Activated carbon fiber adsorbent adsorption heat release simulation method based on multi-physics field coupling

Abstract

The invention relates to the technical field of adsorption heat release simulation of adsorbents, discloses an activated carbon fiber adsorbent adsorption heat release simulation method based on multi-physics field coupling, and aims to comprehensively and accurately simulate various physical effects involved in the adsorption process, especially the dynamic change and transfer rule of an adsorption heat release phenomenon. By establishing a multi-physical field coupling model and comprehensively considering a plurality of physical processes such as fluid flow, heat conduction and substance diffusion, high-precision simulation and prediction of internal energy and substance change of the adsorption bed are realized. The method can accurately capture the temperature distribution on the surface and inside of the active carbon fiber in the adsorption process and the concentration change of adsorbate, and further reveals the generation, diffusion and dissipation mechanism of adsorption heat. The multi-physical field coupling method provides solid theoretical basis and technical support for innovation and development of the adsorption technology.

Description

Technical Field

[0001] The invention relates to the technical field of adsorbent adsorption exothermic simulation, and in particular to a method for simulating adsorption exothermic release of an activated carbon fiber adsorbent based on multi-physical field coupling. Background Art

[0002] Activated carbon fiber (ACF) is an efficient adsorption material. It is widely used in air purification, waste gas treatment and energy storage due to its extremely high specific surface area and developed microporous structure. During the adsorption process, ACF captures adsorbate molecules through physical or chemical effects. However, this adsorption process is usually accompanied by significant heat release. If the heat release is not effectively controlled in time, the surface temperature of the adsorbent will rise rapidly, resulting in a decrease in adsorption capacity and even damage to the structural integrity of the material, reducing its service life. Therefore, in-depth research and simulation analysis of the ACF adsorption heat release process is of extremely important practical significance.

[0003] Multi-physics coupling simulation technology provides a powerful tool for this complex process. Traditional single physical field models cannot fully reveal the multiple interactions in the adsorption process, while multi-physics coupling can simultaneously consider multiple physical phenomena, such as fluid flow, heat conduction, material diffusion, phase change and other processes, so as to make more accurate predictions and optimizations for the entire system. By building a coupling model, the heat accumulation and transfer accompanying the adsorption process and its impact on material properties can be studied.

[0004] In addition, the coupled simulation method can simulate the system behavior under different working conditions, including changes in external conditions such as temperature, pressure, flow rate and concentration, so as to optimize the design and operation process of the ACF adsorbent. For example, as the adsorption proceeds, the local temperature change of the ACF will affect the regeneration efficiency of the adsorbent and the transfer of the adsorption equilibrium. Through multi-physics field coupling simulation, the interaction of different physical fields can be clarified, providing a more reasonable basis for the control strategy of the system, so as to find the best balance between adsorption, heat release and mass transfer. In summary, multi-physics field coupling simulation technology can fully reveal the adsorption and heat release mechanism of activated carbon fiber adsorbents, and provide important theoretical support for future engineering design and application optimization.

[0005] Therefore, in order to solve the problems that the existing adsorbent adsorption and exothermic performance testing experimental procedures are complicated, time-consuming and costly, the present invention proposes an activated carbon fiber adsorbent adsorption and exothermic performance simulation method based on multi-physical field coupling. Summary of the invention

[0006] The present invention performs multi-physics field coupling simulation of adsorbent adsorption based on COMSOL Multiphysic software, and provides a method for model establishment and effective solution using the software. The purpose of the method is to use the simulation method to establish a correct simulation model, and use the results output by the model to compare with the experiment, so as to effectively obtain real-time data of the adsorbent adsorption process, and the real-time data includes adsorbent temperature data, adsorbent adsorption capacity data, wet air temperature data, and wet air relative humidity data. In addition, adsorption heat transfer data and adsorbent mass transfer data of the adsorbent can be obtained through post-processing, which shortens the manpower, material resources and costs required for the experiment.

