Design method of trickle bed reactor

Abstract

The embodiment of the invention discloses a trickle bed reactor design method. The method comprises the following steps: determining the geometric dimension of a trickle bed reactor to be designed, and establishing a two-dimensional geometric model of the trickle bed reactor according to the geometric dimension; obtaining related substance parameters of the trickle bed reactor, and determining an inlet condition according to the geometric dimension and the related substance parameters; performing two-dimensional computational fluid mechanics simulation according to the two-dimensional geometric model and the inlet condition to obtain a first simulation result; and under the condition that the first simulation result meets a preset first design requirement, determining a target design scheme of the trickle bed reactor according to the geometric dimension. According to the technical scheme provided by the embodiment of the invention, the accuracy of the design scheme of the trickle bed reactor is improved.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of fixed bed reactors, and in particular to a trickle bed reactor design method. Background Art

[0002] Since the trickle bed reactor has the advantages of simple structure, convenient operation, great operational flexibility and low construction investment, it is widely used in the fields of catalytic hydrocracking and refining of various oil products and selective hydrorefining of low-carbon hydrocarbons.

[0003] At present, the design of trickle bed reactors is mainly based on test results and technical requirements. However, the accuracy of the design scheme of trickle bed reactors designed in this way is not high, which needs to be solved urgently. Summary of the invention

[0004] The embodiment of the present invention provides a trickle bed reactor design method, which improves the accuracy of the design scheme of the trickle bed reactor.

[0005] According to one aspect of the present invention, a trickle bed reactor design method is provided, which may include: determining the geometric dimensions of the trickle bed reactor to be designed, and establishing a two-dimensional geometric model of the trickle bed reactor based on the geometric dimensions; obtaining the associated material parameters of the trickle bed reactor, and determining the inlet conditions based on the geometric dimensions and the associated material parameters; performing a two-dimensional computational fluid dynamics simulation based on the two-dimensional geometric model and the inlet conditions to obtain a first simulation result; and determining a target design scheme for the trickle bed reactor based on the geometric dimensions when the first simulation result meets a preset first design requirement.

[0006] The technical solution of the embodiment of the present invention is to determine the geometric dimensions of the trickle bed reactor to be designed, and establish a two-dimensional geometric model of the trickle bed reactor according to the geometric dimensions, so as to establish the two-dimensional geometric model of the trickle bed reactor; to obtain the associated material parameters of the trickle bed reactor, and determine the inlet conditions according to the geometric dimensions and the associated material parameters, so as to determine the inlet conditions required for two-dimensional computational fluid dynamics simulation; to perform two-dimensional computational fluid dynamics simulation according to the two-dimensional geometric model and the inlet conditions, and obtain the first simulation result, so as to simulate the flow in the two-dimensional geometric model; to determine the target design scheme of the trickle bed reactor according to the geometric dimensions when the first simulation result meets the preset first design requirement, so as to determine the accurate target design scheme. The above technical solution obtains the first simulation result of the evaluation result of the trickle bed reactor corresponding to the geometric dimensions by performing two-dimensional computational fluid dynamics simulation on the established two-dimensional geometric model, and determines the target design scheme of the trickle bed reactor according to the geometric dimensions when the first simulation result meets the preset first design requirement, so that the target design scheme can meet the design requirements, thereby improving the accuracy of the design scheme of the trickle bed reactor.

[0007] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0009] Figure 1 is a flow chart of a trickle bed reactor design method provided according to an embodiment of the present invention;

[0010] Figure 2 It is a schematic diagram of the main components and geometric variables of a two-dimensional geometric model in a trickle bed reactor design method provided according to an embodiment of the present invention;

[0011] Figure 3 It is a schematic diagram of a two-dimensional calculation domain and boundary conditions of a two-dimensional geometric model in a trickle bed reactor design method provided according to an embodiment of the present invention;

[0012] Figure 4 is a flow chart of another trickle bed reactor design method provided according to an embodiment of the present invention;

[0013] Figure 5 is a schematic diagram of the main components of a three-dimensional geometric model in another trickle bed reactor design method provided according to an embodiment of the present invention;

[0014] Figure 6 is a schematic diagram of geometric variables of a three-dimensional geometric model in another trickle bed reactor design method provided according to an embodiment of the present invention;

[0015] Figure 7 is a schematic diagram of a top view of a three-dimensional geometric model in another trickle bed reactor design method provided according to an embodiment of the present invention;

[0016] Figure 8 is a flow chart of an optional example of another trickle bed reactor design method provided according to an embodiment of the present invention;

[0017] Fig. 9 is a schematic diagram of temperature distribution in yet another optional example of another trickle bed reactor design method provided by an embodiment of the present invention;

[0018] Fig.10 is a schematic diagram of pressure distribution in another optional example of another trickle bed reactor design method provided by an embodiment of the present invention;

[0019] Fig.11 is a schematic diagram of another temperature in another optional example of another trickle bed reactor design method provided according to an embodiment of the present invention;

[0020] Fig.12 is a schematic diagram of component molar concentration distribution in another optional example of another trickle bed reactor design method provided according to an embodiment of the present invention;

[0021] Fig.13 is a schematic diagram of a bed structure of a three-dimensional geometric model in yet another optional example in another trickle bed reactor design method provided by an embodiment of the present invention;

[0022] Fig.14 is a schematic diagram of inlet geometric structure details of a three-dimensional geometric model in yet another optional example of another trickle bed reactor design method provided according to an embodiment of the present invention;

[0023] Fig.15 is a schematic diagram of a second grid division strategy according to another optional example of another trickle bed reactor design method provided by an embodiment of the present invention;

[0024] Fig.16 is a schematic diagram of a first setting result according to another optional example of another trickle bed reactor design method provided by an embodiment of the present invention;

[0025] Fig.17 is a schematic diagram of the cavity height in another optional example of another trickle bed reactor design method provided by an embodiment of the present invention;

[0026] Fig.18 is a schematic diagram of the height of the first layer of inert filler in yet another optional example of another trickle bed reactor design method provided according to an embodiment of the present invention;

[0027] Fig.19 is a schematic diagram of the height of the second layer of inert filler in yet another optional example of another trickle bed reactor design method provided according to an embodiment of the present invention;

[0028] Fig. 20 is a schematic diagram of a premixing inlet diameter according to another optional example of another trickle bed reactor design method provided by an embodiment of the present invention;

[0029] Fig.21 is a schematic diagram of the inner diameter of the central cylinder of the gas-liquid distributor on the disc plate in another optional example of another trickle bed reactor design method provided by an embodiment of the present invention;

[0030] Fig. 22 is a schematic diagram of the spacing of openings in the central tube of a gas-liquid distributor on a plate in yet another optional example of another trickle bed reactor design method provided in an embodiment of the present invention;

[0031] Fig.23 is a structural block diagram of a trickle bed reactor design device provided according to an embodiment of the present invention;

[0032] Fig.24 It is a schematic diagram of the structure of an electronic device for implementing the trickle bed reactor design method according to an embodiment of the present invention. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme 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 only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0034] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. The situations of "target", "original", etc. are similar and will not be repeated here. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0035] Before introducing the embodiments of the present invention, an exemplary explanation is given of the implementation process of the current trickle bed reactor design and the reasons why the accuracy of the designed trickle bed reactor design is not high, so as to better understand why the scheme proposed in the embodiments of the present invention improves the accuracy of the trickle bed reactor design.

[0036] Exemplarily, the design of the trickle bed reactor mainly determines the parameters of the associated substances based on the test results and technical requirements, and calculates and designs the size and height-to-diameter ratio of the trickle bed reactor, the catalyst bed and the gas-liquid distributor based on the engineering calculation of the empirical parameters and formulas in the design manual and relevant specifications. The accuracy of the engineering design of the trickle bed reactor relies heavily on empirical parameters and formulas, which are summarized based on a large number of engineering practices and have the advantages of simple and convenient calculation process. However, if there is no strong basis for the selection of certain parameters, or the formula is not applicable to some gas-liquid-solid three-phase systems with unique characteristics such as high viscosity, high gas-liquid ratio and contaminated particles, the output, conversion rate, pressure drop and temperature required by the trickle bed reactor design cannot be guaranteed. In addition, the design of the trickle bed reactor by experimental method is limited by the geometric dimensions of the experimental device and the gas-liquid content measurement instrument. The experimental study can only obtain laboratory-specific, local, instantaneous temperature, components and gas-liquid distribution, and the data errors of each cross section are large. For the multivariable design process, the operating cost and time cost of the experiment are relatively high, and the design cycle is long and the cost is high. Therefore, the above method cannot obtain the fluid mechanics effects such as gas-liquid distribution in the bed of the trickle bed reactor. Therefore, the flow and gas-liquid distribution inside the packed bed reactor are less considered during the design, resulting in low accuracy of the design scheme of the trickle bed reactor.

[0037] In view of this, the embodiment of the present invention obtains a first simulation result of the evaluation result of the trickle bed reactor corresponding to the geometric dimensions by performing a two-dimensional computational fluid dynamics simulation on the established two-dimensional geometric model. When the first simulation result meets the preset first design requirement, the target design scheme of the trickle bed reactor is determined according to the geometric dimensions, so that the target design scheme can meet the design requirements, thereby improving the accuracy of the design scheme of the trickle bed reactor. This will be explained in detail below.

[0038] Figure 1 It is a flow chart of a trickle bed reactor design method provided in an embodiment of the present invention. This embodiment is applicable to the design of a trickle bed reactor, especially to the design of a large industrial trickle bed reactor. The method can be executed by a trickle bed reactor design device provided in an embodiment of the present invention, and the device can be implemented by software and / or hardware, and the device can be integrated on an electronic device, and the electronic device can be various user terminals or servers.

