Structure of fog-type photoreactor and parameter calculation method of fog-type photoreactor

Abstract

The invention discloses a fog-type photoreactor structure and a parameter calculation method thereof, the fog-type photoreactor parameter calculation method is an efficient optimization technology, firstly, the space distribution of fog particles generated by an atomizer is described through a mathematical function f (x), and the average fog particle diameter is determined; then, the illumination penetration depth epsilon is calculated by utilizing an illumination penetration intensity attenuation formula and combining parameters such as the fog particle diameter, the light intensity and the wavelength; meanwhile, according to the atomization amount and the reaction rate, the retention time of reactants is estimated. And evaluating the circulation distance d of the fog particles in the reactor by combining the atomization speed, the retention time and the correction coefficient. The series of accurate calculation not only reveals the interaction rule of light, fog particles and reactants in the reactor, but also provides a scientific basis for the structural design of the reactor. The application of the method aims at improving the performance of the reactor, reducing the energy consumption and the cost and promoting the innovation and development of a photochemical reaction technology.

Description

Technical Field

[0001] The invention discloses a structure of a mist-type photoreactor and a method for calculating its parameters. Background Art

[0002] A mist photoreactor usually refers to a specially designed photocatalytic reactor, which uses spray technology to form reactants into tiny droplets, thereby increasing the contact area between the reactants and the photocatalyst and light source, thereby improving the efficiency of the photocatalytic reaction.

[0003] The design of the mist photoreactor is difficult to design according to the traditional photoreactor method due to its special characteristics of high dispersion and multiple interfaces, and its characteristic parameters are obviously inconsistent with those of conventional reactors; the mist photoreactor involves information such as atomization volume, mist particle distribution, reaction rate, light penetration distribution, mist particle circulation characteristics, etc. The above parameters have a great influence on the design of the reactor, but the calculation method of the maximum light penetration depth and mist particle circulation distance in the existing technology is not accurate enough. Summary of the invention

[0004] The purpose of the present invention is to solve the above deficiencies in the prior art and to provide a structure of a mist photoreactor and a method for calculating its parameters.

[0005] A method for calculating parameters of a mist-type photoreactor comprises the following steps:

[0006] S1: Understand the distribution of the mist particles generated by the atomizer in space and express it in the form of function f(x);

[0007] S2: Based on the distribution of fog particles, the average fog particle diameter is obtained;

[0008] S3: According to the light penetration intensity attenuation formula Es = a*E0*ε(-b), combined with the average fog particle diameter and the constants a and b related to the light intensity Q and wavelength λ, the light penetration depth ε under a specific light energy attenuation ratio is calculated;

[0009] S4: Calculate the residence time t of the reactant in the reactor according to the atomization amount q and the reaction rate v1, that is, t = q / v1;

[0010] S5: Combine the atomizer mist velocity v2 and the reaction residence time t, as well as the correction coefficient μ, to estimate the circulation distance of the mist particles in the reactor: d = v2*t*μ;

[0011] S6: Based on the above calculation results, the reactor is structurally designed.

[0012] Among them, in step S2, the average particle diameter is obtained by screening method, spray method, laser emission, sedimentation method, dynamic scattering method, electron microscope imaging method, particle counter, foam meter and the like.

[0013] After calculating the relevant parameters, the mist photoreactor can be designed. In this patent, a structure of a mist photoreactor is designed, which includes:

[0014] Transparent reaction vessel: used to contain reactants and photocatalysts and allow light to penetrate to stimulate photocatalytic reactions;

[0015] Light source: provides the light required for the reaction;

[0016] Atomizer: Atomizes the reactants into tiny droplets;

[0017] Reactor: used to contain reactants and maintain the reaction environment;

[0018] Baffles: used to separate different areas within the reactor or to guide fluid flow;

[0019] Gas inlet: Appropriate reaction gas position and flow rate can increase the flow velocity of the fluid in the reactor, thereby increasing the circulation distance of the mist particles;

[0020] Mirror radiation plate: used to reflect light, enhance the utilization rate and penetration depth of light.

[0021] Furthermore, the light source includes lamp beads, a liquid cooling outlet, a liquid cooling inlet, and a power supply port. The liquid cooling inlet is used for the cooling liquid to enter, the liquid cooling outlet is used for the cooling liquid to be discharged, the power supply port is used to connect to the power supply equipment, and the lamp beads are used to provide lighting.

