Design method and device of hydrogen precooling device, computer equipment and storage medium

Abstract

The invention discloses a design method and device of a hydrogen precooling device, computer equipment and a storage medium. The design method of the hydrogen precooling device comprises the steps that set values of target parameters of a precooling medium and hydrogen are obtained; the target parameters comprise mass flow, inlet temperature and outlet temperature and pressure; according to the given value of the target parameter, the structure parameters of the precooling medium flow channel and the hydrogen flow channel and the bottom wall surface temperatures of an inlet and an outlet are preset; according to the given value of the target parameter, the preset value of the flow channel structure parameter and the preset value of the bottom wall surface temperature, the bottom wall surface temperature calculated value and the flow channel pressure drop calculated value of the inlet and the outlet of the precooling medium flow channel and the hydrogen flow channel are determined; and according to the bottom wall surface temperature calculation value, the runner pressure drop calculation value and a preset threshold value, design parameters of the hydrogen precooling device are determined. By means of the design method, rapid design of the hydrogen precooling device can be achieved.

Description

Technical Field

[0001] The present application relates to the technical field of chemical plant design, and particularly to a design method and device for a hydrogen pre-cooling device, as well as a computer device and a storage medium. Background Art

[0002] With the gradual depletion of fossil fuel resources and the intensification of global climate change, it has become increasingly important to seek diversification of energy supply to reduce dependence on fossil fuels. Hydrogen produces almost no harmful substances during combustion or use, only producing water vapor, and is regarded as an ideal clean energy source. As a clean, carbon-free, flexible, efficient, and secondary energy source with rich application scenarios and an important industrial raw material, hydrogen has broad application scenarios.

[0003] The density of hydrogen is very low. To achieve large-scale storage, it needs to be compressed or liquefied. Moreover, hydrogen is relatively active at room temperature, and its chemical activity will significantly decrease after the temperature drops. Therefore, pre-cooling hydrogen before storage and transportation can effectively improve the safety and efficiency of storage and transportation.

[0004] The pre-cooling of hydrogen depends on the implementation through a hydrogen pre-cooling device. In different types of application scenarios, there are different requirements for the temperature, pressure, etc. of hydrogen. Therefore, it is crucial to provide a design method for a hydrogen pre-cooling device to meet the application needs of different scenarios. Summary of the Invention

[0005] Based on this, the present application provides a design method and device for a hydrogen pre-cooling device, as well as a computer device and a storage medium. The design method for the hydrogen pre-cooling device provided by the present application presets the structural parameters of the pre-cooling medium flow channel and the hydrogen flow channel, as well as the bottom wall surface temperature of the inlet and outlet, through the given values of the target parameters of the pre-cooling medium and hydrogen. Then, in combination with the above given values and preset values, the calculated values of the bottom wall surface temperature of the inlet and outlet of the pre-cooling medium flow channel and the hydrogen flow channel, as well as the flow channel pressure drop, are determined. By comparing the relationship between the calculated values and the preset threshold, it is judged whether the preset values are reasonable. If reasonable, they are used as design values; if not, the preset values are adjusted until the requirements are met. Through this design method, the flow channel design parameters of the hydrogen pre-cooling device can be quickly determined, realizing the rapid design of the hydrogen pre-cooling device.

[0006] The first aspect of the present application provides a design method for a hydrogen pre-cooling device, including the following steps:

[0007] Obtain the given values of the target parameters of the pre-cooling medium and hydrogen; the target parameters include mass flow rate, temperature and pressure at the inlet and outlet;

[0008] According to the given values of the target parameters of the precooling medium and hydrogen, preset the structural parameters of the precooling medium flow channel and the hydrogen flow channel, as well as the bottom wall surface temperatures of the inlets and outlets; the structural parameters include the equivalent diameter of the flow channel, the length of the flow channel, the thickness of the bottom wall surface of the flow channel, the total number of flow channels, and the type of flow channel plate material;

[0009] According to the given values of the target parameters of the precooling medium and hydrogen, the preset values of the structural parameters of the precooling medium flow channel and the hydrogen flow channel, and the preset values of the bottom wall surface temperatures of the inlets and outlets of the precooling medium flow channel and the hydrogen flow channel, determine the calculated values of the bottom wall surface temperatures of the inlets and outlets of the precooling medium flow channel and the hydrogen flow channel, as well as the calculated value of the flow channel pressure drop;

[0010] According to the calculated values of the bottom wall surface temperatures of the inlets and outlets of the precooling medium flow channel and the hydrogen flow channel, the calculated value of the flow channel pressure drop of the precooling medium flow channel and the hydrogen flow channel, and the preset threshold, determine the design values of the structural parameters of the precooling medium flow channel and the hydrogen flow channel, as well as the bottom wall surface temperatures of the inlets and outlets.

[0011] In some embodiments of the present application, the calculated values of the bottom wall surface temperatures of the inlets and outlets of the precooling medium flow channel and the hydrogen flow channel are determined by the following method:

[0012] According to the given value of the precooling medium mass flow rate, determine the heat absorption of the precooling medium; according to the given value of the hydrogen mass flow rate, determine the heat release of hydrogen; according to the given values of the inlet and outlet temperatures of the precooling medium and hydrogen, determine the logarithmic mean temperature difference of the hydrogen precooling device; according to the given values of the target parameters of the precooling medium and hydrogen, the preset values of the structural parameters of the precooling medium flow channel and the hydrogen flow channel, and the preset values of the bottom wall surface temperatures of the inlets and outlets of the precooling medium flow channel and the hydrogen flow channel, determine the heat transfer coefficient between hydrogen and the bottom wall surface of the flow channel at the inlets and outlets, the heat transfer coefficient between the precooling medium and the bottom wall surface of the flow channel at the inlets and outlets, and the total heat transfer coefficient of the hydrogen precooling device;