[0039] See also Figure 1 The method of the embodiment of the present invention specifically includes the following steps:

[0040] S110, determining the geometric dimensions of the trickle bed reactor to be designed, and establishing a two-dimensional geometric model of the trickle bed reactor based on the geometric dimensions.

[0041] The geometrical dimensions are the dimensions of the trickle bed reactor in geometric dimensions; the geometrical dimensions may include, for example, at least one of the main dimensions of the bed layer of the trickle bed reactor, such as the diameter and height. The two-dimensional geometrical model is a two-dimensional geometrical model of the trickle bed reactor.

[0042] In the embodiment of the present invention, for example, a preset geometric dimension may be obtained; for another example, the geometric dimension may be obtained by design calculation from an engineering perspective; for another example, the geometric dimension may be determined according to the associated material parameters; for another example, the geometric dimension may be determined according to the test results and / or technical requirements of the trickle bed reactor; etc. In the embodiment of the present invention, the method for determining the geometric dimension of the trickle bed reactor to be designed is not specifically limited.

[0043] For example, the liquid density ρ can be obtained liq,in (kg / m 3 ) and the liquid phase molar mass M liq , where liquid density and liquid phase molar mass can belong to the parameters of the same liquid, and the subsequent parameters related to the liquid or liquid phase can all belong to the parameters of the liquid. liq,in and the liquid phase molar mass M liq , through the formula C liq,in =ρ liq,in / M liq×1000, determine the reactant inlet molar concentration C liq,in (mol / m 3 );Get liquid mass space velocity LHSV(h -1 ), according to the reactant inlet molar concentration C liq,in and liquid mass space velocity LHSV, through the formula m cata =C liq,in / LHSV, determine the catalyst mass m cata ; Obtain the bulk density ρ of the catalyst particles in the trickle bed reactor bed (kg / m 3 ), according to the catalyst mass m cata and bulk density ρ bed , through the formula V cata =m cata / ρ bed , determine the catalyst volume V cata (m 3 );Get the preset height-to-diameter ratio of the trickle bed reactor According to the aspect ratio and catalyst volume V cata , through the formula as well as Determine the height H and diameter D of the bed layer in the trickle bed reactor, where Ratio HR The ratio of the height to the radius of the trickle bed reactor can be determined based on the height-to-diameter ratio.

[0044] For example, a two-dimensional geometric model can be established using SolidWorks software according to the height and diameter in the geometric dimensions. In the embodiment of the present invention, there is no specific limitation on the method of establishing the two-dimensional geometric model of the trickle bed reactor according to the geometric dimensions.

[0045] S120, obtaining the associated material parameters of the trickle bed reactor, and determining the inlet conditions according to the geometric dimensions and the associated material parameters.

[0046] Among them, the associated material parameters are parameters related to the materials related to the trickle bed reactor; the associated material parameters may include, for example, at least one of liquid density, liquid phase molar mass, liquid mass space velocity, bulk density, aspect ratio, proportion of reactants in liquid phase mass, reactant molar mass, inlet gas density, and gas phase molar mass, etc. The inlet condition is an important boundary condition that defines the physical state of the fluid when it enters the calculation domain of the two-dimensional geometric model; the inlet condition may include, for example, at least one of inlet liquid phase reactant molar flow rate, liquid phase reactant inlet molar concentration, gas phase reactant inlet molar concentration, inlet gas-liquid volume ratio, bed inlet velocity, bed gas inlet flow rate, and bed gas inlet velocity, etc.

[0047] It can be understood that in a trickle bed reactor, gas and liquid are the main carriers of material and energy transfer. The geometric structure, internal components and inlet conditions of the trickle bed reactor affect the gas-liquid mixing process in the trickle bed reactor, and restrict the distribution effects of bed temperature, composition and pressure drop. By reasonably constructing a mathematical model, the flow field, composition, temperature, pressure drop and gas-liquid distribution of the bed of the trickle bed reactor can be accurately and efficiently obtained by using a computational fluid dynamics simulation method. Therefore, the embodiment of the present invention can combine the associated material parameters obtained based on empirical engineering calculations with the computational fluid dynamics (CFD) method, from the bed temperature, composition and pressure drop of a two-dimensional trickle bed reactor to the three-dimensional gas-liquid distribution optimization of the entire trickle bed reactor including the premix inlet diameter, the inner diameter of the gas-liquid distributor, the inert bed and the catalyst bed grading, and analyzes the design scheme of the trickle bed reactor, providing a new approach and method for guiding the design of a trickle bed reactor.

[0048] In the embodiment of the present invention, there is no specific limitation on the method of determining the inlet condition according to the geometric dimensions and the associated material parameters.

[0049] S130, performing a two-dimensional computational fluid dynamics simulation according to the two-dimensional geometric model and the inlet conditions to obtain a first simulation result.

[0050] Among them, computational fluid dynamics (CFD) is a technology that uses numerical analysis and data structures to solve problems involving fluid flow; two-dimensional computational fluid dynamics simulation is to use computational fluid dynamics to simulate the fluid flow of a two-dimensional geometric model. The first simulation result is the result of a two-dimensional computational fluid dynamics simulation based on the two-dimensional geometric model and the inlet conditions; in the embodiment of the present invention, the content of the first simulation result may correspond to the simulation type of the two-dimensional computational fluid dynamics simulation, and in the embodiment of the present invention, the content of the first simulation result is not specifically limited.

[0051] In the embodiment of the present invention, for example, a two-dimensional computational fluid dynamics simulation can be performed according to the two-dimensional geometric model and the inlet conditions to calculate the bed height temperature, components, pressure drop and gas-liquid content distribution to obtain a first simulation result; for another example, a two-dimensional computational fluid dynamics simulation can be performed according to the two-dimensional geometric model and the inlet conditions to convert the reactant conversion rate, the bed inlet and outlet temperature difference and pressure drop based on the two-dimensional trickle bed reactor bed outlet components to obtain a first simulation result; etc. In the embodiment of the present invention, the manner of performing a two-dimensional computational fluid dynamics simulation according to the two-dimensional geometric model and the inlet conditions to obtain the first simulation result is not specifically limited.

[0052] Optionally, the two-dimensional computational fluid dynamics simulation includes at least one of the numerical simulation of the two-phase flow of the bed, the numerical simulation of the heat transfer of the bed, and the numerical simulation of the reaction of the bed. Accordingly, the first simulation result may include the numerical simulation result of the two-phase flow of the bed, the numerical simulation result of the heat transfer of the bed, and the numerical simulation result of the reaction of the bed. Among them, the numerical simulation of the two-phase flow of the bed mainly studies the flow characteristics of two different phases of gas-liquid, gas-solid or liquid-solid in the fixed bed, which can be used to analyze phenomena such as fluid distribution, pressure drop and or flow pattern transition; the numerical simulation of the heat transfer of the bed mainly studies the heat transfer process in the fixed bed, including the heat exchange between gas-liquid-solid, the temperature distribution inside the bed, and the influence of external heating or cooling; the numerical simulation of the reaction of the bed mainly studies the chemical reaction process in the fixed bed, including the reaction rate, product distribution, conversion rate and / or reaction kinetics. The above technical scheme can realize the determination of the geometric dimensions that meet the design requirements of the two-phase flow of the bed, the heat transfer of the bed, and the reaction of the bed.

[0053] S140. When the first simulation result meets the preset first design requirement, determine a target design scheme of the trickle bed reactor according to the geometric dimensions.

[0054] Among them, the first design requirement is that when the first simulation result is satisfied, the geometric dimensions can be directly used for the subsequent steps; in the embodiment of the present invention, the content of the first design requirement can correspond to the simulation type of the two-dimensional computational fluid dynamics simulation, and the first design requirement can be determined according to the technical requirements of the trickle bed reactor. In the embodiment of the present invention, the content of the first design requirement is not specifically limited. The target design scheme is the design scheme of the trickle bed reactor obtained by the final requirement.

[0055] For example, the reactant conversion rate, bed temperature difference and pressure drop can be determined according to the numerical simulation results of the two-phase flow of the bed, the numerical simulation results of the heat transfer of the bed and the numerical simulation results of the bed reaction in the first simulation result; when the reactant conversion rate, the bed temperature difference and the pressure drop meet the first design requirement, the first simulation result meets the preset first design requirement. In the embodiment of the present invention, the method for judging whether the first simulation result meets the preset first design requirement is not specifically limited.

[0056] The technical solution of the embodiment of the present invention is to determine the geometric dimensions of the trickle bed reactor to be designed, and establish a two-dimensional geometric model of the trickle bed reactor according to the geometric dimensions, so as to establish the two-dimensional geometric model of the trickle bed reactor; to obtain the associated material parameters of the trickle bed reactor, and determine the inlet conditions according to the geometric dimensions and the associated material parameters, so as to determine the inlet conditions required for two-dimensional computational fluid dynamics simulation; to perform two-dimensional computational fluid dynamics simulation according to the two-dimensional geometric model and the inlet conditions, and obtain the first simulation result, so as to simulate the flow in the two-dimensional geometric model; to determine the target design scheme of the trickle bed reactor according to the geometric dimensions when the first simulation result meets the preset first design requirement, so as to determine the accurate target design scheme. The above technical solution obtains the first simulation result of the evaluation result of the trickle bed reactor corresponding to the geometric dimensions by performing two-dimensional computational fluid dynamics simulation on the established two-dimensional geometric model, and determines the target design scheme of the trickle bed reactor according to the geometric dimensions when the first simulation result meets the preset first design requirement, so that the target design scheme can meet the design requirements, thereby improving the accuracy of the design scheme of the trickle bed reactor.