[0007] The specific technical solution adopted by the present invention to solve the technical problem is:

[0008] 1. A method for simulating the adsorption and exothermic reaction of activated carbon fiber adsorbent based on multi-physics field coupling, using COMSOL Multiphysics to simulate the adsorption and exothermic reaction of activated carbon fiber adsorbent in multi-physics fields; comprising the following steps:

[0009] S1: Establishment of a three-dimensional model of adsorbent adsorption exothermicity based on COMSOL Multiphysic: The model includes a simplified rectangular wave adsorbent model and an ambient air domain;

[0010] Based on the interaction between the heat and mass transfer process of adsorbent adsorption and the air laminar flow, the diffusion capillary model is used to describe the water transport process in hygroscopic porous media.

[0011] S2: Material setting: Use relevant instruments to measure and obtain relevant thermodynamic parameters of adsorbents;

[0012] S3: Setting boundary conditions, including the inlet air velocity, temperature, relative humidity, adsorbent adsorption heat formula and other basic parameters and functions;

[0013] S4: Perform multi-physics field settings, including fluid mechanics, thermodynamics, laminar flow, heat and moisture transfer in multi-physics fields, and non-isothermal moisture flow coupling;

[0014] S5: Set up mesh division and verify mesh independence;

[0015] S6: Perform solver settings, set the separation solver to use tolerance as a parameter to control equation termination, and perform transient calculations.

[0016] S7: Verify the accuracy of simulation results through experiments.

[0017] Furthermore, S1 is specifically as follows: the model is simplified according to the real rectangular wave adsorbent, and the single channel of the actual adsorption bed is used as the research object for modeling in COMSOL Multiphysic. After simplifying the single channel model, at least the adsorbent layer and the air domain inside the adsorbent are retained; and an inlet is added to the air domain opening on the wall in front of the adsorbent layer, and an outlet is added to the air domain opening on the wall at the other end of the adsorbent layer to define the flow direction of the humid air. Considering that the adsorbent will generate a large amount of adsorption heat when adsorbed in a humid air environment, the adsorption heat formula is defined in the adsorbent layer as a heat source to simulate the entire adsorption simulation process.

[0018] Furthermore, the relevant material thermodynamic parameters in S2 include: thermal conductivity of porous media, specific heat capacity of porous media, density of porous media, pore radius, inlet capillary pressure, pore size distribution index, air density, air viscosity, water density, water viscosity, and permeability.

[0019] Furthermore, S3 includes boundary condition settings and function settings: setting step function, fiber inlet boundary, fiber outlet boundary, and porous medium integral makes the model easier to converge.

[0020] Further, S4 includes the following steps:

[0021] S4.1: Set up the laminar flow interface;

[0022] S4.2: Set up an interface for transferring moisture from the air;

[0023] S4.3: Set up the humid air heat transfer interface;

[0024] S4.4: Set up multiphysics: Add multiphysics - moisture flow, select all domains, set the coupling interface to laminar flow and moisture transport in air; heat and moisture, select all domains, set the coupling interface to humid air heat transfer and moisture transport in air; non-isothermal flow, select all domains, set the coupling interface to humid air heat transfer and moisture transport in air;

[0025] Furthermore, setting the laminar flow interface specifically includes:

[0026] S4.1.1: In the Laminar Flow interface, set the air domain to laminar flow, enable the porous media domain, select Incompressible flow in the Laminar Flow interface, set the reference pressure level to 1 [atm], the reference temperature to 293.15 K, the turbulence model type to No turbulence model, and keep all other parameters as default values;

[0027] S4.1.2: The density and dynamic viscosity of the fluid properties in the Laminar Flow interface use the parameters set previously.

[0028] S4.1.3: The initial values ​​in the Laminar Flow interface remain unchanged and the coordinate system is selected as the global coordinate system;

[0029] S4.1.4: In the Laminar Flow interface, select the porous media domain surface and set the wall condition. Set the boundary condition of the wall to Slip and the display assumption equation to Transient.

[0030] S4.1.5: In the Laminar Flow interface, set the inlet boundary condition to Velocity, set the velocity to the normal inflow velocity, and add a step function to the velocity definition.

[0031] S4.1.6: In the Laminar Flow interface, set the Outlet Boundary Condition to Pressure with Pressure set to Static Pressure and Suppress Backflow checked.

[0032] S4.1.7: In the Laminar Flow interface, set the permeability model for the porous medium to Permeability, using the porosity and permeability definitions above.