[0022] Furthermore, the reactor includes a kettle body and a cooling cavity. An upper cover is provided on the kettle body. The kettle body is installed in a transparent reaction container through a flange. The upper cover is connected to the kettle body through bolts and flanges to form a closed reaction space. The reaction space is provided with a sampling port for taking out samples for testing. The cooling cavity is connected to the kettle body, and a coolant inlet and a coolant outlet are provided on the cooling cavity.

[0023] Furthermore, the material of the reactor is one of glass, metal and plastic, and the material used for the light-transmitting area of ​​the reactor is a transparent material.

[0024] Furthermore, the atomizer is one of a cold evaporation atomizer, a hot evaporation atomizer, an ultrasonic atomizer, and a compressed air atomizer.

[0025] Furthermore, the light source is one or more of cylindrical, plate, and belt types.

[0026] Beneficial effects: Compared with the prior art, the present invention has the following advantages:

[0027] 1. Strong scientificity and accuracy:

[0028] The calculation of the maximum penetration depth of illumination is based on the light intensity attenuation formula (such as Es = aE0ε^(-b)). This formula takes into account multiple factors such as light intensity, wavelength, and fog particle diameter, and can more accurately reflect the attenuation of light in fog particles.

[0029] The calculation of the mist particle circulation distance combines the atomizer mist outlet speed, reaction residence time and correction factor. These parameters are based on actual physical processes and experimental data, ensuring the scientificity and accuracy of the calculation results.

[0030] 2. High flexibility:

[0031] The calculation method takes into account different light source configurations and reflection conditions (such as light sources on both sides, light source on one side and mirror aluminum on the other side, etc.), so that the calculation results can be applied to a variety of reactor design scenarios.

[0032] The introduction of the correction coefficient (μ) enables the calculation process to take into account the influence of environmental factors (such as gravity, magnetic field, air flow inlet, etc.), which increases the flexibility and applicability of the calculation method.

[0033] 3. Guidance:

[0034] By calculating the maximum penetration depth of light, a basis can be provided for the selection and arrangement of the light source of the reactor, ensuring that the light source can fully penetrate the fog layer and achieve the expected reaction effect.

[0035] The calculation results of the mist particle circulation distance help determine the size and structural layout of the reactor to ensure that the mist particles can circulate and react fully in the reactor.

[0036] 4. Optimize reactor design:

[0037] Based on the calculation results, the various components of the reactor can be optimized, such as adjusting the power and distribution of the light source, improving the performance of the atomizer, optimizing the flow channel structure of the reactor, etc., to improve the overall performance and efficiency of the reactor.

[0038] 5. Convenience of experimental verification:

[0039] The calculation results can be used as a reference for experimental design, helping researchers to quickly determine experimental conditions and parameter ranges, and reduce the number and cost of experimental trial and error.

[0040] At the same time, the experimental results can also verify the accuracy and reliability of the calculation method in turn, and provide feedback for the improvement and optimization of the calculation method.

[0041] 6. Promote technological innovation:

[0042] This calculation method based on physical models and experimental data has promoted the innovation and development of spray micro-droplet reactor technology. By continuously optimizing the calculation method and reactor design, the application and promotion of this technology in more fields can be promoted. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 is a schematic diagram of Embodiment 3;

[0044] Figure 2 is a schematic diagram of Embodiment 4;

[0045] Figure 3 is a schematic diagram of Embodiment 5;

[0046] Figure 4 is a schematic diagram of Embodiment 6;

[0047] In the figure, 1. transparent reaction container, 2. light source, 3. reactor, 4. atomizer, 5. partition, 6. lamp beads, 7. liquid cooling inlet, 8. liquid cooling outlet, and 9. air flow inlet. DETAILED DESCRIPTION

[0048] In order to deepen the understanding of the present invention, the present invention will be further described in detail below in conjunction with embodiments and drawings. The embodiments are only used to explain the present invention and do not constitute a limitation on the protection scope of the present invention.

[0049] like Figure 1-4 As shown, a transparent reaction container 1, a light source 2, a reactor 3, an atomizer 4, a baffle 5, a lamp bead 6, a liquid cooling inlet 7, a liquid cooling outlet 8, and an air flow inlet 9;

[0050] Example 1: Calculation method

[0051] A method for calculating the parameters of a mist photoreactor 3:

[0052] First, the distribution of the mist particles generated by the atomizer 4 in three-dimensional space was deeply explored and quantified in the form of a mathematical function f(x). This step not only intuitively shows the dispersion pattern of the mist particles, but also provides a solid mathematical support for subsequent calculations.

[0053] Subsequently, the average diameter of the mist particles was accurately determined using advanced spray laser particle size analyzer technology. This key parameter plays a vital role in understanding the interaction mechanism between light and mist particles and evaluating the light penetration ability.