[0057] An optional technical solution, a trickle bed reactor design method, further includes: when the first simulation result does not meet the preset first design requirement, redetermining the geometric dimensions and repeating the step of obtaining the associated material parameters of the trickle bed reactor.

[0058] In the embodiment of the present invention, for example, the parameters used to determine the geometric dimensions may be changed; for another example, the geometric dimensions may be re-determined in other ways; for another example, the geometric dimensions may be adjusted; etc. The method for re-determining the geometric dimensions may be the same as or different from the method for first determining the geometric dimensions of the trickle bed reactor to be designed. In the embodiment of the present invention, the method for re-determining the geometric dimensions is not specifically limited.

[0059] The technical solution of the embodiment of the present invention can avoid the influence of the first simulation result not meeting the preset first design requirement's geometric dimensions, by redetermining the geometric dimensions and repeating the step of obtaining the associated material parameters of the trickle bed reactor when the first simulation result does not meet the preset first design requirement, on the accuracy of the design solution of the trickle bed reactor.

[0060] Another optional technical solution is to determine the inlet conditions according to the geometric dimensions and related material parameters, including: obtaining the target annual output and target annual working hours of the product of the trickle bed reactor; determining the inlet molar flow rate of the liquid phase reactant of the trickle bed reactor according to the target annual output and the target annual working hours; determining the inlet molar concentration of the liquid phase reactant, the inlet molar concentration of the gas phase reactant and the inlet gas-liquid volume ratio of the trickle bed reactor according to the related material parameters; determining the bed inlet velocity of the trickle bed reactor according to the geometric dimensions, the inlet molar flow rate of the liquid phase reactant and the inlet molar concentration of the liquid phase reactant; determining the bed gas inlet flow rate of the trickle bed reactor according to the inlet gas-liquid volume ratio and the inlet molar flow rate of the liquid phase reactant; determining the bed gas inlet velocity according to the inlet molar concentration of the gas phase reactant, the bed gas inlet flow rate and the geometric dimensions; and using at least one of the inlet molar flow rate of the liquid phase reactant, the inlet molar concentration of the liquid phase reactant, the inlet molar concentration of the gas phase reactant, the inlet gas-liquid volume ratio, the bed inlet velocity, the bed gas inlet flow rate and the bed gas inlet velocity as the inlet condition.

[0061] Among them, the target annual output is the annual output of the product target demand of the trickle bed reactor. The target annual working hours are the annual working hours of the trickle bed reactor target demand. The inlet liquid reactant molar flow rate is the number of moles of liquid reactant entering the trickle bed reactor through the inlet per unit time. The inlet molar concentration of liquid reactant is the number of moles per unit volume of each component in the liquid reactant entering the trickle bed reactor. The inlet molar concentration of gas reactant is the number of moles per unit volume of each component in the gas reactant entering the trickle bed reactor. The inlet gas-liquid volume ratio is the ratio of the volume flow rates of gas and liquid entering the trickle bed reactor. The bed inlet velocity is the speed at which gas and / or liquid enter the trickle bed reactor. The bed gas inlet velocity is the speed at which gas enters the trickle bed reactor. The bed gas inlet flow rate is the volume or mass of gas entering the trickle bed reactor through the inlet per unit time.

[0062] Exemplarily, the target annual output and target annual working hours of the product of the trickle bed reactor are obtained; according to the target annual output and the target annual working hours, the molar flow rate Q of the product is determined. prod (mol / h), conversion rate η r and selectivity η s ; According to the molar flow rate Q of the product prod (mol / h), conversion rate η r and selectivity η s , through the formula Determine the inlet liquid phase reactant molar flow rate Q of the trickle bed reactor ract,in (mol / h); according to the liquid density ρ in the associated material parameters liq,in (kg / m 3), the proportion of reactants in the liquid phase mass α r and the molar mass of the reactants M ra , through the formula C ra,in =ρ liq,in α r / M ra ×1000, determine the liquid phase reactant inlet molar concentration C ra,in (mol / m 3 );According to the liquid phase reactant inlet molar concentration C ra,in , inlet liquid phase reactant molar flow rate Q ract,in And the diameter D in the geometric dimensions, through the formula Determine the bed inlet velocity u liq (m / s); according to the inlet gas density ρ in the associated material parameters gas,in (kg / m 3 ) and gas phase molar mass M gas , through the formula C gas,in =ρ gas,in / M gas ×1000, determine the inlet molar concentration C of the gas phase reactant gas,in (mol / m 3 ), wherein the inlet gas density and the gas phase molar mass may be parameters of the same gas, and the gas or meteorological parameters mentioned in the embodiments of the present invention may be parameters of the gas; according to the inlet molar concentration C of the gas phase reactant gas,in and the reactant inlet molar concentration C liq,in , through the formula Determine the inlet gas-liquid volume ratio gl , where the reactant inlet molar concentration C liq,in The liquid density ρ in the associated material parameters can be liq,in (kg / m 3 ) and the liquid phase molar mass M liq Determine; according to the inlet gas-liquid volume ratio Ratio gl and the inlet liquid phase reactant molar flow rate Q ract,in , through the formula Q gas,in =Ratio gl Q ract,in , determine the bed gas inlet flow rate Q gas,in ; According to the gas phase reactant inlet molar concentration C gas,in , bed gas inlet flow rate Q gas,in and diameter D, through the formula Determine the bed gas inlet velocity u gas(m / s); at least one of the inlet liquid-phase reactant molar flow rate, the inlet molar concentration of the liquid-phase reactant, the inlet molar concentration of the gas-phase reactant, the inlet gas-liquid volume ratio, the bed inlet velocity, the bed gas inlet flow rate and the bed gas inlet velocity is used as the inlet condition. In the embodiment of the present invention, the inlet liquid-phase reactant molar flow rate of the trickle bed reactor is determined according to the target annual output and the target annual working time, the inlet molar concentration of the liquid-phase reactant, the inlet molar concentration of the gas-phase reactant and the inlet gas-liquid volume ratio of the trickle bed reactor are determined according to the associated material parameters, the bed inlet velocity of the trickle bed reactor is determined according to the geometric dimensions, the inlet liquid-phase reactant molar flow rate and the inlet molar concentration of the liquid-phase reactant, the bed gas inlet flow rate of the trickle bed reactor is determined according to the inlet gas-liquid volume ratio and the inlet liquid-phase reactant molar flow rate, and the bed gas inlet velocity is determined according to the inlet molar concentration of the gas-phase reactant, the bed gas inlet flow rate and the geometric dimensions. There is no specific limitation on the method.

[0063] The above technical scheme can improve the accuracy and comprehensiveness of the inlet conditions by using at least one of the calculated inlet liquid reactant molar flow rate, liquid reactant inlet molar concentration, gas reactant inlet molar concentration, inlet gas-liquid volume ratio, bed inlet velocity, bed gas inlet flow rate and bed gas inlet velocity as the inlet conditions.

[0064] Another optional technical solution is that the number of geometric dimensions is at least one group, the number of target design solutions is at least one, and each geometric dimension corresponds to each target design solution one by one; the trickle bed reactor design method also includes: comparing the target design solutions corresponding to the at least one group of geometric dimensions, and determining the best design solution from the target design solutions corresponding to the at least one group of geometric dimensions based on the comparison results.

[0065] The best design solution is the solution that best meets the design requirements among the target design solutions corresponding to at least one set of geometric dimensions.

[0066] In the embodiment of the present invention, at least one group of different geometric dimensions can be determined. For example, the geometric dimensions can be determined according to the associated material parameters. At least one group of associated material parameters can be obtained to determine the geometric dimensions for each group of associated material parameters according to the associated material parameters. For another example, at least one group of preset different geometric dimensions can be obtained as at least one group of geometric dimensions, and so on. For each group of geometric dimensions in at least one group of geometric dimensions, the target design scheme corresponding to at least one group of geometric dimensions can be determined through the above-mentioned trickle bed reactor design process. The target design schemes corresponding to at least one group of geometric dimensions are comprehensively compared, and based on the comparison results, the best design scheme is determined from the target design schemes corresponding to at least one group of geometric dimensions.

[0067] In the embodiment of the present invention, the manner of comprehensively comparing the target design solutions corresponding to at least one set of geometric dimensions is not specifically limited.

[0068] In the embodiment of the present invention, for example, the best design solution can be determined from the target design solutions corresponding to at least one group of geometric dimensions according to the second design requirement, the first design requirement, and at least one of the preset technical requirements, and the comparison result. In the embodiment of the present invention, the method of determining the best design solution from the target design solutions corresponding to at least one group of geometric dimensions according to the comparison result is not specifically limited.

[0069] In the embodiment of the present invention, by comparing the target design schemes corresponding to at least one set of geometric dimensions and then determining the best design scheme that best meets the design requirements, the accuracy of the design scheme of the trickle bed reactor can be further improved.

[0070] Another optional technical solution, after determining the target design scheme of the trickle bed reactor according to the geometric dimensions, the trickle bed reactor design method also includes: determining the engineering optimization scheme of the trickle bed reactor based on the target design scheme, wherein the engineering optimization scheme includes at least one of catalyst particle size, hydrogen-to-oil ratio, inlet velocity distribution, inlet temperature, inlet pressure to bed temperature distribution, temperature difference, pressure drop, component distribution and conversion rate.

[0071] Among them, the engineering optimization plan is a plan to optimize the engineering aspects of the trickle bed reactor.

