Carbon accounting method, device and equipment for sludge carbonization and medium

Abstract

The invention relates to the technical field of carbon accounting, in particular to a carbon accounting method, device and equipment for sludge carbonization and a medium. According to the method, raw material characteristics and product characteristics of raw materials in the fused salt heat storage system are obtained, then electric power emission factors of the fused salt heat storage system are adjusted to obtain target electric power emission factors, and finally, based on the product characteristics and the target electric power emission factors, the carbon emission value in the fused salt heat storage system is calculated. And the characteristics of the raw materials are dynamically adjusted by using the carbon emission value. According to the technical scheme, the accuracy of carbon emission accounting can be effectively improved.

Description

Technical Field

[0001] The present invention relates to the field of carbon accounting technology, and in particular to a carbon accounting method, device, equipment and medium for sludge carbonization. Background Art

[0002] Municipal sludge is the waste or by-product produced by the activated sludge method in sewage treatment plants. Its main components are organic matter, nutrients such as NPK, inorganic compounds such as heavy metals, parasite eggs, microorganisms such as bacteria and pathogens. It has the dual attributes of a pollutant and a resource, so it needs to be properly treated.

[0003] Under the current layout, the sludge carbonization process has the potential to help sludge treatment and disposal develop towards a "low-carbon" or even "negative carbon" model. However, given the current carbonization process raw material characteristics and differences in local economic levels and power structures, directly using default values ​​or emission factors to calculate system carbon emissions may result in significantly different results from actual conditions, resulting in low accuracy in carbon emission accounting.

[0004] Therefore, there is an urgent need for a carbon accounting method, device, equipment and medium for sludge carbonization to solve the above technical problems. Summary of the invention

[0005] The present invention provides a carbon accounting method, device, equipment and medium for sludge carbonization, which can effectively improve the accuracy of carbon emission accounting.

[0006] In a first aspect, an embodiment of the present invention provides a carbon accounting method for sludge carbonization, comprising:

[0007] Obtaining raw material characteristics and product characteristics of raw materials in the molten salt heat storage system; wherein the raw material characteristics include industrial analysis results and elemental analysis results, and the product characteristics include the calorific value of biochar, the calorific value of tar, the calorific value of pyrolysis gas, and the carbon content of biochar;

[0008] The power emission factor of the molten salt heat storage system is adjusted to obtain a target power emission factor; wherein the power emission factor includes an emission factor of a local power grid and an emission factor of non-grid-connected renewable energy power generation;

[0009] Based on the product characteristics and the target electricity emission factor, the carbon emission value in the molten salt heat storage system is calculated, so as to dynamically adjust the raw material characteristics by using the carbon emission value; wherein the carbon emission value includes direct carbon emission value, indirect carbon emission value, thermal energy compensation value and biocarbon compensation value.

[0010] In a second aspect, an embodiment of the present invention provides a carbon accounting device for sludge carbonization, comprising:

[0011] An acquisition unit is configured to acquire raw material characteristics and product characteristics of raw materials in the molten salt heat storage system; wherein the raw material characteristics include industrial analysis results and elemental analysis results, and the product characteristics include the calorific value of biochar, the calorific value of tar, the calorific value of pyrolysis gas, and the carbon content of biochar;

[0012] An adjustment unit is configured to adjust the power emission factor of the molten salt heat storage system to obtain a target power emission factor; wherein the power emission factor includes an emission factor of a local power grid and an emission factor of non-grid-connected new energy power generation;

[0013] A calculation unit is configured to calculate the carbon emission value in the molten salt heat storage system based on the product characteristics and the target electricity emission factor, so as to dynamically adjust the raw material characteristics by using the carbon emission value; wherein the carbon emission value includes a direct carbon emission value, an indirect carbon emission value, a thermal energy compensation value and a biocarbon compensation value.

[0014] In a third aspect, an embodiment of the present invention further provides an electronic device, including a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the method described in any embodiment of the present invention is implemented.

