar exhibits good performance in terms of energy value, carbon footprint, and economy, and has a high green contribution to the environment. This provides a feasible approach for the comprehensive utilization of agricultural waste.

[0250] Table]0

[0251] energy Yield Calorific value Energy Carbon footprint Economic evaluation biomass 650.00kg 18.00MJ / kg 3250.26KWh / kg 1072.50kg 3510.11 yuan biochar 390.00kg 30.00MJ / kg 3250.26KWh / kg 1222.65kg 1340.81 yuan biogas 236.36kg <![CDATA[55.00MJ / m 2 ]]> 4012.67KWh / kg 5318.18kg 427.01 yuan

[0252] The above description is merely a preferred embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A method for evaluating the green contribution of biochar based on energy value, carbon footprint and economy, characterized by: The specific steps include: Collect theoretical calorific value information; Calculating the product output rate of straw energy using the theoretical calorific value information, wherein the straw energy includes biomass, biochar, and biogas; Using the energy value evaluation analysis method, the carbon footprint evaluation analysis method and the economic evaluation method respectively, the straw energy is evaluated according to the product output rate to obtain the energy value evaluation result, the carbon footprint evaluation result and the economic evaluation result; A green contribution is obtained based on the energy value evaluation result, the carbon footprint evaluation result, and the economic evaluation result.

2. The method for evaluating the green contribution of biochar based on energy value, carbon footprint and economy according to claim 1, wherein: The theoretical calorific value information includes the calorific value of rice straw, biomass, biochar, biogas and methane.

3. The method for evaluating the green contribution of biochar based on energy value, carbon footprint and economy according to claim 1, wherein: Calculating the product output rate of the straw energy using the theoretical calorific value information includes: Set target straw weight; Obtaining the theoretical yield of the straw energy according to the weight of the target straw and the theoretical calorific value information; collecting the moisture content and power consumption of the target straw, and obtaining the actual output of the straw energy based on the weight of the target straw; Based on the theoretical output and the actual output, the product output rate of the straw energy information is calculated.

4. The method for evaluating the green contribution of biochar based on energy value, carbon footprint and economy according to claim 1, wherein: Before evaluating the straw energy through the product output rate by respectively using the energy value evaluation and analysis method, the carbon footprint evaluation and analysis method, and the economic evaluation method, the following steps are included: collecting straw and obtaining the actual weight of the straw.

5. The method for evaluating the green contribution of biochar based on energy value, carbon footprint and economy according to claim 4, wherein: The energy value evaluation analysis method is used to evaluate the straw energy through the product output rate, and the energy value evaluation result is obtained including: Obtain energy value and calorific value conversion information; Obtaining the weight of the straw energy based on the actual weight of the straw and the product output rate; Obtaining the energy value evaluation result through the energy value and calorific value conversion information and the weight of the straw energy; The energy value assessment results include biomass energy value, biochar energy value and biogas energy value.

6. The method for evaluating the green contribution of biochar based on energy value, carbon footprint and economy according to claim 4, wherein: Using the carbon footprint assessment analysis method, the straw energy is assessed based on the product output rate, and obtaining the carbon footprint assessment results includes: Obtaining the weight of the straw energy based on the actual weight of the straw and the product output rate; collecting the carbon contents of the biomass and the biochar, and calculating the carbon weights of the biomass and the biochar based on the weights of the biomass and the biochar; Obtaining the methane content in the biogas, and obtaining the mass of the methane in the biogas by the weight of the biogas; Obtain the amount of carbon dioxide released when carbon fuel is completely burned; Calculating the theoretical carbon weight of the straw energy by the carbon weight of the biomass and the biochar, the mass of methane in the biogas, and the carbon dioxide release; Obtaining the correction coefficients of the biomass and the biochar, the GWP values ​​of carbon dioxide and methane, and using the theoretical carbon weight of the straw energy to obtain the carbon footprint of the straw energy; The carbon footprint assessment results include biomass carbon footprint, biochar carbon footprint and biogas carbon footprint.

7. The method for evaluating the green contribution of biochar based on energy value, carbon footprint and economy according to claim 4, wherein: The economic evaluation method is used to evaluate the straw energy by the product output rate, and the economic evaluation results obtained include: The economic evaluation results include biomass economic evaluation results, biochar economic evaluation results and biogas economic evaluation results; Obtaining the weight of the straw energy based on the actual weight of the straw and the product output rate; Calculating the cost of the straw; Collect diesel prices, storage fees, and labor costs, obtain fuel consumption of a vehicle loaded with the straw for a target distance, calculate freight, and then calculate the cost of the straw; Collecting the unit price of biomass fuel and the selling price of biomass fuel, and obtaining the biomass economic evaluation result based on the cost of the straw and the weight of the biomass; Collect equipment cost and years of use, residential electricity prices, and labor costs, calculate straw crushing fees and carbonization furnace fees, and obtain the biochar cost based on the straw cost and labor costs; Collecting the selling price of biochar, and obtaining the economic evaluation result of the biochar according to the cost of the biochar and the selling price of the biochar; Collect the pond construction fee, management fee, maintenance fee, crushing fee and electricity fee to calculate the total cost of biogas production; Collecting residential gas prices and calculating the market gas selling price based on the weight of the biogas; The biogas economic evaluation result is obtained through the total cost of biogas preparation and the market gas price.

8. The method for evaluating the green contribution of biochar based on energy value, carbon footprint and economy according to claim 1, wherein: Obtaining green contribution based on the energy value assessment result, the carbon footprint assessment result, and the economic assessment result includes: Determining the weight ratio of the emergy assessment result, the carbon footprint assessment result, and the economic assessment result; According to the weight ratio, the energy value assessment result, the carbon footprint assessment result and the economic assessment result are weighted and calculated to obtain the green contribution.

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