Fused salt carbonization method and system based on combustible gas component regulation and control

Abstract

The invention belongs to the technical field of biomass energy, and discloses a combustible gas component regulation-based fused salt carbonization method, which comprises the following steps: constructing a biomass carbonization product generation model; determining a correlation mechanism between the biomass product and heat; forming an association rule of the flow, the temperature and the heat of the molten salt; on the basis of the correlation mechanism obtained in the steps S2 and S3, a biomass product and molten salt flow and temperature regulation and control model can be established. Based on the calorific value of the target biochar, the content and real-time concentration of the corresponding synchronously generated gaseous product can be obtained, and the corresponding heat required for completing the whole carbonization process can be looked up. Molten salt can supply heat to biomass in the biomass heat exchange process, and heat release can cause the temperature of the molten salt to be reduced. Therefore, by detecting the real-time temperature of the molten salt, the flow of the molten salt is regulated and controlled according to the heat required in the carbonization process.

Description

Technical Field

[0001] The present invention belongs to but is not limited to the field of biomass energy technology, and in particular relates to a molten salt carbonization method and system based on the regulation of combustible gas components. Background Art

[0002] Biomass energy is the world's fourth largest energy source after the three major fossil energy sources. It is also the only carbon source among renewable energy sources and has the characteristics of carbon neutrality. Biomass carbonization technology is to heat biomass and slowly decompose it to produce solid coke under inert and anoxic conditions, which can achieve dual recovery of matter and energy. The biomass carbonization process is an endothermic process and consumes a lot of heat. Among the many heat supply methods, molten salt heat storage technology is to heat solid inorganic salts to above their melting point to form a liquid molten system to achieve efficient heat storage. Molten salt heat storage coupled with biomass carbonization technology can effectively reduce the cost of biomass carbonization. However, the biomass carbonization process is sensitive to temperature. Too high or too low temperature will affect the decomposition process of biomass macromolecules, and then affect the yield and quality of biochar, which indicates that the heat of molten salt must be accurately matched with it. Therefore, there is an urgent need for a molten salt carbonization method based on the regulation of combustible gas components. Summary of the invention

[0003] In view of the problems existing in the prior art, the present invention provides a molten salt carbonization method based on the regulation of combustible gas components.

[0004] The present invention is achieved by a molten salt carbonization method based on the regulation of combustible gas components, the method comprising:

[0005] S1: Construct a model for the generation of biomass carbonization products;

[0006] S2: clarify the mechanism of the relationship between biomass products and heat;

[0007] S3: The correlation between the flow rate, temperature and heat of molten salt;

[0008] S4: Based on the correlation mechanism obtained in steps S2 and S3, a biomass product and molten salt flow and temperature control model can be established.

[0009] Further, the S1 specifically includes:

[0010] Based on the machine learning method, the specific heat capacity parameters of biomass are obtained, and the correlation between the products and temperature of the biomass carbonization process is obtained (within the range of 500-800°C). The gaseous products include four small molecular gases, CO2, CO, H2, and CH4, and the solid product is biochar. The following curve relationship can be further obtained: the horizontal axis is temperature (°C), the left vertical axis is the total content (%) and real-time concentration (mg / cm -3), the right vertical axis is the calorific value of biochar (MJ / kg).

[0011] Further, the S2 specifically includes:

[0012] Based on the content and temperature changes of gaseous products during carbonization, the heat required for biomass carbonization can be further calculated if the biomass input mass and average specific heat capacity parameters are known; the following curve relationship under different input mass conditions can be obtained: the horizontal axis is the input heat (MJ), and the vertical axis is the total content (%) and real-time concentration (mg / cm -3 ).

[0013] Further, the S3 specifically includes:

[0014] Based on the test, the specific heat capacity parameters of the molten salt at different temperatures can be obtained; according to the formula Q=mcΔt, a correlation model of the molten salt flow, temperature and heat at different temperatures can be established.

[0015] Further, the S4 specifically includes:

[0016] Based on the calorific value of the target biochar, the content and real-time concentration of the corresponding gaseous products generated simultaneously can be known, and the corresponding heat required to complete the entire carbonization process can be checked; the molten salt will supply heat to the biomass during the heat exchange process of the biomass, and the heat release will cause the molten salt temperature to drop; therefore, by detecting the real-time temperature of the molten salt, the molten salt flow rate can be regulated according to the heat required for the carbonization process.