[0072] In an embodiment of the present invention, after obtaining the target design scheme, the catalyst particle size, hydrogen-to-oil ratio, inlet velocity distribution, inlet temperature, inlet pressure of the trickle bed reactor can be optimized on the basis of the target design scheme to optimize at least one of the temperature distribution, temperature difference, pressure drop, component distribution and conversion rate of the bed layer, so that the trickle bed reactor designed according to the target design scheme and the engineering optimization scheme can better meet the needs.

[0073] Another optional technical solution is that before performing a two-dimensional computational fluid dynamics simulation according to the two-dimensional geometric model and the inlet conditions to obtain a first simulation result, the trickle bed reactor design method also includes: using a preset structural grid division scheme to grid the two-dimensional geometric model to obtain a first grid division result, and determining a first grid division strategy based on the first grid division result; performing a two-dimensional computational fluid dynamics simulation according to the two-dimensional geometric model and the inlet conditions to obtain a first simulation result, including: performing a two-dimensional computational fluid dynamics simulation according to the two-dimensional geometric model, the first grid division strategy and the inlet conditions to obtain a first simulation result.

[0074] Among them, the structural meshing scheme is a structural meshing scheme for a two-dimensional geometric model; the structural meshing scheme may include mesh encryption at the wall position of the two-dimensional geometric model to ensure the stability and calculation accuracy of subsequent simulations. The first meshing result is the result obtained by meshing the two-dimensional geometric model using a preset structural meshing scheme. The first meshing strategy is the strategy finally used to mesh the two-dimensional geometric model.

[0075] Exemplarily, the two-dimensional geometric model can be imported into the ICEMCFD software, and the ICEMCFD software can be used to perform meshing on the reactor bed calculation domain in the two-dimensional geometric model using a preset structural meshing scheme to obtain a first meshing result. In the embodiment of the present invention, the method of using a preset structural meshing scheme to perform meshing on the two-dimensional geometric model to obtain the first meshing result is not specifically limited.

[0076] In an embodiment of the present invention, for example, a first mesh division result can be subjected to mesh independence verification to obtain a first verification result. When the first verification result indicates that the first mesh division result has reached a mesh-independent solution, the first mesh division result is used as a first mesh division strategy. When the first verification result indicates that the first mesh division result has not reached a mesh-independent solution, the structural mesh division scheme is adjusted, and the steps of using a preset structural mesh division scheme to mesh the two-dimensional geometric model and obtain a first mesh division result are repeatedly executed.

[0077] In an embodiment of the present invention, before performing a two-dimensional computational fluid dynamics simulation according to a two-dimensional geometric model, a first grid division strategy and an inlet condition to obtain a first simulation result, a closed condition may be set for the two-dimensional geometric model to obtain a second setting result; performing a two-dimensional computational fluid dynamics simulation according to the two-dimensional geometric model, a first grid division strategy and an inlet condition to obtain a first simulation result includes: performing a two-dimensional computational fluid dynamics simulation according to the second setting result, the two-dimensional geometric model, the first grid division strategy and the inlet condition to obtain a first simulation result.

[0078] For example, see Figure 2 and Figure 3 , Figure 2 and Figure 3 This includes the main components and geometric variables of the 2D geometric model, as well as the boundary conditions in the 2D computational domain and the second setting result. Figure 2 The simulation work of the two-dimensional geometric model focuses on flow, heat transfer, component transport and reaction. In order to save computational cost, the circumferential distribution is considered uniform and simplified to a two-dimensional problem, and the gradation of the bed is not considered; see Figure 3The computational domain of the two-dimensional geometric model is the bed. The gas-liquid velocity, temperature and component concentration are given at the bed inlet. The outlet boundary is set as the fully developed outflow boundary, and the left and right sides are walls; see Figure 2 ,The main geometric variables of the two-dimensional geometric model are the bed diameter, bed height, the number of gas-liquid distributors and the diameter of their center tube, which can be determined according to the geometric dimensions and the preset design scheme.

[0079] Exemplarily, according to the second setting result, the two-dimensional geometric model, the first meshing strategy and the inlet condition, a two-dimensional (2D) implicit solver can be selected in the Fluent software, the porous medium Euler-Euler multiphase model can be selected, the energy conservation module can be checked, and the source term can be added according to the reaction in the component transport, so that the Fluent software can initialize the two-dimensional calculation domain of the two-dimensional geometric model through the above data and settings, and perform iterative calculations. When the residual meets the calculation requirements, the loop iteration is stopped to obtain and export the first simulation result. In the embodiment of the present invention, the method of performing a two-dimensional computational fluid dynamics simulation according to the two-dimensional geometric model, the first meshing strategy and the inlet condition to obtain the first simulation result is not specifically limited.

[0080] In an embodiment of the present invention, a first grid division strategy is obtained through a structural grid division scheme, and a two-dimensional computational fluid dynamics simulation is performed based on the two-dimensional geometric model, the first grid division strategy and the inlet conditions to obtain a first simulation result. The continuous physical domain in the two-dimensional geometric model can be discretized into a series of small control volumes or units, thereby improving the calculation accuracy of the first simulation result and ensuring the convergence, stability and geometric adaptability of the simulation.

[0081] Figure 4 It is a flow chart of another trickle bed reactor design method provided in an embodiment of the present invention. This embodiment is optimized based on the above-mentioned technical solutions. In this embodiment, optionally, the target design scheme of the trickle bed reactor is determined according to the geometric dimensions, including: establishing a three-dimensional geometric model of the trickle bed reactor according to the geometric dimensions and the preset design scheme of the trickle bed reactor; performing a three-dimensional computational fluid dynamics simulation according to the three-dimensional geometric model to obtain a second simulation result; when the second simulation result meets the preset second design requirements, determining the target design scheme of the trickle bed reactor according to the preset design scheme and the geometric dimensions. Among them, the explanations of the terms that are the same or corresponding to the above-mentioned embodiments are not repeated here.

[0082] See also Figure 4 The method of this embodiment may specifically include the following steps:

[0083] S210, determining the geometric dimensions of the trickle bed reactor to be designed, and establishing a two-dimensional geometric model of the trickle bed reactor based on the geometric dimensions.

[0084] S220, obtaining the associated material parameters of the trickle bed reactor, and determining the inlet conditions according to the geometric dimensions and the associated material parameters.

[0085] S230, performing a two-dimensional computational fluid dynamics simulation according to the two-dimensional geometric model and the inlet conditions to obtain a first simulation result.

[0086] S240. When the first simulation result meets the preset first design requirement, a three-dimensional geometric model of the trickle bed reactor is established according to the geometric dimensions and the preset design scheme of the trickle bed reactor.

[0087] The preset design scheme is a preset design scheme of a trickle bed reactor; the preset design scheme may be, for example, that the gas-liquid inlet of the trickle bed reactor is a cylinder, a single gas-liquid distributor is simplified to a circular hole, and the filler in the bed is layered into multiple porous medium regions according to the filler particle diameter, etc. In the embodiment of the present invention, the content of the preset design scheme is not specifically limited. The three-dimensional geometric model is a three-dimensional geometric model of the trickle bed reactor.

[0088] For example, a three-dimensional geometric model including a gas-liquid inlet cylinder, a gas-liquid distributor, and inert particles and catalyst particle gradations in the bed can be established based on the height and diameter in the geometric dimensions and the preset design scheme using SolidWorks software, a three-dimensional computer-aided design software developed by Dassault Systèmes. In the embodiment of the present invention, there is no specific limitation on the method of establishing the three-dimensional geometric model of the trickle bed reactor based on the geometric dimensions and the preset design scheme of the trickle bed reactor.

[0089] S250, performing a three-dimensional computational fluid dynamics simulation according to the three-dimensional geometric model to obtain a second simulation result.

[0090] Among them, the three-dimensional computational fluid dynamics simulation is to use computational fluid dynamics to simulate the fluid flow of the three-dimensional geometric model. The second simulation result is the result obtained by performing a three-dimensional computational fluid dynamics simulation on the three-dimensional geometric model; in the embodiment of the present invention, the content of the second simulation result can correspond to the simulation type of the three-dimensional computational fluid dynamics simulation, and in the embodiment of the present invention, the content of the second simulation result is not specifically limited.

[0091] In the embodiment of the present invention, for example, a three-dimensional computational fluid dynamics simulation can be performed based on the three-dimensional geometric model to simulate the gas-liquid flow of the entire trickle bed reactor, and the second simulation result can be obtained by combining the bed pressure drop and the uniformity of gas-liquid distribution, etc. In the embodiment of the present invention, the method of performing a three-dimensional computational fluid dynamics simulation based on the three-dimensional geometric model to obtain the second simulation result is not specifically limited.

[0092] Optionally, the three-dimensional computational fluid dynamics simulation includes a two-phase flow numerical simulation. Accordingly, the second simulation result may include a two-phase flow numerical simulation result. Among them, two-phase flow numerical simulation is an important branch of computational fluid dynamics, which is used to study the flow characteristics of a fluid system with two different phases. The above technical solution can achieve a target design solution that meets the design requirements at the two-phase flow level from the determination.

[0093] S260. When the second simulation result meets the preset second design requirement, determine a target design scheme for the trickle bed reactor according to the preset design scheme and geometric dimensions.

[0094] Among them, the second design requirement is that when the second simulation result is met, the requirements of the target design scheme of the trickle bed reactor can be determined according to the preset design scheme and geometric dimensions; in the embodiment of the present invention, the content of the second design requirement can correspond to the simulation type of the three-dimensional computational fluid dynamics simulation, and the second design requirement can be determined according to the technical requirements of the trickle bed reactor. In the embodiment of the present invention, the content of the second design requirement is not specifically limited.