[0013] According to the heat absorption of the precooling medium, the logarithmic mean temperature difference of the hydrogen precooling device, and the total heat transfer coefficient of the hydrogen precooling device, determine the effective heat transfer area of the hydrogen precooling device;

[0014] According to the given values of the inlet and outlet temperatures of the precooling medium, the heat absorption of the precooling medium, the heat transfer coefficient between the precooling medium and the bottom wall surface of the flow channel at the inlets and outlets, and the effective heat transfer area of the hydrogen precooling device, determine the calculated values of the bottom wall surface temperatures of the inlets and outlets of the precooling medium flow channel; according to the given values of the inlet and outlet temperatures of hydrogen, the heat release of hydrogen, the heat transfer coefficient between hydrogen and the bottom wall surface of the flow channel at the inlets and outlets, and the effective heat transfer area of the hydrogen precooling device, determine the calculated values of the bottom wall surface temperatures of the inlets and outlets of the hydrogen flow channel.

[0015] In some embodiments of the present application, determining the heat transfer coefficient between hydrogen and the bottom wall surface of the flow channel at the inlet and outlet, the heat transfer coefficient between the precooling medium and the bottom wall surface of the flow channel at the inlet and outlet, and the total heat transfer coefficient of the hydrogen precooling device according to the given values of the target parameters of the precooling medium and hydrogen, the preset values of the structural parameters of the precooling medium flow channel and the hydrogen flow channel, and the preset values of the bottom wall surface temperatures of the inlets and outlets of the precooling medium flow channel and the hydrogen flow channel includes:

[0016] Determining the Nusselt numbers of the precooling medium and hydrogen at the inlets and outlets according to the given values of the target parameters of the precooling medium and hydrogen, the preset values of the structural parameters of the precooling medium flow channel and the hydrogen flow channel, and the preset values of the bottom wall surface temperatures of the inlets and outlets of the precooling medium flow channel and the hydrogen flow channel;

[0017] Determining the heat transfer coefficient between hydrogen and the bottom wall surface of the flow channel at the inlets and outlets and the heat transfer coefficient between the precooling medium and the bottom wall surface of the flow channel at the inlets and outlets according to the Nusselt numbers of the precooling medium and hydrogen at the inlets and outlets;

[0018] Determining the total heat transfer coefficient of the hydrogen precooling device according to the heat transfer coefficient between hydrogen and the bottom wall surface of the flow channel at the inlets and outlets, the heat transfer coefficient between the precooling medium and the bottom wall surface of the flow channel at the inlets and outlets, the thickness of the bottom wall surfaces of the precooling medium flow channel and the hydrogen flow channel, and the material types of the precooling medium flow channel plate and the hydrogen flow channel plate.

[0019] In some embodiments of the present application, the calculated values of the bottom wall surface temperatures of the inlets and outlets of the precooling medium flow channel and the hydrogen flow channel are determined by Equations 1 to 4:

[0020]

[0021] In Equation 1, is the calculated value of the bottom wall surface temperature at the inlet of the precooling medium flow channel; T 冷1 is the given value of the inlet temperature of the precooling medium; Q 冷 is the heat absorption of the precooling medium; A is the effective heat transfer area of the hydrogen precooling device; h 冷1 is the heat transfer coefficient between the precooling medium and the bottom wall surface of the flow channel at the inlet;

[0022] In Equation 2, is the calculated value of the bottom wall surface temperature at the outlet of the precooling medium flow channel; T 冷2 is the given value of the outlet temperature of the precooling medium; Q 冷 is the heat absorption of the precooling medium; A is the effective heat transfer area of the hydrogen precooling device; h 冷2 is the heat transfer coefficient between the precooling medium and the bottom wall surface of the flow channel at the outlet;

[0023] In Equation 3, is the calculated value of the temperature of the inlet bottom wall surface of the hydrogen flow channel; T 氢1 is the given value of the inlet temperature of hydrogen; Q 氢 is the heat release of hydrogen; A is the effective heat transfer area of the hydrogen pre-cooling device; h 氢1 is the heat transfer coefficient between hydrogen and the bottom wall surface of the flow channel at the inlet;

[0024] In Equation 4, is the calculated value of the temperature of the outlet bottom wall surface of the hydrogen flow channel; T 氢2 is the given value of the outlet temperature of hydrogen; Q 氢 is the heat release of hydrogen; A is the effective heat transfer area of the hydrogen pre-cooling device; h 冷2 is the heat transfer coefficient between hydrogen and the bottom wall surface of the flow channel at the outlet.

[0025] In some embodiments of the present application, the calculated values of the flow channel pressure drops of the pre-cooling medium flow channel and the hydrogen flow channel are determined by the following method:

[0026] According to the heat transfer coefficients between hydrogen and the bottom wall surface of the flow channel at the inlet and outlet, and the given values of the temperature and pressure at the inlet and outlet of hydrogen, determine the average temperature and average pressure of hydrogen flowing in the flow channel; according to the heat transfer coefficients between the pre-cooling medium and the bottom wall surface of the flow channel at the inlet and outlet, and the given values of the temperature and pressure at the inlet and outlet of hydrogen, determine the average temperature and average pressure of the pre-cooling medium flowing in the flow channel;

[0027] According to the given values of the target parameters of the pre-cooling medium and hydrogen, the average temperature and average pressure of the pre-cooling medium and hydrogen flowing in the flow channel, and the preset values of the structural parameters of the pre-cooling medium flow channel and the hydrogen flow channel, determine the average volume flow rate and average resistance coefficient of the pre-cooling medium and hydrogen flowing in the flow channel;

[0028] Determine the calculated values of the flow channel pressure drops of the pre-cooling medium flow channel and the hydrogen flow channel according to Equation 5 and Equation 6:

[0029]