[0015] In a fourth aspect, an embodiment of the present invention further provides a computer-readable storage medium having a computer program stored thereon, which, when executed in a computer, enables the computer to execute the method described in any embodiment of the present invention.

[0016] It can be seen from the above scheme that the carbon accounting method, device, equipment and medium for sludge carbonization provided by the present invention obtains the raw material characteristics and product characteristics of the raw materials in the molten salt heat storage system, and then adjusts the power emission factor of the molten salt heat storage system to obtain the target power emission factor, and finally calculates the carbon emission value in the molten salt heat storage system based on the product characteristics and the target power emission factor, so as to dynamically adjust the raw material characteristics using the carbon emission value. Therefore, the above technical scheme can effectively improve the accuracy of carbon emission accounting. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A schematic diagram of a carbon accounting method for sludge carbonization provided by an embodiment of the present invention;

[0019] Figure 2 A schematic block diagram of a carbon accounting device for sludge carbonization provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0021] Figure 1 A schematic diagram of a carbon accounting method for sludge carbonization according to an embodiment is shown. It can be understood that the method can be executed by any device, equipment, platform, or equipment cluster with computing and processing capabilities, and the method includes:

[0022] Step 100, obtaining raw material characteristics and product characteristics of raw materials in the molten salt heat storage system; wherein the raw material characteristics include industrial analysis results and elemental analysis results, and the product characteristics include the calorific value of biochar, the calorific value of tar, the calorific value of pyrolysis gas, and the carbon content of biochar;

[0023] Step 102: Adjust the electricity emission factor of the molten salt heat storage system to obtain a target electricity emission factor; wherein the electricity emission factor includes the emission factor of the local power grid and the emission factor of non-grid-connected renewable energy power generation;

[0024] Step 104: Calculate the carbon emission value in the molten salt heat storage system based on product characteristics and target electricity emission factors, so as to dynamically adjust the raw material characteristics using the carbon emission value; wherein the carbon emission value includes direct carbon emission value, indirect carbon emission value, thermal energy compensation value and biocarbon compensation value.

[0025] In this embodiment, the raw material characteristics and product characteristics of the raw materials in the molten salt heat storage system are obtained, and then the power emission factor of the molten salt heat storage system is adjusted to obtain the target power emission factor. Finally, based on the product characteristics and the target power emission factor, the carbon emission value in the molten salt heat storage system is calculated to dynamically adjust the raw material characteristics using the carbon emission value. At present, due to the differences in the raw material characteristics of the carbonization process and the local economic level and power structure, the carbon emissions of the system are directly calculated using the default value or emission factor, and the calculation results may be greatly different from the actual situation. Therefore, the above technical solution can effectively improve the accuracy of carbon emission accounting.

[0026] In addition, at a time when the installed capacity of renewable energy power generation exceeds that of coal-fired units, compared with traditional carbonization reactors, the molten salt heat storage sludge carbonization reactor can solve the randomness, volatility, and intermittent problems of power generation using renewable energy sources such as wind power generation and photovoltaic power generation. It can store electricity and heat during the low-power consumption period and release it during the peak power consumption period, thereby improving the system's energy flexibility adjustment capabilities.

[0027] In some embodiments, due to differences in living standards in different regions and local municipal sewage treatment processes, there are large differences in the mud quality of the sludge raw materials used in the carbonization process, which is mainly manifested in large differences in the sludge moisture content and organic components, which affects the carbon emission level of the process. Based on local economic conditions, the raw material characteristics can be adjusted by blending biomass waste such as wood chips, rice husks, and straw to improve the process effect. In addition, biochar products are collected and utilized, and tar and pyrolysis gas products are transported to the secondary combustion chamber to recover heat energy. The heat energy required for the molten salt heat storage carbonization system is supplied by the heat recovery in the secondary combustion chamber and the power system.