[0095] For example, the gas-liquid distribution and pressure drop of the bed layer can be determined according to the two-phase flow numerical simulation results in the second simulation results; when the gas-liquid distribution and pressure drop of the bed layer do not meet the second design requirement, the second simulation result does not meet the preset second design requirement. In the embodiment of the present invention, the method for judging whether the second simulation result meets the preset second design requirement is not specifically limited.

[0096] In the embodiment of the present invention, for example, at least one of the gas-liquid inlet diameter, gas-liquid distributor arrangement, gas-liquid distributor diameter, number of gas-liquid distributors, and bed particle gradation of the trickle bed reactor can be determined according to the preset design scheme and geometric dimensions, and at least one of the gas-liquid inlet diameter, gas-liquid distributor arrangement, gas-liquid distributor diameter, number of gas-liquid distributors, and bed particle gradation is used as the target design scheme. In the embodiment of the present invention, the method of determining the target design scheme of the trickle bed reactor according to the preset design scheme and geometric dimensions is not specifically limited.

[0097] The technical solution of the embodiment of the present invention is to establish a three-dimensional geometric model of the trickle bed reactor according to the geometric dimensions and the preset design scheme of the trickle bed reactor, so as to establish the three-dimensional geometric model of the trickle bed reactor; to perform a three-dimensional computational fluid dynamics simulation according to the three-dimensional geometric model to obtain a second simulation result, so as to simulate the flow in the three-dimensional geometric model; and to determine the target design scheme of the trickle bed reactor according to the preset design scheme and the geometric dimensions when the second simulation result meets the preset second design requirement, so as to determine the accurate target design scheme. The above technical solution is to obtain a second simulation result of the evaluation result of the trickle bed reactor corresponding to the preset design scheme and the geometric dimensions by performing a three-dimensional computational fluid dynamics simulation on the established three-dimensional geometric model, and to determine the target design scheme according to the preset design scheme and the geometric dimensions when the second simulation result meets the preset second design requirement, so that the target design scheme can meet the design requirements, thereby further improving the accuracy of the design scheme of the trickle bed reactor.

[0098] An optional technical solution, a trickle bed reactor design method, also includes: when the second simulation result does not meet the preset second design requirement, adjusting the preset design scheme, and repeating the step of establishing a three-dimensional geometric model of the trickle bed reactor based on the geometric dimensions and the preset design scheme of the trickle bed reactor.

[0099] For example, when the second simulation result does not meet the preset second design requirement, at least one of the gas-liquid inlet diameter, gas-liquid distributor arrangement, gas-liquid distributor diameter, gas-liquid distributor number, and bed particle gradation of the trickle bed reactor in the preset design scheme may be adjusted. In the embodiment of the present invention, the method for adjusting the preset design scheme is not specifically limited.

[0100] In an embodiment of the present invention, by adjusting the preset design scheme when the second simulation result does not meet the preset second design requirement, and repeatedly executing the step of establishing a three-dimensional geometric model of the trickle bed reactor according to the geometric dimensions and the preset design scheme of the trickle bed reactor, it is possible to avoid the influence of the preset design scheme that makes the second simulation result fail to meet the preset second design requirement on the accuracy of the design scheme of the trickle bed reactor.

[0101] Another optional technical solution, before performing a three-dimensional computational fluid dynamics simulation based on the three-dimensional geometric model to obtain a second simulation result, also includes: using a preset unstructured grid division scheme to grid the three-dimensional geometric model to obtain a second grid division result, and determining a second grid division strategy based on the second grid division result; performing a three-dimensional computational fluid dynamics simulation based on the three-dimensional geometric model to obtain a second simulation result, including: performing a three-dimensional computational fluid dynamics simulation based on the three-dimensional geometric model and the second grid division strategy to obtain a second simulation result.

[0102] Among them, the unstructured meshing scheme is an unstructured meshing scheme for a three-dimensional geometric model; the unstructured meshing scheme may include mesh encryption at the wall and opening positions of the three-dimensional geometric model to ensure the stability and calculation accuracy of subsequent simulations. The second meshing result is the result obtained by meshing the three-dimensional geometric model using a preset unstructured meshing scheme. The second meshing strategy is the strategy finally used to mesh the three-dimensional geometric model.

[0103] Exemplarily, the three-dimensional geometric model can be imported into the integrated computer engineering and manufacturing computational fluid dynamics pre-processing software (The Integrated Computer Engineering and Manufacturing code for Computational Fluid Dynamics, ICEM CFD), so that the ICEM CFD software uses a preset non-structured meshing scheme to mesh the reactor bed calculation domain in the three-dimensional geometric model to obtain a second meshing result. In the embodiment of the present invention, the method of meshing the three-dimensional geometric model using a preset non-structured meshing scheme to obtain the second meshing result is not specifically limited.

[0104] In an embodiment of the present invention, for example, the second mesh division result can be verified for mesh independence to obtain a second verification result. When the second verification result indicates that the second mesh division result has reached a mesh independent solution, the second mesh division result is used as the second mesh division strategy. When the second verification result indicates that the second mesh division result has not reached a mesh independent solution, the unstructured mesh division scheme is adjusted, and the step of using a preset unstructured mesh division scheme to mesh the three-dimensional geometric model and obtain the second mesh division result is repeatedly executed. In an embodiment of the present invention, there is no specific limitation on the method of determining the second mesh division strategy according to the second mesh division result.

[0105] In an embodiment of the present invention, before performing a three-dimensional computational fluid dynamics simulation according to a three-dimensional geometric model and a second grid division strategy to obtain a second simulation result, a closed condition may be set for the two-dimensional geometric model to obtain a first setting result; performing a three-dimensional computational fluid dynamics simulation according to the three-dimensional geometric model and the second grid division strategy to obtain a second simulation result includes: performing a three-dimensional computational fluid dynamics simulation according to the first setting result, the three-dimensional geometric model and the second grid division strategy to obtain a second simulation result.

[0106] For example, see Figure 5 , Figure 6 and Figure 7 , Figure 5 , Figure 6 and Figure 7 Includes the main components and geometric variables of the 3D geometric model. For details, see Figure 5 , three-dimensional geometric model gas and liquid enter the upper head from the gas-liquid premixing pipe, enter the bed after passing through several gas-liquid distributors installed on the distribution plate, pass through the bed layer filled with m layers of inert particles and catalyst particles, and finally leave from the lower head; see Figure 6 and Figure 7 The geometric variables of the three-dimensional geometric model include bed diameter D, bed height H, premixing diameter d2, n gas-liquid distributors and their central tube diameter d1, cavity height h0, first layer inert particle height h1, second layer inert particle height h2, third layer catalyst particle height h3, ..., m-1th layer inert particle height h m-1 and the height of the mth layer of inert particles h m , the geometric variables can be determined according to the geometric dimensions and the preset design scheme.

[0107] Exemplarily, according to the first setting result, the three-dimensional geometric model and the second meshing strategy, a three-dimensional (3D) implicit solver can be selected in the Fluent software, and the porous medium Euler-Euler multiphase model can be selected, so that the Fluent software can initialize the three-dimensional calculation domain of the three-dimensional geometric model through the above data and settings, and perform iterative calculations. When the residual meets the calculation requirements, the loop iteration is stopped to obtain and export the second simulation result. It should be noted that the three-dimensional computational fluid dynamics simulation may also require an inlet condition, which may be the same as or different from the determination method of the inlet condition used in the two-dimensional computational fluid dynamics simulation. The inlet condition can also be determined according to the needs, test results and / or technical requirements, and is not specifically limited here. In the embodiment of the present invention, the method of performing a three-dimensional computational fluid dynamics simulation according to the three-dimensional geometric model and the second meshing strategy to obtain the second simulation result is not specifically limited.

[0108] In an embodiment of the present invention, a second grid division strategy is obtained through an unstructured grid division scheme, and a three-dimensional computational fluid dynamics simulation is performed based on the three-dimensional geometric model and the second grid division strategy to obtain a second simulation result. The continuous physical domain in the three-dimensional geometric model can be discretized into a series of small control volumes or units, thereby improving the calculation accuracy of the second simulation result and ensuring the convergence, stability and geometric adaptability of the simulation.

[0109] In order to better understand the technical solution of the above embodiment of the present invention, an optional example is provided here. Figure 8 , perform engineering design calculations that satisfy the conservation of matter and energy at the inlet and outlet of the bed layer of the trickle bed reactor to obtain geometric dimensions; if the geometric dimensions do not satisfy the preset engineering design requirements, repeat the steps of performing engineering design calculations that satisfy the conservation of matter and energy at the inlet and outlet of the bed layer of the trickle bed reactor to obtain geometric dimensions; if the geometric dimensions satisfy the preset engineering design requirements, perform multi-process two-dimensional computational fluid dynamics simulation calculations of two-dimensional two-phase flow, heat transfer and reaction of the bed layer of the trickle bed reactor; if the first simulation result obtained does not satisfy the preset first design requirement, repeat the steps of performing engineering design calculations that satisfy the conservation of matter and energy at the inlet and outlet of the bed layer of the trickle bed reactor to obtain geometric dimensions. step; when the first simulation result obtained satisfies the preset first design requirement, a three-dimensional computational fluid dynamics simulation calculation of the design calculation of the internal components and bed particle gradation of the entire trickle bed reactor is performed; when the second simulation result obtained indicates that the radial and axial gas-liquid distributions of the reactor do not meet the preset second design requirement, the engineering design calculation that satisfies the conservation of matter and energy at the inlet and outlet of the trickle bed reactor is repeatedly performed to obtain the step of geometric dimensions; when the second simulation result obtained indicates that the radial and axial gas-liquid distributions of the reactor both meet the preset second design requirement, the optimal internal components and bed particle gradation scheme is determined as the target design scheme according to the preset design scheme and geometric dimensions.