[0033] S4.1.8: In the Laminar Flow interface, select a point at the outlet of the porous medium as a pressure point constraint.

[0034] S4.1.9: Set the mid-surface of the full model domain to the symmetry plane in the Laminar Flow interface.

[0035] Furthermore, setting the moisture transport interface in the air specifically includes:

[0036] S4.2.1: Select all domains as Moisture Transport in Air, set the Moist Air Mixture Type to Concentrated Species, and set all other parameters to their default values;

[0037] S4.2.2: Set the diffusion coefficient of moist air in the moisture transport interface in air;

[0038] S4.2.3: In the Moisture Transport in Air interface, set the initial value, select the air domain, and set the relative humidity value;

[0039] S4.2.4: In the Water Transport in Air interface, set Hygroscopic Porous Medium, select the Porous Medium domain, set the Water Transport Properties, set the Capillary Diffusion Model to Diffusion, and define the Water Diffusion Coefficient as Isotropic.

[0040] S4.2.5: In the Water Transport in Air interface, set the initial value, select the porous media domain, and set the relative humidity value.

[0041] S4.2.6: In the Moisture Transport in Air interface, set the inflow boundary condition, set the upstream properties, and define the upstream temperature and upstream relative humidity.

[0042] S4.2.7: Set the outflow boundary conditions in the Moisture Transport in Air interface to the default values;

[0043] S4.2.8: Set the full model domain mid-surface to the symmetry surface in the Moisture Transport in Air interface.

[0044] Furthermore, setting the humid air heat transfer interface specifically includes:

[0045] S4.3.1: Select Moist Air Heat Transfer for all domains, define the reference temperature as 293.15K, and use the default values ​​for other parameters;

[0046] S4.3.2: In the Moist Air Heat Transfer interface, select the Air domain setting as Moist Air and the Coordinate System setting as Global Coordinate System.

[0047] S4.3.3: In the Heat Transfer in Moist Air interface, set initial values, select all domains, and define initial values ​​for temperature.

[0048] S4.3.4: In the Moist Air Heat Transfer interface, select the porous medium domain, set the wet porous medium, and select the effective thermal conductivity of the plane layer parallel to the heat flow;

[0049] S4.3.5: In the Moist Air Heat Transfer interface, set the inflow boundary condition, set the upstream properties, and define the upstream temperature.

[0050] S4.3.6: In the Moist Air Heat Transfer interface, set the outflow boundary conditions to their default values.

[0051] S4.3.7: In the Heat Transfer in Moist Air interface, select the Porous Media domain, add a heat source, define it as a generalized source, and define its value as the adsorption heat formula.

[0052] S4.3.8: Set the mid-surface of the whole model domain as the symmetry surface in the Heat Transfer in Moist Air interface.

[0053] Furthermore, in the meshing of step S5, the unit size is first set to fluid dynamics calibration, a free triangle network is constructed on the inlet end face and the entire domain is swept; finally, the boundary layer is set and the size parameters are adjusted.

[0054] Furthermore, S6 specifically includes:

[0055] S6.1: Turn on the multiphysics option and enable the moisture flow, heat and moisture, and non-isothermal flow physics. This step allows the laminar flow, moisture transport in the air, and moist air heat transfer to be calculated together.

[0056] S6.2: Study Settings Tolerance is set to Physics Controlled;

[0057] Compared with the existing technology for measuring adsorption-related indicators of adsorbents, the scheme of the present invention only needs one experiment to verify its correctness, thus avoiding offline experimental testing and unnecessary material and cost losses. This method has the advantages of saving experimental costs, labor costs, etc., reducing experimental cycles, and obtaining accurate data of various internal adsorption processes of adsorbents.

[0058] The present invention provides a method for simulating the adsorption and heat release of activated carbon fiber adsorbent based on multi-physical field coupling. It has the following beneficial effects:

[0059] 1. Novelty: The present invention proposes a simulation method for adsorption and heat release of activated carbon fiber adsorbent based on multi-physical field coupling, which can integrate the interaction of multiple physical fields and accurately simulate the adsorption and heat release process of activated carbon fiber. This method combines factors such as temperature field, humidity field and fluid mechanics, overcoming the problem that a single physical field simulation method cannot explore the influence of multiple factors.