[0028] In one embodiment of the present invention, non-grid-connected renewable energy power generation includes non-grid-connected wind power generation and non-grid-connected photovoltaic power generation, and the power emission factor is determined by the following formula:

[0029]

[0030] Where, EF 电耗 is the electricity emission factor of the molten salt thermal storage system, E wind is the direct power consumption of non-grid-connected wind power generation per unit sludge in the molten salt heat storage system, EF wind E is the emission factor of non-grid-connected wind power generation; solar is the electricity directly consumed by non-grid-connected photovoltaic power generation, EF solar is the emission factor of non-grid-connected photovoltaic power generation; E grid is the electrical energy consumed from the local grid, EF wind is the emission factor of the local power grid.

[0031] In some embodiments, emission factor data for each local power grid is shown in Table 1 (showing the name and power emission factor).

[0032] Table 1 Emission factor data table of local power grid

[0033] name <![CDATA[EF(tCO2 / MWh)]]> North China Power Grid 0.9652 Northeast Power Grid 1.0472 East China Power Grid 0.7703 Central China Power Grid 0.8771 Northwest Power Grid 0.9014 China Southern Power Grid 0.7738 Southwest Power Grid 0.5859 Wind power generation 0.0090(0.0070～0.0110) Photovoltaic power generation 0.0200(0.0100～0.0290)

[0034] In one embodiment of the present invention, the direct carbon emission value is determined by the following formula:

[0035]

[0036] In the formula, CE 直接 is the direct carbon emission value, V总 is the volume flow rate of waste gas generated per unit of raw material, F CO2 is the volume fraction of carbon dioxide in the exhaust gas, F CH4 is the volume fraction of methane in the exhaust gas, F N2O is the volume fraction of nitrous oxide in the exhaust gas, GWP CH4 is the greenhouse gas emission factor of methane, GWP N2O is the nitrous oxide greenhouse gas emission coefficient.

[0037] In this embodiment, the direct carbon emission value is mainly the carbon dioxide, methane and nitrous oxide released by the decomposition of the raw materials in the molten salt heat storage reactor. The gaseous and liquid products will be burned in the secondary combustion chamber to recover heat energy and emit waste gas. The relative content of greenhouse gases in the waste gas can be measured by the gas composition monitoring sensor and the direct carbon emission value can be calculated by the above formula.

[0038] In some embodiments, the non-carbon dioxide greenhouse gas content in the exhaust gas is extremely low, and the direct carbon emissions can also be approximately calculated by the following formula:

[0039]

[0040] Where M 原料 is the raw material feed mass, MC 原料 is the moisture content of raw materials, CF 原料 M is the carbon content of raw materials; 生物炭 is the quality of biochar products, MC 生物炭 is the moisture content of biochar, CF 生物炭 is the carbon content of biochar.

[0041] In one embodiment of the present invention, the indirect carbon emission value is determined by the following formula:

[0042]

[0043] In the formula, CE 间接 is the indirect carbon emission value, H 碳化 is the heat energy consumption of unit raw material in the molten salt heat storage system; η 热转化率 is the conversion rate of electricity to heat in the molten salt heat storage system.

[0044] In this embodiment, the indirect carbon emission value is mainly the indirect carbon emission generated by the electricity consumption in the carbonization process. The indirect carbon emission generated by the electricity consumption in the carbonization process is calculated by the above formula to obtain the indirect carbon emission value.

[0045] In one embodiment of the present invention, the thermal energy compensation value is determined by the following formula:

[0046]

[0047] In the formula, CE热能补偿 is the thermal energy compensation value, M 气 is the gas phase product quality, HHV 气 is the calorific value of the gas phase product, M 液 is the liquid product quality, HHV 液 is the calorific value of the liquid product, q 标煤 is the calorific value of standard coal, EF 标煤 is the standard coal emission factor, η 二燃 It is the heat utilization efficiency of the secondary combustion chamber.

[0048] In this embodiment, the thermal energy compensation includes the heat energy recovered by burning the liquid and gas products of the carbonization process in the secondary combustion chamber and the carbon compensation of the biochar products in the subsequent utilization process.