[0110] In order to better understand the technical solution of the above-mentioned embodiment of the present invention, another optional example is provided here. Exemplarily, an engineering design calculation that satisfies the conservation of matter and energy at the inlet and outlet of the trickle bed reactor is performed to obtain geometric dimensions; when the geometric dimensions do not meet the preset engineering design requirements, the step of performing the engineering design calculation that satisfies the conservation of matter and energy at the inlet and outlet of the trickle bed reactor is repeated to obtain the geometric dimensions; when the geometric dimensions meet the preset engineering design requirements, a two-dimensional geometric model is established according to the geometric dimensions; a two-dimensional Euler-Euler two-phase flow model is used to couple the component transport model to establish a trickle bed bed two-phase flow, heat transfer and reaction multi-process coupling calculation module, and the distribution of temperature, component and pressure drop in the bed height direction is simulated, and the temperature, conversion rate and pressure drop are determined as the first simulation result according to the distribution of temperature, component and pressure drop in the bed height direction; when the first simulation result does not meet the preset first design requirements, the step of performing the engineering design calculation that satisfies the conservation of matter and energy at the inlet and outlet of the trickle bed reactor is repeated to obtain the geometric dimensions; when the obtained first simulation result meets the preset first design requirements In the case of a preset second design requirement, a three-dimensional geometric model of the entire trickle bed reactor is established according to the geometric dimensions and the pre-mixed inlet pipe diameter in the upper head, the gas-liquid distributor and the bed gradation in the preset design scheme of the trickle bed reactor. A three-dimensional Euler-Euler two-phase flow model is used to establish a calculation module for the flow process of the entire trickle bed reactor, and the uniformity of bed liquid distribution under the conditions of the pre-distributor, the gas-liquid distributor and the bed particle gradation is simulated. The uniformity of bed liquid distribution under the conditions of the pre-distributor, the gas-liquid distributor and the bed particle gradation is taken as the second simulation result. When the second simulation result meets the preset second design requirement, a target design scheme is determined according to the preset design scheme and the geometric dimensions; the above steps are repeated to obtain at least one target design scheme, and the optimal design scheme is determined from the target design schemes corresponding to at least one group of geometric dimensions according to the liquid velocity variation coefficient and the body velocity variation coefficient. The optimal design scheme may include the pre-mixed inlet pipe diameter, the gas-liquid distributor diameter and number, and the filling height of the inlet and outlet two layers of inert particles. The above technical scheme can achieve multi-objective design and optimization that simultaneously meets the engineering design requirements, the two-dimensional bed thermal process and the gas-liquid distribution requirements of the entire three-dimensional trickle bed reactor.

[0111] In order to better understand the technical solution of the above embodiment of the present invention, another optional example is provided here. For example, the trickle bed reactor is a hydrogenation reactor of substance A; the liquid density ρ can be obtained liq,in =969.87(kg / m 3 ); According to the mass ratio of liquid phase A substance and B substance and their respective molar masses, the densities of reactant inlet A substance and B substance were determined to be 288.80 (kg / m 3 ) and 673.86 (kg / m3 ), and then determine the reactant inlet molar concentrations corresponding to substance A and substance B are 1486.26 (mol / m 3 ) and 3366.92(mol / m 3 ); The target annual output of the product C substance of the trickle bed reactor is 20,000 tons / year. According to the target annual output, the mass flow rate of C substance is determined to be 2777.78 (kg / h); According to the conversion rate of B substance 98% and the selectivity 93%, the mass flow rate of inlet B substance is determined to be 4231.77 (kg / h); According to the conversion rate of A substance 97% and the selectivity 92%, the mass flow rate of inlet A substance is determined to be 4598.83 (kg / h); From the above process, the liquid phase inlet mass flow rate can be determined to be 4598.83 (kg / h); The liquid mass space velocity LHSV = 0.3 (h -1 , and according to the liquid phase inlet mass flow rate and liquid mass space velocity, the catalyst mass is determined to be 15840.4 (kg); the bulk density of the catalyst particles in the trickle bed reactor is obtained as ρ bed =766(kg / m 3 ), according to the catalyst mass and bulk density, the catalyst volume is determined as V cata =20.01(m 3 ): Get the preset height-to-diameter ratio of the trickle bed reactor =4.5, according to the height-to-diameter ratio and the catalyst volume, determine the geometric dimensions of the bed layer of the trickle bed reactor, including height H = 10.3m and diameter D = 1.6m, H = 10.3m. Obtain the target annual working time as 7200 hours; according to the target annual output and target annual working time, determine the molar flow rate Q of the product prod =19262.03 (mol / h), conversion rate of substance B η r =98% and selectivity η s =93%; According to the molar flow rate, conversion rate and selectivity of the product, determine the inlet liquid phase reactant molar flow rate Q of the inlet liquid phase intermediate product B substance DMCD,in =21134.55 (mol / h); Determine the conversion rate η of substance A r =97% and selectivity η s =92%, according to the conversion rate and selectivity of substance A, the molar flow rate of liquid phase reactant substance A at the reactor inlet is determined as Q DMT,in =23682.83 (mol / h); according to liquid density ρ liq,in =969.87(kg / m 3 ), the proportion of reactant A in the liquid phase mass α r = 0.3 and the molar mass of the reactant M of substance A DMT=194.184 (g / mol), determine the liquid phase reactant inlet molar concentration C of substance A DMT,in =23682.83(mol / m 3 );Determine the bed inlet velocity u according to the inlet molar concentration of the liquid phase reactant, the inlet molar flow rate of the liquid phase reactant and the diameter liq =0.0021(m / s); Determine the inlet hydrogen-to-oil ratio gl =120, determine the molar flow rate of hydrogen based on the inlet hydrogen-to-oil ratio Hydrogen mass flow rate 5.68×10 6 (kg / h); due to the mass content of hydrogen in the gas phase The gas mass flow rate at the reactor inlet can be determined Determine the bed gas inlet velocity u according to the reactor inlet gas mass flow rate and diameter gas =0.133 (m / s); using at least one of the inlet liquid phase reactant molar flow rate, liquid phase reactant inlet molar concentration, gas phase reactant inlet molar concentration, inlet gas-liquid volume ratio, bed inlet velocity, bed gas inlet flow rate and bed gas inlet velocity obtained above as the inlet condition for determining the computational fluid dynamics simulation calculation; using Solidworks to establish a two-dimensional geometric model of the bed of the trickle bed reactor according to the height and diameter; importing the two-dimensional geometric model into ICEM The CFD software uses a structural meshing scheme to mesh the reactor bed calculation domain. When meshing, the mesh is encrypted at the wall to ensure the stability and calculation accuracy of the subsequent simulation; the mesh independence verification is performed, and the first meshing strategy is determined based on the verification results; the closed conditions are set for the calculation domain boundary of the two-dimensional geometric model to obtain the second setting result; according to the two-dimensional geometric model, the first meshing strategy, the inlet conditions and the second setting result, the 2D implicit solver is selected in Fluent, the porous medium Euler-Euler multiphase model is selected, the energy conservation module is checked, and the source term is added according to the reaction in the component transport, the two-dimensional calculation domain is initialized, and iterative calculation is performed. When the residual satisfies <10 -3 Then stop the iteration cycle; derive the numerical simulation results of the two-phase flow, heat transfer and reaction in the bed; Based on the numerical simulation results of the two-phase flow, heat transfer and reaction in the bed, the bed temperature distribution and pressure of the trickle bed reactor can be obtained. For details, see Fig. 9 and Fig.10It can be seen that the bed temperature difference is 24.5℃, which meets the first design requirement that the maximum temperature difference is less than 30℃, and the bed pressure drop is 30Kpa, which also meets the first design requirement; in order to obtain the best reactor height-diameter ratio, the steps of obtaining liquid density can be repeated, and the diameters of 1.4m and 1.8m are obtained respectively, to compare the bed temperature and component molar concentration distribution under different height-diameter ratios. For details, see Fig.11 and Fig.12 ; The catalyst particle size, hydrogen-to-oil ratio, inlet velocity distribution, inlet temperature, inlet pressure and the temperature distribution, temperature difference, pressure drop, component distribution and conversion rate of the bed are comprehensively considered. According to the results, it can be concluded that the geometric dimensions are 1.6m×10.3m, the catalyst particle size is 4mm, the hydrogen-to-oil ratio is 125, the inlet velocity is uniform, the inlet temperature is 215℃, and the inlet pressure is 11.91MPa as the first design scheme. The preset design scheme is that the gas-liquid inlet of the trickle bed reactor is a cylinder, the single gas-liquid distributor is simplified as a circular hole, and the filler in the bed is layered into multiple porous medium areas according to the filler particle diameter, see Fig.13 and Fig.14 Based on the preset design, height and diameter, a three-dimensional geometric model including the gas-liquid inlet cylinder, gas-liquid distributor, inert particles in the bed and catalyst particle grading was established using Solidworks; see Fig.15 , import the 3D geometric model into ICEM CFD software, adopt the unstructured meshing scheme, mesh the reactor bed calculation domain, and encrypt the mesh at the wall and opening position to ensure the stability and calculation accuracy of the subsequent simulation; perform mesh independence verification, and determine the second meshing strategy based on the verification results; see Fig.16 , set the closed condition for the computational domain boundary of the 3D geometric model, and obtain the first setting result; according to the 3D geometric model, the second meshing strategy and the first setting result, select the 3D implicit solver in Fluent, select the porous medium Euler-Euler multiphase model, initialize the 3D computational domain, perform iterative calculations, and stop the loop iteration when the residual meets the requirements; see Fig.17 , Fig.18 , Fig.19 , Fig. 20 , Fig.21 as well as Fig. 22The influence of the main design parameters on the liquid phase distribution of the bed is studied, and the numerical simulation results of the two-phase flow in the entire trickle bed reactor are derived; when the numerical simulation results of the two-phase flow meet the preset second design requirements, the target design scheme of the trickle bed reactor is determined according to the preset design scheme and geometric dimensions; the step of obtaining the liquid density is performed multiple times, and based on the uniformity of the bed liquid phase distribution and the multiple target design schemes obtained, the second design scheme is determined to be a trickle bed reactor with a gas-liquid premixing inlet diameter of 0.45m, a gas-liquid distributor with a regular triangle distribution, a central tube diameter of 42mm, a hole spacing of 126mm, a first inert particle bed height of 0.215m, a second inert bed height of 0.63m, and a catalyst bed of 10.3m. According to the first design scheme and the second design scheme, the optimal design scheme is a geometric dimension of 1.6m×10.3m, a catalyst particle size of 4mm, a hydrogen-to-oil ratio of 125, an inlet temperature of 215°C, an inlet pressure of 11.91MPa, a gas-liquid premix inlet diameter of 0.45m, a gas-liquid distributor in a regular triangle distribution, a central tube diameter of 42mm, a hole spacing of 126mm, an opening rate of 15%, a first inert particle bed height of 0.215m, and a second inert bed height of 0.63m.