[0030] In Equation 5, ΔP 冷 is the calculated value of the flow channel pressure drop of the pre-cooling medium flow channel; f 冷 is the average resistance coefficient of the pre-cooling medium flowing in the flow channel; ρ 冷 is the density corresponding to the average temperature and average pressure of the pre-cooling medium flowing in the flow channel; u 冷 is the average volume flow rate of the pre-cooling medium flowing in the flow channel; l 冷 is the preset value of the flow channel length of the pre-cooling medium flow channel; d 冷 is the preset value of the equivalent diameter of the flow channel of the pre-cooling medium flow channel;

[0031] In Equation 6, ΔP氢 is the calculated value of the pressure drop of the hydrogen flow channel; f 氢 is the average resistance coefficient of hydrogen flowing in the flow channel; ρ 冷 is the density corresponding to the average temperature and average pressure of hydrogen flowing in the flow channel; u 冷 is the average volume flow rate of hydrogen flowing in the flow channel; l 冷 is the preset value of the flow channel length of the hydrogen flow channel; d 冷 is the preset value of the equivalent diameter of the flow channel of the hydrogen flow channel.

[0032] In some embodiments of the present application, the preset threshold includes a first preset threshold and a second preset threshold. The first preset threshold is a value within a range of 1% difference from the preset values of the bottom wall surface temperatures at the inlets and outlets of the precooling medium flow channel and the hydrogen flow channel. The second preset threshold is the required value of the pressure drop of the precooling medium flow channel and the hydrogen flow channel.

[0033] In some embodiments of the present application, determining the structural parameters of the precooling medium flow channel and the hydrogen flow channel and the design values of the bottom wall surface temperatures at the inlets and outlets according to the calculated values of the bottom wall surface temperatures at the inlets and outlets of the precooling medium flow channel and the hydrogen flow channel, the calculated values of the pressure drops of the precooling medium flow channel and the hydrogen flow channel, and the preset threshold includes:

[0034] Judging the magnitudes of the calculated values of the bottom wall surface temperatures at the inlets and outlets of the precooling medium flow channel and the hydrogen flow channel and the first preset threshold, and the magnitudes of the calculated values of the pressure drops of the precooling medium flow channel and the hydrogen flow channel and the second preset threshold;

[0035] If the calculated values of the bottom wall surface temperatures at the inlets and outlets of the precooling medium flow channel and the hydrogen flow channel are within the range of the first preset threshold and the calculated values of the pressure drops of the precooling medium flow channel and the hydrogen flow channel ≤ the second preset threshold, then determine that the preset values of the structural parameters of the precooling medium flow channel and the hydrogen flow channel and the bottom wall surface temperatures at the inlets and outlets are the design values.

[0036] The second aspect of the present application provides a setting device for a hydrogen precooling device, including:

[0037] An acquisition module for acquiring the given values of the target parameters of the precooling medium and hydrogen; the target parameters include mass flow rate, temperatures and pressures at the inlets and outlets;

[0038] A preset module for presetting the structural parameters of the precooling medium flow channel and the hydrogen flow channel and the bottom wall surface temperatures at the inlets and outlets according to the given values of the target parameters of the precooling medium and hydrogen; the structural parameters include equivalent diameter of the flow channel, flow channel length, thickness of the bottom wall surface of the flow channel, total number of flow channels, and type of the flow channel plate material;

[0039] A calculation module, configured to determine the calculated values of the bottom wall surface temperatures at the inlets and outlets of the pre-cooling medium flow channel and the hydrogen flow channel and the calculated value of the flow channel pressure drop according to the given values of the target parameters of the pre-cooling medium and hydrogen, the preset values of the structural parameters of the pre-cooling medium flow channel and the hydrogen flow channel, and the preset values of the bottom wall surface temperatures at the inlets and outlets of the pre-cooling medium flow channel and the hydrogen flow channel.

[0040] A determination module, configured to determine the design values of the structural parameters of the pre-cooling medium flow channel and the hydrogen flow channel and the bottom wall surface temperatures at the inlets and outlets according to the calculated values of the bottom wall surface temperatures at the inlets and outlets of the pre-cooling medium flow channel and the hydrogen flow channel, the calculated value of the flow channel pressure drop of the pre-cooling medium flow channel and the hydrogen flow channel, and a preset threshold.

[0041] A third aspect of the present application provides a computer device, including: a processor, and a memory communicatively connected to the processor;

[0042] The memory stores computer-executable instructions;

[0043] The processor executes the computer-executable instructions stored in the memory to implement the design method of the hydrogen pre-cooling device as described in the first aspect of the present application.

[0044] A fourth aspect of the present application provides a computer-readable storage medium, in which computer-executable instructions are stored, and when the computer-executable instructions are executed, the computer is enabled to execute the design method of the hydrogen pre-cooling device as described in the first aspect of the present application.

[0045] The design method of the hydrogen pre-cooling device provided by the present application presets the structural parameters of the pre-cooling medium flow channel and the hydrogen flow channel and the bottom wall surface temperatures at the inlets and outlets through the given values of the target parameters of the pre-cooling medium and hydrogen, and then determines the calculated values of the bottom wall surface temperatures at the inlets and outlets of the pre-cooling medium flow channel and the hydrogen flow channel and the calculated value of the flow channel pressure drop in combination with the above given values and preset values. By comparing the relationship between the calculated values and the preset threshold, it is judged whether the preset values are reasonable. If reasonable, they are used as the design values; if not, the preset values are adjusted until the requirements are met. Through this design method, the flow channel design parameters of the hydrogen pre-cooling device can be quickly determined, and the rapid design of the hydrogen pre-cooling device can be realized. This method is scientific and efficient, and has guiding significance for the design, operation and optimization of hydrogen pre-cooling devices, especially high-pressure hydrogen pre-cooling devices. Description of the Drawings

[0046] To more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creative efforts.