[0017] Another object of the present invention is to provide a molten salt carbonization system based on combustible gas component regulation based on the molten salt carbonization method based on combustible gas component regulation, the system specifically comprising:

[0018] A generation model building module is used to build a biomass carbonization product generation model;

[0019] The mechanism clarification module is connected with the generative model building module to clarify the association mechanism between biomass products and heat;

[0020] The regularity association module is connected with the generation model building module to form the regularity of association between molten salt flow, temperature and heat;

[0021] The control model establishment module is connected with the mechanism clarification module and the law association module, and based on the association mechanism and law, a biomass product and molten salt flow and temperature control model is established.

[0022] Another object of the present invention is to provide a computer device, which includes a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor executes the steps of the molten salt carbonization method based on the regulation of combustible gas components.

[0023] Another object of the present invention is to provide a computer-readable storage medium storing a computer program, which, when executed by a processor, enables the processor to execute the steps of the molten salt carbonization method based on the regulation of combustible gas components.

[0024] Another object of the present invention is to provide an information data processing terminal, which is used to implement the molten salt carbonization system based on combustible gas component regulation as described above.

[0025] In combination with the above technical solutions and the technical problems solved, the advantages and positive effects of the technical solutions to be protected by the present invention are as follows:

[0026] First, the present invention effectively solves the technical problem that the existing biomass carbonization process is sensitive to temperature, and that too high or too low temperature will affect the decomposition process of biomass macromolecules, thereby affecting the yield and quality of biochar. Based on the calorific value of the target biochar, the corresponding content and real-time concentration of the synchronously generated gaseous products can be obtained, and the corresponding required heat to complete the entire carbonization process can be consulted. In the process of heat exchange with biomass, molten salt will supply heat to biomass, and heat release will cause the temperature of the molten salt to drop. Therefore, by detecting the real-time temperature of the molten salt, the molten salt flow rate can be regulated according to the required heat for the carbonization process.

[0027] Second, the technical solution of the present invention can be used for molten salt energy storage coupled with solid waste thermal treatment technology to achieve accurate matching of energy supply and demand in the solid waste thermal treatment process, and help prepare high-value fuels from solid waste. With the help of machine learning methods, a biomass pyrolysis energy consumption data model is constructed based on the gas evolution characteristics of multi-biomass, and then an innovative energy supply mechanism is proposed based on the energy consumption model to achieve accurate dynamic regulation of the molten salt flow rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a flow chart of a molten salt carbonization method based on combustible gas component regulation provided by an embodiment of the present invention;

[0029] Figure 2 This is a structural diagram of a molten salt carbonization system based on combustible gas component regulation provided by an embodiment of the present invention;

[0030] In the figure: 1. Generate model building module; 2. Mechanism clarification module; 3. Rule association module; 4. Regulation model establishment module. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0032] like Figure 1 As shown, an embodiment of the present invention provides a molten salt carbonization method based on combustible gas component regulation, the method comprising:

[0033] S1: Construct a model for the generation of biomass carbonization products;

[0034] S2: clarify the mechanism of the relationship between biomass products and heat;

[0035] S3: The correlation between the flow rate, temperature and heat of molten salt;

[0036] S4: Based on the correlation mechanism obtained in steps S2 and S3, a biomass product and molten salt flow and temperature control model can be established.

[0037] In this stage, the pyrolysis reaction process of biomass under different temperature and environmental conditions is analyzed through experiments and numerical simulations, and a model for the generation of carbonized products is established. This model can describe the proportion of solid phase (biochar), liquid phase (tar) and gas phase (combustible gas) produced by the decomposition of biomass in a molten salt environment, and determine the reaction rate and material migration characteristics in combination with kinetic parameters.

[0038] This stage focuses on analyzing the input, transfer and distribution of heat during biomass carbonization, studying the energy required for pyrolysis and the thermal effect of product generation. Through experimental determination of product distribution at different temperatures and heating rates, a mathematical correlation model between biomass products and heat supply is established to optimize thermal energy utilization efficiency and improve the selectivity of target products.

[0039] In the molten salt carbonization process, the molten salt acts as a heat carrier and can also participate in mass transfer and catalysis, so it is necessary to clarify the relationship between its flow rate, temperature and the thermal balance of the system. By regulating the flow rate, temperature gradient and contact time of the molten salt, the effects on the carbonization rate, product distribution and reaction thermodynamics are studied to obtain the optimal operating parameters of the molten salt system.