[0112] At present, the engineering design of the trickle bed reactor only meets the conservation of inlet and outlet materials and energy. In the process of optimizing the design scheme, the determination of the effect of the trickle bed reactor can only be verified in the engineering commissioning. The above technical scheme of the embodiment of the present invention first performs engineering design on the material and energy constant calculation of the trickle bed reactor from an engineering perspective; then simulates and calculates the two-dimensional thermal process of the bed of the trickle bed reactor, because the reaction itself and heat transfer are considered, it can be used to verify the rationality of the engineering design scheme; finally, the gas-liquid flow of the three-dimensional integral trickle bed reactor containing the main internal components and bed gradation information is simulated and calculated, and the design scheme of the trickle bed internal components and bed gradation is optimized by hydraulic data. Therefore, the above technical scheme of the embodiment of the present invention can obtain a trickle bed reactor with multi-angle and multi-variable evaluation, making the design scheme of the trickle bed reactor more accurate and comprehensive; and considering that in the design and optimization of the trickle bed reactor, if cold and hot experimental studies are used, the experimental cost is high and the cycle is long. The advantages and targeted points of the engineering design and two-dimensional and three-dimensional computational fluid dynamics simulation are combined to form a closed-loop design and optimization, which has the advantages of short cycle and low cost.

[0113] Fig.23This is a structural block diagram of a trickle bed reactor design device provided in an embodiment of the present invention, and the device is used to execute the trickle bed reactor design method provided in any of the above embodiments. The device and the trickle bed reactor design method of the above embodiments belong to the same inventive concept. For details not described in detail in the embodiment of the trickle bed reactor design device, please refer to the embodiment of the trickle bed reactor design method. Fig.23 The device may specifically include: a two-dimensional geometric model building module 310, an entry condition determination module 320, a first simulation result obtaining module 330 and a target design solution determination module 340.

[0114] The two-dimensional geometric model building module 310 is used to determine the geometric dimensions of the trickle bed reactor to be designed, and to build a two-dimensional geometric model of the trickle bed reactor according to the geometric dimensions;

[0115] An inlet condition determination module 320 is used to obtain the associated material parameters of the trickle bed reactor and determine the inlet conditions according to the geometric dimensions and the associated material parameters;

[0116] A first simulation result obtaining module 330 is used to perform a two-dimensional computational fluid dynamics simulation according to the two-dimensional geometric model and the inlet conditions to obtain a first simulation result;

[0117] The target design scheme determination module 340 is used to determine the target design scheme of the trickle bed reactor according to the geometric dimensions when the first simulation result meets the preset first design requirement.

[0118] Optionally, the device further comprises:

[0119] The first repeated execution module is used to redefine the geometric dimensions and repeatedly execute the step of obtaining the associated material parameters of the trickle bed reactor when the first simulation result does not meet the preset first design requirement.

[0120] Optionally, the entry condition determination module 320 includes:

[0121] A target annual working time acquisition submodule is used to obtain the target annual output and target annual working time of the product of the trickle bed reactor;

[0122] An inlet liquid phase reactant molar flow rate determination submodule, used to determine the inlet liquid phase reactant molar flow rate of the trickle bed reactor according to the target annual output and the target annual working hours;

[0123] An inlet gas-liquid volume ratio determination submodule is used to determine the inlet molar concentration of the liquid phase reactant, the inlet molar concentration of the gas phase reactant and the inlet gas-liquid volume ratio of the trickle bed reactor according to the associated material parameters;

[0124] A bed inlet velocity determination submodule is used to determine the bed inlet velocity of the trickle bed reactor according to the geometric dimensions, the inlet liquid phase reactant molar flow rate and the inlet molar concentration of the liquid phase reactant;

[0125] A bed gas inlet flow rate determination submodule is used to determine the bed gas inlet flow rate of the trickle bed reactor according to the inlet gas-liquid volume ratio and the inlet liquid phase reactant molar flow rate;

[0126] A bed gas inlet velocity determination submodule is used to determine the bed gas inlet velocity according to the gas phase reactant inlet molar concentration, the bed gas inlet flow rate and the geometric dimensions;

[0127] The inlet condition is a submodule used to take at least one of the inlet liquid reactant molar flow rate, liquid reactant inlet molar concentration, gas reactant inlet molar concentration, inlet gas-liquid volume ratio, bed inlet velocity, bed gas inlet flow rate and bed gas inlet velocity as the inlet condition.

[0128] Optionally, the two-dimensional computational fluid dynamics simulation includes at least one of a numerical simulation of two-phase flow in the bed, a numerical simulation of heat transfer in the bed, and a numerical simulation of reaction in the bed.

[0129] Optionally, the target design solution determination module 340 includes:

[0130] A three-dimensional geometric model building submodule is used to build a three-dimensional geometric model of the trickle bed reactor according to the geometric dimensions and the preset design scheme of the trickle bed reactor;

[0131] A second simulation result obtaining submodule is used to perform a three-dimensional computational fluid dynamics simulation according to the three-dimensional geometric model to obtain a second simulation result;

[0132] The target design scheme determination submodule is used to determine the target design scheme of the trickle bed reactor according to the preset design scheme and geometric dimensions when the second simulation result meets the preset second design requirement.

[0133] Optionally, based on the above device, the device further includes:

[0134] The second repeated execution module is used to adjust the preset design scheme when the second simulation result does not meet the preset second design requirement, and repeatedly execute the steps of establishing a three-dimensional geometric model of the trickle bed reactor according to the geometric dimensions and the preset design scheme of the trickle bed reactor.

[0135] Optionally, based on the above device, the three-dimensional computational fluid dynamics simulation includes two-phase flow numerical simulation.

[0136] Optionally, the number of geometric dimensions is at least one group, the number of target design solutions is at least one, and each geometric dimension corresponds to each target design solution one by one;

[0137] The device also includes:

[0138] The best design solution determination module is used to compare the target design solutions corresponding to at least one group of geometric dimensions, and determine the best design solution from the target design solutions corresponding to at least one group of geometric dimensions according to the comparison results.

[0139] Optionally, the device further comprises:

[0140] The engineering optimization scheme determination module is used to determine the engineering optimization scheme of the trickle bed reactor based on the target design scheme after determining the target design scheme of the trickle bed reactor according to the geometric dimensions, wherein the engineering optimization scheme includes at least one of catalyst particle size, hydrogen-to-oil ratio, inlet velocity distribution, inlet temperature, inlet pressure to bed temperature distribution, temperature difference, pressure drop, component distribution and conversion rate.

[0141] Optionally, the device further comprises:

[0142] A first meshing strategy determination module is used to perform meshing on the two-dimensional geometric model using a preset structural meshing scheme before performing a two-dimensional computational fluid dynamics simulation according to the two-dimensional geometric model and the inlet conditions to obtain a first simulation result, and determine a first meshing strategy according to the first meshing result;

[0143] The first simulation result obtaining module 330 includes:

[0144] The first simulation result obtaining submodule is used to perform a two-dimensional computational fluid dynamics simulation according to the two-dimensional geometric model, the first grid division strategy and the inlet condition to obtain the first simulation result.

[0145] The trickle bed reactor design device provided by the embodiment of the present invention determines the geometric dimensions of the trickle bed reactor to be designed through a two-dimensional geometric model establishment module, and establishes a two-dimensional geometric model of the trickle bed reactor based on the geometric dimensions, thereby realizing the establishment of the two-dimensional geometric model of the trickle bed reactor; obtains the associated material parameters of the trickle bed reactor through an inlet condition determination module, and determines the inlet conditions based on the geometric dimensions and the associated material parameters, thereby realizing the determination of the inlet conditions used for the two-dimensional computational fluid dynamics simulation requirements; performs a two-dimensional computational fluid dynamics simulation based on the two-dimensional geometric model and the inlet conditions through a first simulation result acquisition module, obtains a first simulation result, and realizes the simulation of the flow in the two-dimensional geometric model; determines the target design scheme of the trickle bed reactor based on the geometric dimensions through a target design scheme determination module when the first simulation result meets the preset first design requirement, thereby realizing the determination of an accurate target design scheme. The above-mentioned device obtains a first simulation result of the evaluation result of the trickle bed reactor corresponding to the geometric dimensions through a two-dimensional computational fluid dynamics simulation of the established two-dimensional geometric model. When the first simulation result meets the preset first design requirement, the target design scheme of the trickle bed reactor is determined according to the geometric dimensions, so that the target design scheme can meet the design requirements, thereby improving the accuracy of the design scheme of the trickle bed reactor.