[0054] Based on the core parameters such as average fog particle diameter, light intensity, wavelength, etc., by applying the light penetration intensity attenuation formula Es = aE0ε(-b), the light penetration depth ε under a specific light energy attenuation ratio is scientifically calculated. This calculation result provides a scientific basis for the optimization of the layout of the light source 2 and the internal structure design of the reactor 3.

[0055] At the same time, considering the influence of the residence time of the reactants in the reactor 3 on the reaction efficiency, the calculation formula of the residence time t = q / v1 is derived by combining the atomization amount q and the reaction rate v1. The determination of this time parameter is of great significance for optimizing the reaction conditions and improving the reaction efficiency.

[0056] In order to further improve the circulation effect of the mist particles in the reactor 3, the mist outlet speed v2 of the atomizer 4, the reaction residence time t and the correction coefficient μ are combined to reasonably estimate the circulation distance d=v2tμ of the mist particles. This estimation result not only reveals the movement law of the mist particles in the reactor 3, but also provides an important reference for the selection and layout of the air flow inlet 9.

[0057] Example 2: Reactor 3 Structure

[0058] Based on the parameter calculation, the specific structure of the mist photoreactor 3 is carefully designed. The structure integrates multiple key components such as a transparent reaction container 1, an efficient light source 2, a precision atomizer 4, a stable reactor 3, a partition 5, an enhanced airflow inlet 9, and a mirror reflector. The transparent reaction container 1 provides sufficient reaction space for reactants and photocatalysts, ensuring the free penetration and distribution of light; the efficient light source 2 emits high-intensity light through the built-in lamp beads 6, providing sufficient light energy for the reaction; the precision atomizer 4 finely atomizes the reactants into tiny droplets, increasing the contact area between the reactants and the light; the stable reactor 3 maintains the stability and safety of the reaction environment; the partition 5 is used to optimize the fluid flow in the reactor 3; the enhanced airflow inlet 9 enhances the circulation effect of the mist particles by increasing the fluid flow rate; the mirror reflector uses the principle of light reflection to further improve the utilization rate and penetration depth of light.

[0059] In the design of the light source 2, special attention is paid to the optimization of the cooling and power supply systems. The careful arrangement of the liquid cooling inlet 7 and the liquid cooling outlet 8 ensures the stability and reliability of the light source 2 during long-term operation; and the reasonable design of the power supply port realizes the convenient connection and stable power supply of the light source 2 and the power supply equipment.

[0060] In the selection of the material of the reactor 3, factors such as light transmittance, corrosion resistance and structural strength were fully considered. The material finally selected not only has excellent light transmittance, which can ensure the free penetration and distribution of light in the reactor 3, but also has good corrosion resistance and structural strength, which can maintain a stable operating state in harsh working environments.

[0061] Embodiment three:

[0062] On the basis of the first and second embodiments, when both sides of the transparent reactor 3 are light sources 2, the penetration depth ε=ε1. In this case, light sources 2 are arranged on both sides of the reactor 3, and light is irradiated to the reactants from both sides at the same time. The penetration depth ε refers to the ability of light to penetrate the reactants or reaction medium to a certain depth. Since the light is irradiated from both sides at the same time and there is no additional reflection or focusing effect, the penetration depth can be simply expressed as ε1, where ε1 is a basic or standard penetration depth value, which depends on the intensity and wavelength of the light source 2 and the optical properties of the reactants.

[0063] Embodiment 4:

[0064] On the basis of the first and second embodiments, when one side is the light source 2 and the other side is mirror aluminum, the penetration depth ε=4ε1:

[0065] In this configuration, one side of the reactor 3 is the light source 2, and the other side is mirror aluminum. Mirror aluminum has an extremely high reflectivity and can reflect light back almost without loss. Therefore, when the light is irradiated from the light source 2 side to the reactant, part of the light will penetrate the reactant and be absorbed, while the other part of the light will be reflected back by the mirror aluminum and pass through the reactant again. Due to this multiple reflection effect, the actual penetration depth of the light in the reactant will increase significantly. Theoretically, if the reflectivity of the mirror aluminum is 100% and other losses (such as scattering, absorption, etc.) are not considered, the penetration depth can be increased to 4 times the original value (because the light will penetrate at least twice: once from the light source 2 to the reactant, and the other time it is reflected back from the mirror aluminum and then penetrates the reactant), but in practice this multiple may be reduced due to various factors.