[0047] Figure 1 The side view of the hydrogen pre-cooling device in the embodiment of the present application;

[0048] Figure 2 is Figure 1 The top view of the hydrogen pre-cooling device shown;

[0049] Figure 3 is Figure 1 The structural schematic diagram of the hydrogen pre-cooling device shown in the A-A cross-section;

[0050] Figure 4 The schematic flow diagram of the design method of the hydrogen pre-cooling device provided by the embodiment of the present application;

[0051] Figure 5 A structural schematic diagram of the flow channel size of the hydrogen pre-cooling device in the embodiment of the present application;

[0052] Figure 6 Another structural schematic diagram of the flow channel size of the hydrogen pre-cooling device in the embodiment of the present application;

[0053] Figure 7 The structural schematic diagram of the pre-cooling medium flow channel plate of the hydrogen pre-cooling device in the embodiment of the present application;

[0054] Figure 8 The structural schematic diagram of the hydrogen flow channel plate of the hydrogen pre-cooling device in the embodiment of the present application;

[0055] Figure 9 The schematic diagram of the design device of the hydrogen pre-cooling device provided by the embodiment of the present application;

[0056] Figure 10 The schematic diagram of the computer device provided by the embodiment of the present application.

[0057] Explanation of reference numerals:

[0058] 100: Hydrogen pre-cooling device; 110: Hydrogen flow channel plate; 120: Pre-cooling medium flow channel plate; 200: Pre-cooling medium inlet; 300: Hydrogen inlet; 400: Pre-cooling medium outlet; 500: Hydrogen outlet; 10: Design device of the hydrogen pre-cooling device; 11: Acquisition module; 12: Preset module; 13: Calculation module; 14: Determination module; 20: Computer device; 21: Processor; 22: Memory. Detailed implementation manners

[0059] In the description of the present application, "several" means more than one, "multiple" means more than two, and "greater than", "less than", "exceeding", etc. are understood not to include the recited number, while "above", "below", "within", etc. are understood to include the recited number. If "first" and "second" are described, they are only used to distinguish technical features and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features or implicitly specifying the sequence of the indicated technical features.

[0060] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this invention belongs. The terms used in the description of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0061] Unless otherwise specified, in the present application, each reaction step can be carried out in the order described in the text or not in the order described in the text. For example, other steps can be included between each reaction step, and the order of the reaction steps can also be appropriately adjusted. This can be determined by those skilled in the art based on common knowledge and experience. Preferably, the reaction method in this embodiment is carried out in sequence.

[0062] Unless otherwise specified, the same symbols appearing in different formulas in the present application represent the same definitions. The definitions are described when the symbols first appear and will not be repeated when they appear subsequently.

[0063] Figure 1 is a side view of the hydrogen pre-cooling device in the embodiment of the present application, Figure 2 is Figure 1 a top view of the hydrogen pre-cooling device shown, Figure 3 is Figure 1 a schematic structural view of the hydrogen pre-cooling device shown in the A-A cross-section. Please refer to Figures 1 to 3 , the hydrogen pre-cooling device 100 in the embodiment of the present application includes alternately arranged hydrogen flow channel plates 110 and pre-cooling medium flow channel plates 120, such that the upper and lower layers of each hydrogen flow channel plate 110 are both pre-cooling medium flow channel plates 120, and the upper and lower layers of each pre-cooling medium flow channel plate 120 are both hydrogen flow channel plates 110. Among them, the hydrogen flow channel is located above the hydrogen flow channel plate 110, and the pre-cooling medium flow channel is located above the pre-cooling medium flow channel plate 120. When the hydrogen pre-cooling device 100 is operating, the pre-cooling medium enters from the pre-cooling medium inlet 200, and the hydrogen to be pre-cooled enters from the hydrogen inlet 300. The two fluids of the pre-cooling medium and hydrogen are separated by the flow channel plates and flow through the pre-cooling medium flow channel and the hydrogen flow channel respectively, and finally flow out through the pre-cooling medium outlet 400 and the hydrogen outlet 500 respectively. The pre-cooling medium and hydrogen exchange heat during the flow process to achieve the pre-cooling of hydrogen.

[0064] The size and structure of the precooling medium flow channel and hydrogen flow channel in the hydrogen precooling device, as well as the bottom wall temperature of the inlet and outlet, have an important influence on the hydrogen precooling efficiency and are important factors in the design process of the hydrogen precooling device. Therefore, how to determine the above key parameters is the key to the design of the hydrogen precooling device.

[0065] Based on this, the first aspect of the present application provides a design method for a hydrogen precooling device 100. Figure 4 For a schematic diagram of the design method of the hydrogen precooling device provided in the embodiment of the present application, please refer to Figure 4 The design method of the hydrogen precooling device of the present application comprises the following steps:

[0066] S101: Obtaining given values ​​of target parameters of the precooling medium and hydrogen; the target parameters include mass flow, inlet and outlet temperatures and pressures;

[0067] S102: according to the given values ​​of the target parameters of the precooling medium and hydrogen, the structural parameters of the precooling medium flow channel and the hydrogen flow channel and the bottom wall temperature of the inlet and the outlet are preset; the structural parameters include the equivalent diameter of the flow channel, the length of the flow channel, the thickness of the bottom wall of the flow channel, the total number of flow channels and the type of flow channel plate material;

[0068] S103: Determine calculated values ​​of the bottom wall temperatures at the inlet and outlet of the precooling medium flow channel and the hydrogen flow channel and calculated values ​​of the flow channel pressure drop according to given values ​​of target parameters of the precooling medium and hydrogen, preset values ​​of structural parameters of the precooling medium flow channel and the hydrogen flow channel, and preset values ​​of the bottom wall temperatures at the inlet and outlet of the precooling medium flow channel and the hydrogen flow channel;

[0069] S104: Determine the structural parameters of the precooling medium flow channel and the hydrogen flow channel and the design values ​​of the bottom wall temperature of the inlet and outlet of the precooling medium flow channel and the hydrogen flow channel according to the calculated values ​​of the bottom wall temperature of the inlet and outlet of the precooling medium flow channel and the hydrogen flow channel, the calculated values ​​of the flow channel pressure drop of the precooling medium flow channel and the hydrogen flow channel, and a preset threshold value.