[0146] The trickle bed reactor design device provided in the embodiment of the present invention can execute the trickle bed reactor design method provided in any embodiment of the present invention, and has the corresponding functional modules and beneficial effects of the execution method.

[0147] It is worth noting that in the embodiment of the above-mentioned trickle bed reactor design device, the various units and modules included are only divided according to functional logic, but are not limited to the above-mentioned division, as long as the corresponding functions can be achieved; in addition, the specific names of the functional units are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of the present invention.

[0148] Fig.24 A schematic diagram of the structure of an electronic device 10 that can be used to implement an embodiment of the present invention is shown. The electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices (such as helmets, glasses, watches, etc.) and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present invention described and / or required herein.

[0149] like Fig.24As shown, the electronic device 10 includes at least one processor 11, and a memory connected to the at least one processor 11, such as a read-only memory (ROM) 12, a random access memory (RAM) 13, etc., wherein the memory stores a computer program that can be executed by at least one processor, and the processor 11 can perform various appropriate actions and processes according to the computer program stored in the read-only memory (ROM) 12 or the computer program loaded from the storage unit 18 to the random access memory (RAM) 13. In the RAM 13, various programs and data required for the operation of the electronic device 10 can also be stored. The processor 11, the ROM 12, and the RAM 13 are connected to each other through a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

[0150] A number of components in the electronic device 10 are connected to the I / O interface 15, including: an input unit 16, such as a keyboard, a mouse, etc.; an output unit 17, such as various types of displays, speakers, etc.; a storage unit 18, such as a disk, an optical disk, etc.; and a communication unit 19, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 19 allows the electronic device 10 to exchange information / data with other devices through a computer network such as the Internet and / or various telecommunication networks.

[0151] The processor 11 may be a variety of general and / or special processing components with processing and computing capabilities. Some examples of the processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various special artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any appropriate processor, controller, microcontroller, etc. The processor 11 executes the various methods and processes described above, such as the trickle bed reactor design method.

[0152] In some embodiments, the trickle bed reactor design method may be implemented as a computer program, which is tangibly contained in a computer-readable storage medium, such as a storage unit 18. In some embodiments, part or all of the computer program may be loaded and / or installed on the electronic device 10 via the ROM 12 and / or the communication unit 19. When the computer program is loaded into the RAM 13 and executed by the processor 11, one or more steps of the trickle bed reactor design method described above may be performed. Alternatively, in other embodiments, the processor 11 may be configured to perform the trickle bed reactor design method in any other suitable manner (e.g., by means of firmware).

[0153] Various implementations of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), systems on chips (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various implementations can include: being implemented in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which can be a special purpose or general purpose programmable processor that can receive data and instructions from a storage system, at least one input device, and at least one output device, and transmit data and instructions to the storage system, the at least one input device, and the at least one output device.

[0154] Computer programs for implementing the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, so that when the computer program is executed by the processor, the functions / operations specified in the flow chart and / or block diagram are implemented. The computer program may be executed entirely on the machine, partially on the machine, partially on the machine as a stand-alone software package and partially on a remote machine, or entirely on a remote machine or server.

[0155] In the context of the present invention, a computer-readable storage medium may be a tangible medium that may contain or store a computer program for use by or in combination with an instruction execution system, device or equipment. A computer-readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices or equipment, or any suitable combination of the foregoing. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. A more specific example of a machine-readable storage medium may include an electrical connection based on one or more lines, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0156] To provide interaction with a user, the systems and techniques described herein may be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and a pointing device (e.g., a mouse or trackball) through which the user can provide input to the electronic device. Other types of devices may also be used to provide interaction with the user; for example, the feedback provided to the user may be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form (including acoustic input, voice input, or tactile input).

[0157] The systems and techniques described herein may be implemented in a computing system that includes backend components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes frontend components (e.g., a user computer with a graphical user interface or a web browser through which a user can interact with implementations of the systems and techniques described herein), or a computing system that includes any combination of such backend components, middleware components, or frontend components. The components of the system may be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: a local area network (LAN), a wide area network (WAN), a blockchain network, and the Internet.

[0158] A computing system may include a client and a server. The client and the server are generally remote from each other and usually interact through a communication network. The client and server relationship is generated by computer programs running on the corresponding computers and having a client-server relationship with each other. The server may be a cloud server, also known as a cloud computing server or cloud host, which is a host product in the cloud computing service system to solve the defects of difficult management and weak business scalability in traditional physical hosts and VPS services.

[0159] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0160] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A trickle bed reactor design method, characterized in that: include: Determining the geometric dimensions of the trickle bed reactor to be designed, and establishing a two-dimensional geometric model of the trickle bed reactor according to the geometric dimensions; Obtaining the associated material parameters of the trickle bed reactor, and determining the inlet conditions according to the geometric dimensions and the associated material parameters; Performing a two-dimensional computational fluid dynamics simulation according to the two-dimensional geometric model and the inlet condition to obtain a first simulation result; When the first simulation result meets the preset first design requirement, the target design scheme of the trickle bed reactor is determined according to the geometric dimensions.

2. The method according to claim 1, characterized in that Also includes: In the case where the first simulation result does not meet the preset first design requirement, the geometric dimensions are redetermined, and the step of obtaining the associated material parameters of the trickle bed reactor is repeated.

3. The method according to claim 1, characterized in that The step of determining the inlet conditions according to the geometric dimensions and the associated material parameters includes: Obtaining a target annual output and target annual working hours of the product of the trickle bed reactor; Determining the inlet liquid phase reactant molar flow rate of the trickle bed reactor according to the target annual output and the target annual working hours; Determining the inlet molar concentration of the liquid phase reactant, the inlet molar concentration of the gas phase reactant, and the inlet gas-liquid volume ratio of the trickle bed reactor according to the associated material parameters; Determining a bed inlet velocity of the trickle bed reactor according to the geometric dimensions, the inlet liquid-phase reactant molar flow rate, and the inlet molar concentration of the liquid-phase reactant; Determining the bed gas inlet flow rate of the trickle bed reactor according to the inlet gas-liquid volume ratio and the inlet liquid phase reactant molar flow rate; Determining a bed gas inlet velocity according to the gas phase reactant inlet molar concentration, the bed gas inlet flow rate and the geometric dimensions; At least one of the inlet liquid-phase reactant molar flow rate, the liquid-phase reactant inlet molar concentration, the gas-phase reactant inlet molar concentration, the inlet gas-liquid volume ratio, the bed inlet velocity, the bed gas inlet flow rate and the bed gas inlet velocity is used as an inlet condition.

4. The method according to claim 1, characterized in that: The two-dimensional computational fluid dynamics simulation includes at least one of a bed two-phase flow numerical simulation, a bed heat transfer numerical simulation and a bed reaction numerical simulation.

5. The method according to claim 1, characterized in that Determining the target design scheme of the trickle bed reactor according to the geometric dimensions includes: Establishing a three-dimensional geometric model of the trickle bed reactor according to the geometric dimensions and the preset design of the trickle bed reactor; Performing a three-dimensional computational fluid dynamics simulation according to the three-dimensional geometric model to obtain a second simulation result; When the second simulation result meets the preset second design requirement, the target design scheme of the trickle bed reactor is determined according to the preset design scheme and the geometric dimensions.

6. The method according to claim 5, characterized in that Also includes: When the second simulation result does not meet the preset second design requirement, the preset design scheme is adjusted, and the step of establishing the three-dimensional geometric model of the trickle bed reactor according to the geometric dimensions and the preset design scheme of the trickle bed reactor is repeated.

7. The method according to claim 5, characterized in that The three-dimensional computational fluid dynamics simulation includes a two-phase flow numerical simulation.

8. The method according to claim 1, characterized in that The number of the geometric dimensions is at least one group, the number of the target design solutions is at least one, and each of the geometric dimensions corresponds to each of the target design solutions one by one; The method further comprises: The target design solutions respectively corresponding to the at least one group of geometric dimensions are compared, and based on the comparison results, the best design solution is determined from the target design solutions respectively corresponding to the at least one group of geometric dimensions.

9. The method according to claim 1, characterized in that: After determining the target design scheme of the trickle bed reactor according to the geometric dimensions, the method further includes: Based on the target design scheme, an engineering optimization scheme for the trickle bed reactor is determined, wherein the engineering optimization scheme includes at least one of catalyst particle size, hydrogen-to-oil ratio, inlet velocity distribution, inlet temperature, inlet pressure to bed temperature distribution, temperature difference, pressure drop, component distribution and conversion rate.

10. The method according to claim 1, characterized in that Before performing a two-dimensional computational fluid dynamics simulation according to the two-dimensional geometric model and the inlet condition to obtain a first simulation result, the method further includes: Using a preset structural meshing scheme to mesh the two-dimensional geometric model, obtaining a first meshing result, and determining a first meshing strategy according to the first meshing result; The performing of a two-dimensional computational fluid dynamics simulation according to the two-dimensional geometric model and the inlet condition to obtain a first simulation result includes: The two-dimensional computational fluid dynamics simulation is performed according to the two-dimensional geometric model, the first grid division strategy and the inlet condition to obtain a first simulation result.

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