[0040] Combined with the correlation between heat and molten salt parameters obtained in the second and third stages, a control model for biomass products changing with molten salt flow and temperature is further established. This model can be used to predict product composition and energy conversion efficiency under different working conditions, achieve precise control of the biomass carbonization process, improve the quality of carbonization products and the adjustability of combustible gas components to meet different application requirements.

[0041] The S1 specifically includes:

[0042] Based on the machine learning method, the specific heat capacity parameters of biomass are obtained, and the correlation between the products and temperature of the biomass carbonization process is obtained (within the range of 500-800°C). The gaseous products include four small molecular gases, CO2, CO, H2, and CH4, and the solid product is biochar. The following curve relationship can be further obtained: the horizontal axis is temperature (°C), the left vertical axis is the total content (%) and real-time concentration (mg / cm -3 ), the right vertical axis is the calorific value of biochar (MJ / kg).

[0043] The S2 specifically includes:

[0044] Based on the content and temperature changes of gaseous products during carbonization, the heat required for biomass carbonization can be further calculated if the biomass input mass and average specific heat capacity parameters are known; the following curve relationship under different input mass conditions can be obtained: the horizontal axis is the input heat (MJ), and the vertical axis is the total content (%) and real-time concentration (mg / cm -3 ).

[0045] The S3 specifically includes:

[0046] Based on the test, the specific heat capacity parameters of the molten salt at different temperatures can be obtained; according to the formula Q=mcΔt, a correlation model of the molten salt flow, temperature and heat at different temperatures can be established.

[0047] The S4 specifically includes:

[0048] Based on the calorific value of the target biochar, the content and real-time concentration of the corresponding gaseous products generated simultaneously can be known, and the corresponding heat required to complete the entire carbonization process can be checked; the molten salt will supply heat to the biomass during the heat exchange process of the biomass, and the heat release will cause the molten salt temperature to drop; therefore, by detecting the real-time temperature of the molten salt, the molten salt flow rate can be regulated according to the heat required for the carbonization process.

[0049] Using machine learning methods, we first collected experimental data at various temperature points during the carbonization process of biomass at 500-800 °C, including the total content and real-time concentration data of gaseous products (CO2, CO, H2, CH4) (unit: mg / cm 3 ) and the calorific value data of biochar (unit: MJ / kg), and obtain the specific heat capacity parameters of biomass. Through data fitting, a mathematical model with temperature as the horizontal axis, gaseous product generation (% and concentration) on the left vertical axis and biochar calorific value on the right vertical axis was constructed to form a product generation curve based on temperature changes.

[0050] During the carbonization process, the heat required for biomass carbonization is calculated by the heat balance formula based on the experimentally measured gaseous product content and temperature change data, combined with the known biomass input mass and its average specific heat capacity parameters. With the input heat (unit: MJ) as the horizontal axis, the functional relationship between the total content of gaseous products and the real-time concentration under different input mass conditions is established to form a correlation mechanism model between heat and product generation.

[0051] The molten salt is tested at different temperatures to obtain its specific heat capacity parameter data. According to the formula Q = mcΔt, the test data is used to establish a mathematical correlation model of molten salt flow (unit: kg / s or L / s), temperature (℃) and transferred heat (MJ). By fitting the experimental data, a quantitative relationship curve between molten salt flow, temperature and heat in a certain temperature range is formed.

[0052] Based on the correlation mechanism between the heat required for biomass carbonization and product generation obtained in step 2, and the correlation law between molten salt flow, temperature and heat in step 3, combined with the target biochar calorific value requirements, a mathematical model for regulating the biomass product and molten salt flow and temperature is established. The model calculates the molten salt flow parameters that need to be adjusted by inputting the target product parameters and measuring the molten salt temperature in real time.

[0053] In the actual operation process, the temperature, flow rate and related heat data of the molten salt are collected in real time through sensors, and the data of the generation of biomass carbonization products are monitored. Using these data, the parameters of the mathematical model established in steps 1 to 4 are calibrated to ensure that the data input and output between the models have good consistency and accuracy, thus forming a closed-loop data collection and calibration system.

[0054] The method includes constructing a biomass carbonization product generation model, clarifying the relationship between biomass products and heat, forming the relationship between molten salt flow, temperature and heat, and establishing a biomass product and molten salt flow and temperature control model based on the above-mentioned relationship mechanism. Parameter transmission and information exchange are achieved through data collection and model correction between each step, forming a complete and closed-loop mathematical model system from biomass input to molten salt control.