[0060] 2. Creativity: Compared with existing technologies, this method can innovatively couple the adsorption process of activated carbon fiber with the exothermic characteristics through multiple physical fields, so that the results obtained in the simulation process are more in line with the actual situation and the relevant parameters are more accurate. Its dynamic simulation process breaks through the limitations of traditional adsorption simulation methods that independently handle temperature fields, humidity fields and fluid mechanics. In addition, this simulation method can optimize the performance of adsorbents under different operating conditions, providing a scientific basis for the promotion of practical applications of adsorbents.

[0061] 3. Application prospects: This technology has broad application prospects, especially in the fields of energy conservation, environmental protection, air purification, etc. Through this method, the design of the adsorbent can be effectively optimized and the overall performance of the system can be improved. In addition, this method can be applied to the development and evaluation of other new adsorbent materials, providing certain theoretical and technical support for adsorption research. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] Figure 1 It is a schematic diagram of the mathematical model of the adsorbent of the present invention;

[0063] Figure 2 It is a three-dimensional model diagram of the adsorbent of the present invention;

[0064] Figure 3 A grid division diagram of the present invention;

[0065] Figure 4 This is the grid independent verification diagram of the present invention;

[0066] Figure 5 This is a comparison chart of the simulation and experimental results of the adsorbent inlet and outlet temperature and humidity under two working conditions of the present invention.

[0067] Figure 6It is a step function diagram of the present invention. DETAILED DESCRIPTION

[0068] The following specific examples are given to further clearly, completely and in detail illustrate the technical solution of the present invention. This example is the best example based on the technical solution of the present invention, but the protection scope of the present invention includes but is not limited to the following examples.

[0069] Example:

[0070] like Figure 1-Figure 6 As shown, in the solution provided in the embodiment of the present invention, the coupling elements such as laminar flow, moisture transport in the air, humid air heat transfer, and multi-physical field non-isothermal flow required for environmental heat and moisture transfer exchange are considered in the model, and specifically include the following steps:

[0071] S1: Establishing a three-dimensional model of adsorption heat release of an adsorbent: The adsorbent model used in this embodiment is a rectangular wave adsorbent adsorption model that has been made into a real object. The model includes a porous medium domain and an air domain. The air domain is in the porous medium domain and contacts with the inner wall of the porous medium domain.

[0072] S2: Material setting: Material setting is performed according to the thermodynamic parameters of the ACF-CA-1 / 1 adsorbent material used in actual conditions;

[0073] S3: Setting boundary conditions: using actual experimental parameters as boundary conditions of the model. In this embodiment, two boundary conditions (daytime environment adsorption and nighttime environment adsorption) are used.

[0074] S4: Perform multi-physics field settings, including fluid mechanics, thermodynamics, laminar flow, heat and moisture transfer in multi-physics fields, and non-isothermal moisture flow coupling;

[0075] S5: Set up mesh division and verify mesh independence;

[0076] S6: Perform solver settings. Set the separation solver to use tolerance as a parameter to control equation termination, which can ensure accurate model calculation results.

[0077] S7: Analyze the simulation results and verify the accuracy of the simulation results by comparing with the experimental results;

[0078] As a preferred solution of this embodiment, S1 is specifically:

[0079] S1.1: Simplify the physical adsorbent bed and analyze its mathematical model. The adsorbent mathematical model is as follows: Figure 1 As shown in Figure 1, a single flow channel was used as the research object, and a model was built in COMSOL Multiphysic at a 1:1 ratio according to the geometric shape. The middle of the adsorbent was set as the air domain. The three-dimensional model is shown in Figure 1. Figure 2 shown.

[0080] As a preferred solution of this embodiment, S2 is specifically:

[0081] The basic parameters required for the S2.1 model are: adsorbent specific heat capacity, adsorbent density, adsorbent thermal conductivity, adsorbent porosity, air density, water density, water molecular weight, etc. The specific parameters are shown in Table 1.