[0070] In step S101, obtaining the given values ​​of the target parameters of the precooling medium and hydrogen means presetting the values ​​of the target parameters, for example, the inlet temperature of hydrogen can be given as 520K, the pressure is 20MPa, the outlet temperature is 260K, the pressure is 19.98MPa, and the mass flow rate is 16.67g / s; the inlet temperature of the precooling medium can be given as 230K, the pressure is 20MPa, the outlet temperature is 420MPa, the outlet pressure is 19.96MPa, and the mass flow rate is 69.44g / s. Then, the given values ​​of the target parameters are used as the design targets, and the hydrogen precooling device required under the given values ​​is designed.

[0071] It is understandable that the type of the precooling medium also belongs to the pre-given target parameters, including but not limited to one or more of liquid ammonia, liquid nitrogen, liquid helium, liquid carbon dioxide, and a mixture of water and ethylene glycol.

[0072] In step S102, for the structural parameters of the precooling medium flow channel and the hydrogen flow channel, as well as the bottom wall surface temperatures of the inlet and outlet, the required heat transfer amount can be determined according to the given values of the target parameters of the precooling medium and hydrogen, and then preset in combination with the principles of heat transfer.

[0073] For the shapes of the precooling medium flow channel and the hydrogen flow channel, they can be preset to common shapes such as circular, square, rectangular, serpentine, etc., and the flow channel shape can be adjusted by controlling the structure of the flow channel plate. For example, by making the flow channel plate have a semi-circular groove, a semi-circular flow channel can be obtained, and by making the flow channel plate have a rectangular groove, a rectangular flow channel can be obtained. Figure 5 and Figure 6 are respectively schematic diagrams of the flow channel size structures of two different types of hydrogen precooling devices in the embodiments of the present application. Figure 5 The shown flow channel is a rectangular flow channel. Figure 6 The shown flow channel is a semi-circular flow channel. Figure 5 and Figure 6 In, the position where each dotted line is located represents a flow channel, and two adjacent flow channels are separated by ribs. Figure 5 In, the flow channel width is represented by W, the flow channel height is represented by H, and as long as the width W and height H of the rectangular flow channel are determined, the flow channel equivalent diameter d can be calculated according to the formula 2WH / (W + H). Figure 6 In, the flow channel diameter is the flow channel equivalent diameter d. Figure 5 and Figure 6 In, the thickness of the bottom wall surface of the flow channel is represented by δ. The flow channel sizes of the hydrogen flow channel and the precooling medium can both be preset with reference to Figure 5 and Figure 6 for presetting.

[0074] In addition to the flow channel plates with regular shapes listed above, special-shaped flow channel plates can also be set, including but not limited to corrugated or Z-shaped flow channel plates (such as Figure 7 and Figure 8 shown), and the special-shaped flow channel plates can increase the flow channel length.

[0075] For the flow channel equivalent diameter, taking a circular flow channel as an example, it satisfies the relationship that the mass flow rate is equal to the product of the mass velocity and the flow channel cross-sectional area. The mass flow rate is given, and the mass velocity also needs to be controlled within a certain range to ensure good heat transfer and flow performance and prevent excessive pressure loss or unstable flow. Therefore, the flow channel equivalent diameter can be preset based on this. For the flow channel length and the total number of flow channels, they can also be preset according to similar principles, which will not be elaborated here.

[0076] For the material type of the flow channel plate, materials with good thermal conductivity, corrosion resistance, and mechanical strength can be preset according to factors such as the properties of hydrogen and the precooling medium, the target temperature and pressure of precooling, etc., such as 304 stainless steel or 316L stainless steel, etc.

[0077] For the bottom wall surface temperature of the flow channel inlet and outlet, it can be preset by combining the basic principles of heat transfer. For example, according to the second law of thermodynamics, heat always transfers from a high-temperature object to a low-temperature object, and the driving force for heat transfer is the temperature difference. To achieve the precooling of hydrogen, the bottom wall surface temperature of the hydrogen flow channel inlet must be lower than the initial temperature of hydrogen (i.e., the temperature of hydrogen at the inlet). Based on the given precooling medium and the temperature values of the inlet and outlet of hydrogen, and combining the logarithmic mean temperature difference calculation formula in the heat transfer process, the required temperature difference between the bottom wall surface of the flow channel inlet and outlet and the corresponding fluid (precooling medium or hydrogen) can be initially estimated, and thus the bottom wall surface temperature of the flow channel inlet and outlet can be preset.

[0078] It should be noted that in this application, the hydrogen inlet and the hydrogen flow channel inlet are the same port. Similarly, the hydrogen outlet and the hydrogen flow channel outlet are the same port, the precooling medium inlet and the hydrogen flow channel inlet are the same port, and the precooling medium outlet and the precooling medium flow channel outlet are the same port.

[0079] For the thickness of the bottom wall surface of the flow channel, the thickness of the bottom wall surface of the flow channel that meets the heat transfer requirements is preset by combining factors such as the thermal conductivity, processing difficulty, flow channel strength requirements, and welding process.

[0080] In step S103, according to the given values of the target parameters of the precooling medium and hydrogen, the preset values of the structural parameters of the precooling medium flow channel and the hydrogen flow channel, and the preset values of the bottom wall surface temperature of the inlet and outlet of the precooling medium flow channel and the hydrogen flow channel, the kinematic viscosity, Prandtl number, Reynolds number, Nusselt number, etc. of the precooling medium and hydrogen flowing in the flow channel can be determined. Furthermore, the heat transfer coefficient between the corresponding fluid and the bottom wall surface of the flow channel can be determined. Combining the fouling thermal resistance of the precooling medium and hydrogen in the flow channel plate of a specific material, the total heat transfer coefficient of the hydrogen precooling device can be obtained. Then, the effective heat transfer area of the hydrogen precooling medium can be determined. Combining the above values, the calculated values of the bottom wall surface temperature of the inlet and outlet of the precooling medium flow channel and the hydrogen flow channel and the calculated value of the flow channel pressure drop can be determined.