[0049] In one embodiment of the present invention, the biochar compensation value includes a biochar fuel value and a biochar carbon fixation value, and the biochar fuel value is determined by the following formula:

[0050]

[0051] The carbon fixation value of biochar is determined by the following formula:

[0052]

[0053] In the formula, CE 生物炭燃料 is the biochar fuel value, CE 生物炭燃料 is the carbon fixation value of biochar, DR is the proportion of biochar sequestered in the ground and naturally degraded carbon, R CH4 R is the ratio of methane in the gas produced by the anaerobic process of carbon degradation. CO2 The proportion of carbon dioxide in the gas produced by anaerobic processes for carbon degradation;

[0054] The carbon emission value is determined by the following formula:

[0055] CE 总 =CE 直接 +CE 间接 +CE 热能补偿 +CE 生物炭补偿 .

[0056] In this embodiment, based on the actual conditions faced by the sludge carbonization process, the raw material characteristics, power structure and utilization of carbonized products in the process are refined to enable the molten salt thermal storage system to select the overall carbon emission CE 总 As an optimization condition, the raw material characteristics are dynamically adjusted and a suitable combination of carbonized raw materials is selected to improve the accuracy of carbon emission accounting.

[0057] In some embodiments, CE 生物炭补偿A choice needs to be made by comparing the two main biochar product utilization pathways.

[0058] According to another embodiment, the present invention provides a carbon accounting device for sludge carbonization. Figure 2 A schematic block diagram of a carbon accounting device for sludge carbonization according to an embodiment is shown. It can be understood that the device can be implemented by any device, equipment, platform and device cluster with computing and processing capabilities. Figure 2 As shown, the device includes: an acquisition unit 200, an adjustment unit 202 and a calculation unit 204, wherein the main functions of each component unit are as follows:

[0059] The acquisition unit 200 is configured to acquire raw material characteristics and product characteristics of the raw materials in the molten salt heat storage system; wherein the raw material characteristics include industrial analysis results and elemental analysis results, and the product characteristics include the calorific value of biochar, the calorific value of tar, the calorific value of pyrolysis gas, and the carbon content of biochar;

[0060] The adjustment unit 202 is configured to adjust the power emission factor of the molten salt heat storage system to obtain a target power emission factor; wherein the power emission factor includes the emission factor of the local power grid and the emission factor of non-grid-connected new energy power generation;

[0061] The accounting unit 204 is configured to calculate the carbon emission value in the molten salt heat storage system based on product characteristics and target electricity emission factors, so as to dynamically adjust the raw material characteristics using the carbon emission value; wherein the carbon emission value includes direct carbon emission value, indirect carbon emission value, thermal energy compensation value and biocarbon compensation value.

[0062] In one embodiment of the present invention, the non-grid-connected renewable energy power generation includes non-grid-connected wind power generation and non-grid-connected photovoltaic power generation, and the power emission factor is determined by the following formula:

[0063]

[0064] Where, EF 电耗 is the electricity emission factor of the molten salt thermal storage system, E wind is the electric energy directly consumed by off-grid wind power generation per unit sludge in the molten salt thermal storage system, EF wind E is the emission factor of non-grid-connected wind power generation; solar is the electricity directly consumed by non-grid-connected photovoltaic power generation, EF solar is the emission factor of non-grid-connected photovoltaic power generation; E grid is the electrical energy consumed from the local grid, EF wind is the emission factor of the local power grid.

[0065] In one embodiment of the present invention, the direct carbon emission value is determined by the following formula:

[0066]

[0067] In the formula, CE 直接 is the direct carbon emission value, V 总 is the volume flow rate of waste gas generated per unit of raw material, F CO2 is the volume fraction of carbon dioxide in the exhaust gas, F CH4 is the volume fraction of methane in the exhaust gas, F N2O is the volume fraction of nitrous oxide in the exhaust gas, GWP CH4 is the greenhouse gas emission factor of methane, GWP N2O is the nitrous oxide greenhouse gas emission coefficient.