[0082] Table 1. Basic parameters of materials

[0083]

[0084] Among them, the setting of S3 boundary conditions includes: two wet air inlet conditions (20℃-80%RH, 23℃-70%RH) and ambient temperature;

[0085] As a preferred solution of this embodiment, S4 includes the following steps:

[0086] S4.1 Set up the laminar flow interface: After the Reynolds number calculation, the flow state in the air domain of the model is laminar. Among them, the Reynolds number is a dimensionless number used to characterize the flow state of the fluid, specifically referring to the ratio of the inertial force to the viscous force of the fluid flow. The calculation formula of the Reynolds number is: Re=(ρ*V*L) / μ

[0087] Where Re is the Reynolds number, ρ is the fluid density, V is the fluid velocity, L is the characteristic length, and μ is the fluid dynamic viscosity.

[0088] S4.1.1: In the Laminar Flow interface, set the air domain to laminar flow and enable the porous media domain. Select Incompressible flow in the Laminar Flow interface, and set the reference pressure level to 1 [atm], the reference temperature to 293.1 K, the turbulence model type to No turbulence model, and all other parameters are default values.

[0089] S4.1.2: In the Laminar Flow interface, select the Relative humidity mt option in the Model input for the fluid properties.

[0090] S4.1.3: The initial values ​​in the Laminar Flow interface remain unchanged and the coordinate system is selected as the global coordinate system.

[0091] S4.1.4: In the Laminar Flow interface, select the porous media domain surface and set the wall condition. Set the boundary condition of the wall to slip and set the displayed assumption equation to transient. This process makes the model more realistic and the model results more accurate. This setting is crucial for understanding and predicting the behavior of dynamic systems, especially in scenarios where time dependence needs to be considered.

[0092] S4.1.5: In the laminar flow interface, set the inlet boundary condition to velocity, set the velocity to the normal inflow velocity, and add a smooth step function to the velocity definition. Specifically, fill in u0*step(t[1 / s]) in the velocity box. This process can make the software process the velocity field more smoothly and make the model results more convergent.

[0093] S4.1.6: In the Laminar Flow interface, set the Outlet Boundary Condition to Pressure with Pressure set to Static Pressure and Suppress Backflow checked.

[0094] S4.1.7: In the Laminar Flow interface, set the permeability model for the porous medium to Permeability, using the porosity and permeability definitions above.

[0095] S4.1.8: In the Laminar Flow interface, select a point at the outlet of the porous medium as a pressure point constraint.

[0096] S4.1.9: Set the midsurface of the full model domain as the symmetry plane in the Laminar Flow interface.

[0097] S4.2 Set up the moisture transport interface in the air:

[0098] S4.2.1: Select all domains as Moisture Transport in Air, set the Moist Air Mixture Type to Concentrated Species, and set all other parameters to their default values.

[0099] S4.2.2: Set the diffusion coefficient for moist air in the Moisture in Air interface.

[0100] S4.2.3: In the Moisture Transport in Air interface, set the initial value, select the Air domain, and set the relative humidity value.

[0101] S4.2.4: In the Water Transport in Air interface, set up a hygroscopic porous medium, select the porous medium domain, set the water transport properties, set the capillary diffusion model to diffusion, and define the water diffusion coefficient as isotropic.

[0102] S4.2.5: In the Water Transport in Air interface, set the Initial Values, select the Porous Media domain, and set the Relative Humidity value.

[0103] S4.2.6: In the Moisture Transport in Air interface, set the Inflow boundary condition, set the Upstream Properties, and define the Upstream Temperature and Upstream Relative Humidity.

[0104] S4.2.7: Set the outflow boundary conditions in the Moisture Transport in Air interface to their default values.

[0105] S4.2.8: Set the midsurface of the full model domain as the symmetry plane in the Moisture Transport in Air interface.

[0106] S4.3 Set up the humid air heat transfer interface:

[0107] S4.3.1: Select Moist Air Heat Transfer for all domains, define the reference temperature as 293.15 K, and keep all other parameters as default values.

[0108] S4.3.2: In the Moist Air Heat Transfer interface, select the Air domain setting as Moist Air and the Coordinate System setting as Global Coordinate System.

[0109] S4.3.3: In the Heat Transfer in Moist Air interface, set Initial Values, select All Domains, and define the initial values ​​for Temperature.