[0081] In step S104, the calculated values of the bottom wall surface temperatures at the inlets and outlets of the precooling medium flow channel and the hydrogen flow channel, and the calculated values of the flow channel pressure drops of the precooling medium flow channel and the hydrogen flow channel are compared with the preset thresholds. If the calculated values meet the requirements of the preset thresholds, the preset values of the structural parameters of the precooling medium flow channel and the hydrogen flow channel and the preset values of the bottom wall surface temperatures at the inlets and outlets of the precooling medium flow channel and the hydrogen flow channel in step S102 are determined as the final design values. If the requirements of the preset thresholds are not met, the above preset values are adjusted and recalculated iteratively until the requirements are met.

[0082] The design method of the hydrogen precooling device provided in this application presets the structural parameters of the precooling medium flow channel and the hydrogen flow channel and the bottom wall surface temperatures at the inlets and outlets through the given values of the target parameters of the precooling medium and hydrogen. Then, based on the above given values and preset values, the calculated values of the bottom wall surface temperatures at the inlets and outlets of the precooling medium flow channel and the hydrogen flow channel and the calculated values of the flow channel pressure drops are determined. By comparing the relationship between the calculated values and the preset thresholds, it is judged whether the preset values are reasonable. If they are reasonable, they are used as the design values. If they are not reasonable, the preset values are adjusted until the requirements are met. Through this design method, the flow channel design parameters of the hydrogen precooling device can be quickly determined, realizing the rapid design of the hydrogen precooling device. This method is scientific and efficient, and has guiding significance for the design, operation and optimization of hydrogen precooling devices, especially high-pressure hydrogen precooling devices.

[0083] In some embodiments of the present application, in step S103, the calculated values of the bottom wall surface temperatures at the inlets and outlets of the precooling medium flow channel and the hydrogen flow channel are determined by the following method:

[0084] S11: Determine the heat absorption of the precooling medium according to the given value of the precooling medium mass flow rate; determine the heat release of hydrogen according to the given value of the hydrogen mass flow rate; determine the logarithmic mean temperature difference of the hydrogen precooling device according to the given values of the inlet and outlet temperatures of the precooling medium and hydrogen; determine the heat transfer coefficients between hydrogen and the bottom wall surface of the flow channel at the inlets and outlets, the heat transfer coefficients between the precooling medium and the bottom wall surface of the flow channel at the inlets and outlets, and the total heat transfer coefficient of the hydrogen precooling device according to the given values of the target parameters of the precooling medium and hydrogen, the preset values of the structural parameters of the precooling medium flow channel and the hydrogen flow channel, and the preset values of the bottom wall surface temperatures at the inlets and outlets of the precooling medium flow channel and the hydrogen flow channel;

[0085] S12: Determine the effective heat transfer area of the hydrogen precooling device according to the heat absorption of the precooling medium, the logarithmic mean temperature difference of the hydrogen precooling device and the total heat transfer coefficient of the hydrogen precooling device;

[0086] S13: Determine the calculated bottom wall surface temperatures at the inlets and outlets of the pre-cooling medium flow channels based on the temperature set values of the pre-cooling medium at the inlets and outlets, the heat absorption of the pre-cooling medium, the heat transfer coefficients between the pre-cooling medium at the inlets and outlets and the bottom wall surface of the flow channels, and the effective heat transfer area of the hydrogen pre-cooling device; determine the calculated bottom wall surface temperatures at the inlets and outlets of the hydrogen flow channels based on the temperature set values of the hydrogen at the inlets and outlets, the heat release of the hydrogen, the heat transfer coefficients between the hydrogen at the inlets and outlets and the bottom wall surface of the flow channels, and the effective heat transfer area of the hydrogen pre-cooling device.

[0087] In S11, the heat release of the hydrogen and the heat absorption of the pre-cooling medium can be calculated respectively according to Equations 7 and 8:

[0088] Q 氢 = q 氢 (H 氢1 - H 氢2 ) Equation 7

[0089] Q 冷 = q 冷 (H 冷2 - H 冷1 ) Equation 8

[0090] In Equation 7, Q 氢 is the heat release of the hydrogen; q 氢 is the given value of the hydrogen mass flow rate; H 氢1 is the enthalpy value at the hydrogen inlet; H 氢2 is the enthalpy value at the hydrogen outlet.

[0091] In Equation 8, Q 冷 is the heat absorption of the pre-cooling medium; q 冷 is the given value of the pre-cooling medium mass flow rate; H 冷1 is the enthalpy value at the pre-cooling medium inlet; H 冷2 is the enthalpy value at the pre-cooling medium outlet.

[0092] In Equations 7 and 8, the enthalpy values at the inlets and outlets of the hydrogen and the pre-cooling medium can be obtained by querying the corresponding enthalpy values in the thermophysical property database based on the temperatures and pressures at the inlets and outlets.

[0093] In S11, the logarithmic mean temperature difference can be determined by combining the flow states of the pre-cooling medium and the hydrogen in the flow channels and the temperature set values at the inlets and outlets. For example, when the pre-cooling medium and the hydrogen flow countercurrently, the logarithmic mean temperature difference can be calculated by combining Equations 9 to 11:

[0094]

[0095] ΔT max = max(T 氢1 - T 冷2 , T 氢2 - T冷1 ) Equation 10

[0096] ΔT min = min(T 氢1 - T 冷2 , T 氢2 - T 冷1 ) Equation 11

[0097] In Equation 9, ΔT is the logarithmic mean temperature difference; ΔT max and ΔT min are respectively calculated through Equation 10 and Equation 11.