[0068] In one embodiment of the present invention, the direct carbon emission value is determined by the following formula:

[0069]

[0070] Where M 原料 is the raw material feed mass, MC 原料 is the moisture content of raw materials, CF 原料 M is the carbon content of raw materials; 生物炭 is the quality of biochar products, MC 生物炭 is the moisture content of biochar, CF 生物炭 is the carbon content of biochar.

[0071] In one embodiment of the present invention, the indirect carbon emission value is determined by the following formula:

[0072]

[0073] In the formula, CE 间接 is the indirect carbon emission value, H 碳化 is the heat energy consumption of unit raw material in the molten salt heat storage system; η 热转化率 is the conversion rate of electric energy to heat in the molten salt heat storage system.

[0074] In one embodiment of the present invention, the thermal energy compensation value is determined by the following formula:

[0075]

[0076] In the formula, CE 热能补偿 is the thermal energy compensation value, M 气 is the gas phase product quality, HHV 气 is the calorific value of the gas phase product, M 液 is the liquid product quality, HHV 液is the calorific value of the liquid product, q 标煤 is the calorific value of standard coal, EF 标煤 is the standard coal emission factor, η 二燃 It is the heat utilization efficiency of the secondary combustion chamber.

[0077] In one embodiment of the present invention, the biochar compensation value includes a biochar fuel value and a biochar carbon fixation value, and the biochar fuel value is determined by the following formula:

[0078]

[0079] The biochar carbon fixation value is determined by the following formula:

[0080]

[0081] In the formula, CE 生物炭燃料 is the biochar fuel value, CE 生物炭固碳 is the carbon fixation value of biochar, DR is the proportion of biochar sequestered in the ground and naturally degraded carbon, R CH4 R is the ratio of methane in the gas produced by the anaerobic process of carbon degradation. CO2 The proportion of carbon dioxide in the gas produced by anaerobic processes for carbon degradation;

[0082] The carbon emission value is determined by the following formula:

[0083] CE 总 =CE 直接 +CE 间接 +CE 热能补偿 +CE 生物炭补偿 .

[0084] According to another embodiment, there is also provided a computer-readable storage medium having a computer program stored thereon, which, when executed in a computer, causes the computer to execute a combination of Figure 1 The method described.

[0085] According to another embodiment of the present invention, an electronic device is provided, including a memory and a processor, wherein an executable code is stored in the memory, and when the processor executes the executable code, the Figure 1 method.

[0086] The various embodiments of the present invention are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0087] Those skilled in the art should be aware that in one or more of the above examples, the functions described in the present invention can be implemented by hardware, software, firmware or any combination thereof. When implemented by software, these functions can be stored in a computer-readable medium or transmitted as one or more instructions or codes on a computer-readable medium.

[0088] The above specific implementation methods further illustrate the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above are only specific implementation methods of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made on the basis of the technical solutions of the present invention should be included in the scope of protection of the present invention.

Claims

1. A carbon accounting method for sludge carbonization, characterized in that: include: Obtaining raw material characteristics and product characteristics of raw materials in the molten salt heat storage system; wherein the raw material characteristics include industrial analysis results and elemental analysis results, and the product characteristics include the calorific value of biochar, the calorific value of tar, the calorific value of pyrolysis gas, and the carbon content of biochar; The power emission factor of the molten salt heat storage system is adjusted to obtain a target power emission factor; wherein the power emission factor includes an emission factor of a local power grid and an emission factor of non-grid-connected renewable energy power generation; Based on the product characteristics and the target electricity emission factor, the carbon emission value in the molten salt heat storage system is calculated, so as to dynamically adjust the raw material characteristics by using the carbon emission value; wherein the carbon emission value includes direct carbon emission value, indirect carbon emission value, thermal energy compensation value and biocarbon compensation value.

2. The method according to claim 1, characterized in that The non-grid-connected renewable energy power generation includes non-grid-connected wind power generation and non-grid-connected photovoltaic power generation. The power emission factor is determined by the following formula: Where, EF 电耗 is the electricity emission factor of the molten salt thermal storage system, E wind is the electric energy directly consumed by off-grid wind power generation per unit sludge in the molten salt thermal storage system, EF wind E is the emission factor of non-grid-connected wind power generation; solar is the electricity directly consumed by non-grid-connected photovoltaic power generation, EF solar is the emission factor of non-grid-connected photovoltaic power generation; E grid is the electrical energy consumed from the local grid, EF wind is the emission factor of the local power grid.