[0110] S4.3.4: In the Moist Air Heat Transfer interface, select the porous medium domain, set the wet porous medium, and select the plane layer parallel to the heat flow as the effective thermal conductivity.

[0111] S4.3.5: In the Moist Air Heat Transfer interface, set the Inflow boundary condition, set the upstream properties, and define the upstream temperature.

[0112] S4.3.6: In the Heat Transfer in Moist Air interface, set the outflow boundary conditions to their default values.

[0113] S4.3.7: In the Heat Transfer in Moist Air interface, select the Porous Media domain, add a heat source, define it as a generalized source, and define its value as the adsorption heat formula.

[0114] S4.3.8: Set the midsurface of the entire model domain as the symmetry plane in the Heat Transfer in Moist Air interface.

[0115] As a preferred solution of this embodiment, S5 is specifically as follows: first, the unit size is set to fluid dynamics calibration, a free triangle network is constructed on the inlet end face and the entire domain is swept; finally, the boundary layer is set and the size parameters are adjusted. The specific mesh division shape is as follows Figure 3 shown.

[0116] As a preferred solution of this embodiment, S6 is specifically: add transient study 1, set the time unit to min, output the time step range (0, 1, 600), set the tolerance, enable the moisture flow, heat and moisture, and non-isothermal flow physical fields at the same time, set the three physical fields of heat and moisture, non-isothermal flow and moisture flow for solution, and click the transient study calculation button.

[0117] As a preferred solution of this embodiment, S7 is specifically:

[0118] S7.1: Conduct adsorption experiments on the adsorbent under two inlet conditions (20°C-80% RH, 23°C-70% RH) on the physical platform, and simultaneously measure the inlet and outlet temperatures and humidity of the humid air.

[0119] S7.2: Based on the model in COMSOL Multiphysic, change the air domain inlet temperature and humidity to be consistent with the experimental conditions, keep other options unchanged, and calculate the air domain outlet temperature and humidity data through transient study solution.

[0120] S7.3: Compare the experimental results with the simulation results. Since the experiment has certain limitations and the error is considered to be within an acceptable range through consulting relevant literature, the correctness of the model can be fully proved.

[0121] This multi-physics field coupling simulation method can not only effectively improve the efficiency of the adsorption process and ensure its operational stability under different operating conditions, but also reduce energy consumption and extend the service life of the adsorption material by adjusting the system operating parameters. Especially in terms of energy conservation, emission reduction and environmental protection, this method provides more possibilities and greater flexibility for engineering applications. With the continuous advancement of simulation technology, the application of this method in the future can not only optimize the design of the adsorption system in a laboratory environment, but also be promoted on a large scale in the industrial field, providing innovative solutions for energy conservation and environmental protection issues in multiple fields.

[0122] In addition, it is worth mentioning that the simulation system based on this method can also be combined with advanced control strategies to further improve the overall performance of the adsorption bed by real-time monitoring and adjusting the system operating parameters, and reduce the efficiency loss caused by factors such as changes in the external environment or aging of the adsorbent during operation. This simulation method provides strong support for the development of activated carbon fiber adsorption technology, especially in the context of the rapid development of high-efficiency energy-saving and environmental protection technologies, and has broad application prospects.

[0123] In the future, with the gradual improvement and promotion of multi-physics field coupling simulation technology, this method will not only be limited to activated carbon fiber adsorption systems, but can also be widely used in other types of adsorption systems or related energy-saving technologies, promoting innovation and progress in the entire adsorption field. Through further optimization of this simulation method, more targeted solutions can be provided for different industrial needs, promoting the widespread application of adsorption technology in multiple fields such as industry, environmental protection, and energy.

[0124] It is understandable to those skilled in the art that the above contents are only preferred embodiments of the invention and do not constitute a limitation of the invention. Although the specific examples of the method are described in detail herein, according to the experience of those skilled in the art, the above technical solutions can still be reasonably modified, or some of the technical features thereof can be equivalently replaced. These improvements, replacements and modifications within the spirit and principle of the invention should be included in the protection scope of the present invention.