[0098] In Equation 10 and Equation 11, T 氢1 is the temperature set value at the hydrogen inlet; T 氢2 is the temperature set value at the hydrogen outlet; T 冷1 is the temperature set value at the pre-cooling medium inlet; T 冷2 is the temperature set value at the pre-cooling medium outlet.

[0099] In some embodiments of the present application, in S11, according to the set values of the target parameters of the pre-cooling medium and hydrogen, the preset structural parameter values of the pre-cooling medium flow channel and the hydrogen flow channel, and the preset bottom wall surface temperature values of the inlets and outlets of the pre-cooling medium flow channel and the hydrogen flow channel, determine the heat transfer coefficients between hydrogen and the bottom wall surface of the flow channel at the inlets and outlets, the heat transfer coefficients between the pre-cooling medium and the bottom wall surface of the flow channel at the inlets and outlets, and the total heat transfer coefficient of the hydrogen pre-cooling device, including:

[0100] S1: According to the set values of the target parameters of the pre-cooling medium and hydrogen, the preset structural parameter values of the pre-cooling medium flow channel and the hydrogen flow channel, and the preset bottom wall surface temperature values of the inlets and outlets of the pre-cooling medium flow channel and the hydrogen flow channel, determine the Nusselt numbers of the pre-cooling medium and hydrogen at the inlets and outlets;

[0101] S2: According to the Nusselt numbers of the pre-cooling medium and hydrogen at the inlets and outlets, determine the heat transfer coefficients between hydrogen and the bottom wall surface of the flow channel at the inlets and outlets and the heat transfer coefficients between the pre-cooling medium and the bottom wall surface of the flow channel at the inlets and outlets;

[0102] S3: According to the heat transfer coefficients between hydrogen and the bottom wall surface of the flow channel at the inlets and outlets, the heat transfer coefficients between the pre-cooling medium and the bottom wall surface of the flow channel at the inlets and outlets, the thickness of the bottom wall surfaces of the pre-cooling medium flow channel and the hydrogen flow channel, and the material types of the pre-cooling medium flow channel plate and the hydrogen flow channel plate, determine the total heat transfer coefficient of the hydrogen pre-cooling device.

[0103] In S1, the Nusselt numbers of the pre-cooling medium and hydrogen at the inlets and outlets can be respectively determined through Equations 12 to 15:

[0104]

[0105] In Equation 12, is the Nusselt number of the precooling medium at the inlet; d 冷 is the equivalent diameter of the flow channel of the precooling medium; l 冷 is the flow channel length of the precooling medium flow channel; is the Reynolds number of the precooling medium at the inlet, which can be calculated by Equation 16, is the resistance coefficient of the precooling medium at the inlet, which can be obtained through determined; is the Prandtl number of the precooling medium at the given inlet temperature and pressure, is the Prandtl number at the bottom wall temperature and pressure at the preset inlet of the precooling medium flow channel, and can be obtained by querying the physical property parameter database.

[0106] In Equation 13, is the Nusselt number of the precooling medium at the outlet; is the Reynolds number of the precooling medium at the outlet, which can be calculated by Equation 17, is the resistance coefficient of the precooling medium at the outlet, which can be obtained through determined; is the Prandtl number of the precooling medium at the given outlet temperature and pressure, is the Prandtl number at the bottom wall temperature and pressure at the preset outlet of the precooling medium flow channel, and can be obtained by querying the physical property parameter database.

[0107] In Equation 14, is the Nusselt number of hydrogen at the inlet; d 氢 is the equivalent diameter of the flow channel of the hydrogen flow channel; l 氢 is the flow channel length of the hydrogen flow channel; is the Reynolds number of hydrogen at the inlet, which can be calculated by Equation 18, is the resistance coefficient of hydrogen at the inlet, which can be obtained through determined; is the Prandtl number of hydrogen at the given inlet temperature and pressure, is the Prandtl number at the bottom wall temperature and pressure at the preset inlet of the hydrogen flow channel, and can be obtained by querying the physical property parameter database.

[0108] In Equation 15, is the Nusselt number of hydrogen at the outlet; is the Reynolds number of hydrogen at the outlet, which can be calculated by Equation 19, is the resistance coefficient of hydrogen at the outlet, which can be determined by ; is the Prandtl number of hydrogen at the given outlet temperature and pressure, is the Prandtl number at the bottom wall temperature and pressure at the outlet of the preset hydrogen flow channel, and can be obtained by querying the physical property parameter database.

[0109] It should be noted that the pressure of the bottom wall of the flow channel is consistent with that of the fluid in the same radial direction. Therefore, the bottom wall pressures of the pre-cooling medium flow channel and the hydrogen flow channel required in the above calculations of Equation 12 - Equation 15 are consistent with the pressures of the given pre-cooling medium and hydrogen at the inlet and outlet.

[0110]

[0111] In Equation 16, is the volume flow rate of the pre-cooling medium at the inlet, which can be calculated by Equation 20; is the kinematic viscosity of the pre-cooling medium at the inlet, which is obtained by querying the thermophysical property database in combination with the given temperature and pressure values at the inlet of the pre-cooling medium;

[0112] In Equation 17, is the volume flow rate of the pre-cooling medium at the outlet, which can be calculated by Equation 21; is the kinematic viscosity of the pre-cooling medium at the outlet, which is obtained by querying the thermophysical property database in combination with the given temperature and pressure values at the outlet of the pre-cooling medium;

[0113] In Equation 18, is the volume flow rate of hydrogen at the inlet, which can be calculated by Equation 22; is the kinematic viscosity of hydrogen at the inlet, which is obtained by querying the thermophysical property database in combination with the given temperature and pressure values at the inlet of hydrogen;

[0114] In Equation 19, is the volume flow rate of hydrogen at the outlet, which can be calculated by Equation 23; is the kinematic viscosity of hydrogen at the outlet, which is obtained by querying the thermophysical property database in combination with the given temperature and pressure values at the outlet of hydrogen.