[0066] Embodiment five:

[0067] On the basis of embodiments 1 and 2, when the reactor 3 is surrounded by light sources 2, what is described here is a configuration of light sources 2 in a three-dimensional space, in which the entire reaction area is covered by the light sources 2. The circulation distance d generally refers to the length of the path along which the reactants or reaction medium flows or circulates in the reactor 3. In this case, since the light source 2 covers the entire area, the reactants can be irradiated by light at any position in the reactor 3. Therefore, the circulation distance d is simply equal to the sum of the lengths of the various flow paths in the reactor 3, i.e., a1+a2+a3, where a1, a2, and a3 represent the lengths of different flow paths or regions, respectively.

[0068] Embodiment six:

[0069] On the basis of the first and second embodiments, when a shield is provided between the reactor 3 and the light source 2, in this case, the light source 2 only covers a part of the reactor 3. Due to the uneven distribution of the light source 2, the light intensity received by the reactants at different positions in the reactor 3 will also be different. The specific value of the circulation distance d will depend on the coverage of the light source 2 and the flow path of the reactants, as shown in the figure.

[0070] In summary, the design of the mist photoreactor 3 not only relies on a scientific and reasonable parameter calculation method, but also integrates the advantages of compact structure, complete functions, stable operation, etc. This innovative design will bring significant promotion and improvement to the research and application fields of photocatalytic reactions.

[0071] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for calculating parameters of a mist photoreactor, characterized in that: The following steps are involved: S1: Understand the distribution of the mist particles generated by the atomizer in space and express it in the form of function f(x); S2: Based on the distribution of fog particles, the average fog particle diameter is obtained; S3: According to the light penetration intensity attenuation formula E s =a*E0*ε (-b) , combining the average fog particle diameter and the constants a and b related to the light intensity Q and wavelength λ, the light penetration depth ε at a specific light energy attenuation ratio is calculated; S4: Calculate the residence time t of the reactant in the reactor according to the atomization amount q and the reaction rate v1, that is, t = q / v1; S5: Combine the atomizer mist velocity v2 and the reaction residence time t, as well as the correction coefficient μ, to estimate the circulation distance of the mist particles in the reactor: d = v2*t*μ; S6: Based on the above calculation results, the reactor is structurally designed.

2. The parameter calculation method of a mist photoreactor according to claim 1, characterized in that: In step S2, the average particle diameter is obtained by one or more of the following methods: screening method, spray method, laser emission, sedimentation method, dynamic scattering method, electron microscope imaging method, particle counter, and foam meter.

3. A structure of a mist photoreactor, characterized in that: include: Transparent reaction vessel: used to contain reactants and photocatalysts and allow light to penetrate to stimulate photocatalytic reactions; Light source: provides the light required for the reaction; Atomizer: atomizes the reactants into tiny droplets; Reactor: used to contain reactants and maintain the reaction environment; Baffles: used to separate different areas within the reactor or to guide fluid flow; Gas inlet: Appropriate reaction gas position and flow rate can increase the flow velocity of the fluid in the reactor, thereby increasing the circulation distance of the mist particles; Mirror radiation plate: used to reflect light, enhance the utilization rate and penetration depth of light.

4. The structure of a mist-type photoreactor according to claim 3, characterized in that: The light source includes lamp beads, a liquid cooling outlet, a liquid cooling inlet, and a power supply port. The liquid cooling inlet is used for cooling liquid to enter, the liquid cooling outlet is used for cooling liquid to be discharged, the power supply port is used to connect to a power supply device, and the lamp beads are used to provide lighting.

5. The structure of a mist-type photoreactor according to claim 3, characterized in that: The reactor comprises a kettle body and a cooling cavity. An upper cover is provided above the kettle body. The kettle body is installed in a transparent reaction container through a flange. The upper cover is connected to the kettle body through bolts and flanges to form a closed reaction space. The reaction space is provided with a sampling port for taking out samples for testing. The cooling cavity is connected to the kettle body. A coolant inlet and a coolant outlet are provided on the cooling cavity.

6. The structure of a mist-type photoreactor according to claim 5, characterized in that: The material of the reactor is one of glass, metal and plastic, and the material used for the light-transmitting area of ​​the reactor is a transparent material.

7. The structure of a mist-type photoreactor according to claim 3, characterized in that: The atomizer is one of a cold evaporation atomizer, a hot evaporation atomizer, an ultrasonic atomizer, and a compressed air atomizer.

8. The structure of a mist-type photoreactor according to claim 3, characterized in that: The light source is one or more of cylindrical, plate and belt types.

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