[0125] Therefore, this patent is not limited to the above-mentioned optimal implementation. Anyone who, under the inspiration of this invention, derives other forms of adsorption simulation methods based on the principle of multi-physical field coupling, or makes equivalent improvements in other fields of adsorption technology, should be deemed to be within the scope of protection of this patent. Whether it is the improvement of activated carbon fiber adsorbents or the optimized design of other similar technologies, these changes and innovations based on the spirit of this invention will play an important role in future industrial applications.

Claims

1. A method for simulating adsorption and heat release of activated carbon fiber adsorbent based on multi-physical field coupling, characterized in that: COMSOL Multiphysics is used to simulate the adsorption and exothermic behavior of activated carbon fiber adsorbents in a multi-physics field, including the following steps: S1: A three-dimensional model of adsorption heat release of adsorbent is established based on COMSOL Multiphysic, which includes a simplified rectangular wave adsorbent model and an ambient air domain; Based on the interaction between the heat and mass transfer process of adsorbent adsorption and the air laminar flow, the capillary diffusion model is used to describe the water transport process in hygroscopic porous media. S2: Material setting: Material setting is performed according to the thermodynamic parameters related to the adsorbent material used in actual conditions; S3: Setting boundary conditions: including the inlet air velocity, temperature, relative humidity, and basic parameters and functions of the adsorbent adsorption heat formula; S4: Perform multi-physics field settings, including fluid mechanics, thermodynamics, laminar flow, heat and moisture transfer in multi-physics fields, and non-isothermal moisture flow coupling; S5: Set up mesh division and verify mesh independence; S6: Perform solver settings, set the separation solver to use tolerance as a parameter to control the termination of the equation, and perform transient calculations; S7: Analyze the simulation results and verify the accuracy of the simulation results by comparing them with experimental results.

2. The method for simulating adsorption and heat release of activated carbon fiber adsorbent based on multi-physical field coupling according to claim 1, characterized in that: S1 specifically includes: simplifying the model according to the actual adsorbent, and modeling the single flow channel of the actual adsorption bed in COMSOL Multiphysic as the research object; After simplifying the single-channel model, at least the adsorbent layer and the air domain inside the adsorbent are retained; An inlet is added to the air domain port on the wall in front of the adsorbent layer, and an outlet is added to the air domain port on the wall at the other end of the adsorbent layer to define the flow direction of the humid air.

3. The method for simulating adsorption and heat release of activated carbon fiber adsorbent based on multi-physical field coupling according to claim 1, characterized in that: The relevant material thermodynamic parameters in S2 include: thermal conductivity of porous media, specific heat capacity of porous media, density of porous media, pore radius, inlet capillary pressure, pore size distribution index, air density, air viscosity, liquid water density, liquid water viscosity and permeability.

4. The method for simulating adsorption and heat release of activated carbon fiber adsorbent based on multi-physical field coupling according to claim 1, characterized in that: The boundary condition setting and function setting in S3 specifically include: setting a step function, a fiber inlet boundary, a fiber outlet boundary and a porous medium integral, so that the model is easier to converge.

5. The method for simulating adsorption and heat release of activated carbon fiber adsorbent based on multi-physical field coupling according to claim 1, characterized in that: S4 includes the following steps: S4.1: Set up the laminar flow interface; S4.2: Set up an interface for transferring moisture from the air; S4.3: Set up the humid air heat transfer interface; S4.4: Set up multiphysics: Add multiphysics - moisture flow, select all domains, and set the coupling interface to laminar flow and moisture transport in air; heat and moisture, select all domains, and set the coupling interface to heat transfer in humid air and moisture transport in air; non-isothermal flow, select all domains, and set the coupling interface to heat transfer in humid air and moisture transport in air.

6. The method for simulating adsorption and heat release of activated carbon fiber adsorbent based on multi-physical field coupling according to claim 1, characterized in that: The grid division in S5 includes: S5.1: Set the cell size to hydrodynamic calibration; S5.2: Construct a free triangle network on the inlet end face and sweep the entire domain; S5.3: Set the boundary layer and adjust the size parameters.

7. The method for simulating adsorption and heat release of activated carbon fiber adsorbent based on multi-physical field coupling according to claim 1, characterized in that: The S6 specifically includes: S6.1: Calculate laminar flow, moisture transport in air, and moist air heat transfer together; S6.2: Study Setup Tolerances are set to Physics Controlled.

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