[0055] like Figure 2 As shown, an embodiment of the present invention provides a molten salt carbonization system based on combustible gas component regulation based on the molten salt carbonization method based on combustible gas component regulation, and the system specifically includes:

[0056] A generation model building module 1 is used to build a biomass carbonization product generation model;

[0057] Mechanism clarification module 2, connected with the generative model building module, is used to clarify the association mechanism between biomass products and heat;

[0058] The rule association module 3 is connected with the generation model building module to form the association rule of molten salt flow, temperature and heat;

[0059] The control model establishment module 4 is connected with the mechanism clarification module 2 and the law association module 3, and a biomass product and molten salt flow and temperature control model is established based on the association mechanism and law.

[0060] The molten salt carbonization system based on combustible gas component regulation provided by the present invention includes four main modules: a generation model construction module 1, a mechanism clarification module 2, a law association module 3 and a regulation model establishment module 4. The modules are interconnected through physical or data interfaces to form a closed-loop data acquisition, processing and model establishment system for realizing automated modeling of the relationship between the biomass carbonization process and the molten salt parameters.

[0061] The generation model construction module 1 is used to construct a biomass carbonization product generation model. This module uses a preset machine learning algorithm to collect and fit the data of gaseous products (CO2, CO, H2, CH4) and solid products (biochar) generated during the carbonization process of biomass at 500°C to 800°C, establish a mathematical relationship between temperature and product generation data, and generate a corresponding curve data model.

[0062] The mechanism clarification module 2 is connected to the generation model construction module 1. The module uses the biomass input mass and average specific heat capacity parameters to establish the mathematical relationship between heat input and product generation during the biomass carbonization process through data processing. The module outputs a set of quantitative data and curve models that describe the relationship between heat and gaseous and solid products.

[0063] The regularity association module 3 is connected to the generation model building module 1. The module performs statistical analysis on the specific heat capacity test data of the molten salt under different temperature conditions, establishes a correlation model between the molten salt flow rate, temperature and transferred heat according to the heat transfer formula Q=mcΔt, and forms corresponding mathematical expressions and curve data to describe the quantitative relationship between the molten salt parameters and heat.

[0064] The control model establishment module 4 is connected with the mechanism clarification module 2 and the law association module 3. Based on the aforementioned established association mechanism and law, this module constructs a control mathematical model between the biomass carbonization products and the molten salt flow and temperature control parameters through data integration and model fusion, forming a complete control data system, providing parameter basis for the real-time control of molten salt flow and temperature.

[0065] The present invention also provides a computer device, which includes a memory and a processor, wherein the memory stores a computer program for implementing the above-mentioned molten salt carbonization method, and the processor performs data processing and model building according to the above-mentioned steps when executing the program; at the same time, the present invention provides a computer-readable storage medium and an information data processing terminal, which are used to implement and run the above-mentioned system, and information sharing and collaborative processing are achieved between various devices through a data communication interface.

[0066] The molten salt carbonization system based on combustible gas component regulation of the present invention can be widely used in the fields of biomass energy, environmental protection, resource recycling, etc., and is particularly suitable for the following related products and industries:

[0067] 1) Preparation of biomass carbon-based materials: The system can be used to produce high-quality biomass carbon materials, such as agricultural waste charcoal, bamboo charcoal, wood charcoal, etc., which are widely used in agricultural soil improvement, adsorption materials and environmentally friendly filter media.

[0068] 2) Renewable energy production: This technology can be used to optimize the biomass pyrolysis gasification process, increase the yield of combustible gases such as hydrogen (H2) and methane (CH4), thereby increasing the calorific value of biomass gas and applying it to clean energy supply.

[0069] 3) Carbon fixation and carbon capture: By precisely controlling the temperature and molten salt flow rate during the biomass carbonization process, the biochar yield can be increased and the carbon fixation capacity can be enhanced.

[0070] 4) Coal substitution and new energy development: The system can be applied to the production of biomass carbonization fuel, so that biochar can replace traditional coal in industrial combustion, metallurgy, power plant energy supply, etc., improve the utilization rate of renewable fuels, and reduce fossil energy consumption.

[0071] The molten salt carbonization system of the present invention achieves superior effects that cannot be achieved by traditional biomass pyrolysis technology through the following technical means:

[0072] 1) Improving combustible gas component selectivity: Experiments show that compared with the traditional biomass pyrolysis system, the present invention increases the proportion of high calorific value gases such as H2 and CH4 by 20%-30% through precise control of the molten salt flow rate and temperature, thereby improving the gas quality.