3. The method according to claim 2, characterized in that The direct carbon emission value is determined by the following formula: Where, CE 直接 is the direct carbon emission value, V 总 is the volume flow rate of waste gas generated per unit of raw material, F CO2 is the volume fraction of carbon dioxide in the exhaust gas, F CH4 is the volume fraction of methane in the exhaust gas, F N2O is the volume fraction of nitrous oxide in the exhaust gas, GWP CH4 is the greenhouse gas emission factor of methane, GWP N2O is the nitrous oxide greenhouse gas emission coefficient.

4. The method according to claim 2, characterized in that: The direct carbon emission value is determined by the following formula: Where M 原料 is the raw material feed mass, MC 原料 is the moisture content of raw materials, CF 原料 M is the carbon content of raw materials; 生物炭 is the quality of biochar products, MC 生物炭 is the moisture content of biochar, CF 生物炭 is the carbon content of biochar.

5. The method according to claim 3 or 4, characterized in that: The indirect carbon emission value is determined by the following formula: Where, CE 间接 is the indirect carbon emission value, H 碳化 is the heat energy consumption of unit raw material in the molten salt heat storage system; η 热转化率 is the conversion rate of electric energy to heat in the molten salt heat storage system.

6. The method according to claim 5, characterized in that The thermal energy compensation value is determined by the following formula: Where, CE 热能补偿 is the thermal energy compensation value, M 气 is the gas phase product quality, HHV 气 is the calorific value of the gas phase product, M 液 is the liquid product quality, HHV 液 is the calorific value of the liquid product, q 标煤 is the calorific value of standard coal, EF 标煤 is the standard coal emission factor, η 二燃 It is the heat utilization efficiency of the secondary combustion chamber.

7. The method according to claim 6, characterized in that The biochar compensation value includes a biochar fuel value and a biochar carbon fixation value, and the biochar fuel value is determined by the following formula: The biochar carbon fixation value is determined by the following formula: Where, CE 生物炭燃料 is the biochar fuel value, CE 生物炭固碳 is the carbon fixation value of biochar, DR is the proportion of biochar sequestered in the ground and naturally degraded carbon, R CH4 R is the ratio of methane in the gas produced by the anaerobic process of carbon degradation. CO2 The proportion of carbon dioxide in the gas produced by anaerobic processes for carbon degradation; The carbon emission value is determined by the following formula: WHAT 总 =EC 直接 +CE 间接 +CE 热能补偿 +CE 生物炭补偿 。 8. A carbon accounting device for sludge carbonization, characterized in that: include: An acquisition unit is configured to acquire raw material characteristics and product characteristics of raw materials in the molten salt heat storage system; wherein the raw material characteristics include industrial analysis results and elemental analysis results, and the product characteristics include the calorific value of biochar, the calorific value of tar, the calorific value of pyrolysis gas, and the carbon content of biochar; An adjustment unit is configured to adjust the power emission factor of the molten salt heat storage system to obtain a target power emission factor; wherein the power emission factor includes an emission factor of a local power grid and an emission factor of non-grid-connected new energy power generation; A calculation unit is configured to calculate the carbon emission value in the molten salt heat storage system based on the product characteristics and the target electricity emission factor, so as to dynamically adjust the raw material characteristics by using the carbon emission value; wherein the carbon emission value includes a direct carbon emission value, an indirect carbon emission value, a thermal energy compensation value and a biocarbon compensation value.

9. An electronic device, characterized in that: The method comprises a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the method according to any one of claims 1 to 7 is implemented.

10. A computer-readable storage medium, characterized in that: A computer program is stored thereon, and when the computer program is executed in a computer, the computer is caused to execute the method according to any one of claims 1 to 7.

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