[0073] 2) Optimizing biochar yield: Through comparative experiments, the molten salt carbonization method of this system can increase the biochar yield by about 10%-15%, improve its pore structure, and increase the specific surface area, making it have better application value in soil improvement and catalyst carrier.

[0074] 3) Improve thermal energy utilization efficiency: Compared with the traditional direct-heat pyrolysis process, the present invention utilizes the high specific heat capacity and stable heat transfer characteristics of molten salt to improve the uniformity of heat transfer, increase the pyrolysis efficiency by about 25%, and reduce the energy consumption cost of the system.

[0075] 4) Intelligent control and model optimization: This system realizes intelligent control of the carbonization process through machine learning and big data analysis. Test results show that the control model built based on this system can reduce the prediction error of the target product to less than 5%, ensuring process stability and product quality consistency.

[0076] The above experimental data are derived from actual test results in laboratory pilot and pilot stages. Further industrial application verification is underway to ensure the feasibility and applicability of the technology.

[0077] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any modifications, equivalent substitutions and improvements made by any technician familiar with the technical field within the technical scope disclosed by the present invention and within the spirit and principle of the present invention should be covered by the protection scope of the present invention.

Claims

1. A molten salt carbonization method based on combustible gas component regulation, characterized in that: The method includes: S1. Obtain the specific heat capacity parameters of biomass based on machine learning methods, and establish the curve relationship between gaseous products and temperature and solid products during biomass carbonization in the range of 500°C to 800°C; S2. Based on the gaseous product content and temperature changes measured during the carbonization process, the known biomass input mass and average specific heat capacity parameters, calculate the heat required for the biomass carbonization process, and establish a curve relationship between the input heat and the total content and real-time concentration of the gaseous product generated; S3. The specific heat capacity parameters of the molten salt at different temperatures are obtained through testing, and a correlation model between the molten salt flow rate, temperature and heat is established according to the formula Q=mcΔt.

2. The molten salt carbonization method according to claim 1, characterized in that: In the step S1, the curve relationship established has temperature (°C) as the horizontal axis, the total content (%) and real-time concentration (mg / cm-3) of gaseous products as the left vertical axis, and the calorific value (MJ / kg) of biochar as the right vertical axis.

3. The molten salt carbonization method according to claim 1, characterized in that: In the step S2, the heat calculated by the known biomass input mass and average specific heat capacity parameters forms a curve relationship with the input heat (MJ) as the horizontal axis and the total content (%) and real-time concentration (mg / cm-3) of gaseous products generated as the vertical axis.

4. The molten salt carbonization method according to claim 1, characterized in that: In the step S3, the specific heat capacity parameters of the molten salt at different temperatures are obtained through testing, and a mathematical correlation model between the molten salt flow rate, temperature and heat is established using the formula Q=mcΔt.

5. The molten salt carbonization method according to claim 1, characterized in that: The machine learning method is used in the process of obtaining the specific heat capacity parameters of biomass, and adopts data acquisition and fitting algorithms to determine the gaseous products and biochar generation data at various temperature points during the biomass carbonization process.

6. The molten salt carbonization method according to claim 1, characterized in that: In the process of establishing the molten salt flow rate, temperature and heat correlation model, the mathematical expression between the molten salt flow rate, temperature and heat is determined by statistically processing the specific heat capacity test data of the molten salt under multiple temperature conditions.

7. A molten salt carbonization system based on combustible gas component regulation based on the molten salt carbonization method based on combustible gas component regulation as described in claims 1-6, characterized in that: The system specifically includes: A generation model building module is used to build a biomass carbonization product generation model; The mechanism clarification module is connected with the generative model building module to clarify the association mechanism between biomass products and heat; The regularity association module is connected with the generation model building module to form the regularity of association between molten salt flow, temperature and heat; The control model establishment module is connected with the mechanism clarification module and the law association module, and based on the association mechanism and law, a biomass product and molten salt flow and temperature control model is established.

8. A computer device, characterized in that: The computer device includes a memory and a processor, the memory stores a computer program, and when the computer program is executed by the processor, the processor executes the steps of the molten salt carbonization method based on combustible gas component regulation as described in any one of claims 1-6.

9. A computer-readable storage medium storing a computer program, wherein when the computer program is executed by a processor, the processor executes the steps of the molten salt carbonization method based on combustible gas component regulation as claimed in any one of claims 1 to 6.

10. An information data processing terminal, characterized in that: The information data processing terminal is used to implement the molten salt carbonization system based on combustible gas component regulation as described in claim 7.

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