[0115]

[0116]

[0117] In Equation 20, q 冷 is the given value of the mass flow rate of the pre-cooling medium; n 冷 is the total number of flow channels of the pre-cooling medium flow channel; is the density corresponding to the given values of the inlet temperature and pressure of the precooling medium, which can be obtained by querying the thermal property parameter database;

[0118] In Equation 21, is the density corresponding to the given values of the outlet temperature and pressure of the precooling medium, which can be obtained by querying the thermal property parameter database;

[0119] In Equation 22, q 氢 is the given value of the mass flow rate of hydrogen; n 氢 is the total number of flow channels in the hydrogen flow channel; is the density corresponding to the given values of the inlet temperature and pressure of hydrogen, which can be obtained by querying the thermal property parameter database;

[0120] In Equation 23, is the density corresponding to the given values of the outlet temperature and pressure of hydrogen, which can be obtained by querying the thermal property parameter database.

[0121] According to the Reynolds number, the flow states of hydrogen and the precooling medium can be judged as laminar flow, turbulent flow or the transitional state between the two, and then the corresponding calculation methods of the resistance coefficient are determined according to the different flow states. Usually, due to the relatively high pressure, both hydrogen and the precooling medium are in the turbulent state, and the resistance coefficients at the inlet and outlet are calculated respectively through Equations 24 to 27:

[0122]

[0123] In Equations 24 to 27, is the resistance coefficient of the precooling medium at the inlet, is the resistance coefficient of the precooling medium at the outlet, is the resistance coefficient of hydrogen at the inlet, is the resistance coefficient of hydrogen at the outlet.

[0124] In S2, the heat transfer coefficients between hydrogen and the bottom wall surface of the flow channel at the inlet and outlet and the heat transfer coefficients between the precooling medium and the bottom wall surface of the flow channel at the inlet and outlet can be determined respectively through Equations 28 to 31:

[0125]

[0126]

[0127] In Equation 28, is the heat transfer coefficient between the precooling medium and the bottom wall surface of the flow channel at the inlet; is the thermal conductivity of the precooling medium at the inlet, which is obtained by querying the thermal property database in combination with the given values of the inlet temperature and pressure of the precooling medium;

[0128] In Equation 29, is the heat transfer coefficient between the precooling medium and the bottom wall surface of the flow channel at the outlet; is the thermal conductivity of the precooling medium at the outlet, which is obtained by querying the thermophysical property database in combination with the given values of the outlet temperature and pressure of the precooling medium;

[0129] In Equation 30, is the heat transfer coefficient between hydrogen and the bottom wall surface of the flow channel at the inlet; is the thermal conductivity of hydrogen at the inlet, which is obtained by querying the thermophysical property database in combination with the given values of the inlet temperature and pressure of hydrogen;

[0130] In Equation 31, is the heat transfer coefficient between hydrogen and the bottom wall surface of the flow channel at the outlet; is the thermal conductivity of hydrogen at the outlet, which is obtained by querying the thermophysical property database in combination with the given values of the outlet temperature and pressure of hydrogen.

[0131] In S3, the total heat transfer coefficient of the hydrogen precooling device can be calculated according to Equation 32:

[0132]

[0133] In Equation 32, h 总 is the total heat transfer coefficient of the hydrogen precooling device; h 冷 is the average heat transfer coefficient between the precooling medium and the bottom wall surface of the flow channel; R 冷 is the fouling thermal resistance between the precooling medium and the bottom wall surface of the flow channel; R 氢 is the fouling thermal resistance between hydrogen and the bottom wall surface of the flow channel; δ 冷 is the thickness of the bottom wall surface of the precooling medium flow channel; is the thermal conductivity of the bottom wall surface of the precooling medium flow channel, which can be obtained by querying the metal material property manual in combination with the material type of the precooling medium flow channel plate and the average temperature of the bottom wall surface of the precooling medium flow channel; h 氢 is the average heat transfer coefficient between hydrogen and the bottom wall surface of the flow channel; δ 氢 is the thickness of the bottom wall surface of the hydrogen flow channel; is the thermal conductivity of the bottom wall surface of the hydrogen flow channel, which can be obtained by querying the metal material property manual in combination with the material type of the hydrogen flow channel plate and the average temperature of the bottom wall surface of the hydrogen flow channel.

[0134] R 冷 and R 氢 can be obtained by querying professional books (for example: Yang Shanrang, Xu Zhiming, Sun Lingfang. Fouling and Countermeasures of Heat Exchanger Equipment [M]. 2nd Edition. Beijing: Science Press, 2004: 1-48, 578-582.) or databases.

[0135] For h 冷 , if and If the difference between the two is within 10%, it indicates that the flow state distribution of the precooling medium in the flow channel is relatively uniform, without obvious local high heat or complex flow separation. At this time, the average value of and can be taken as the value of h 冷 ; if and the difference between the two exceeds 10%, it indicates that the flow state of the precooling medium in the flow channel is relatively complex. At this time, it is necessary to evenly divide the flow channel into multiple units for segmented calculation according to the given values of the inlet and outlet temperatures of the precooling medium and the preset values of the inlet and outlet temperatures of the bottom wall surface of the flow channel. For example, it is divided into the first unit, the second unit, and the third unit. Each unit includes an inlet and an outlet. The outlet of the first unit is the inlet of the second unit, and the outlet of the second unit is the inlet of the third unit. Calculate the heat transfer coefficient between the precooling medium and the bottom wall surface of the flow channel at the inlet and outlet of each unit according to the temperature of the precooling medium and the temperature of the bottom wall surface of the flow channel at the inlet and outlet of each unit. If the difference between the two is within 10%, it indicates that the division is reasonable, and the average value of the heat transfer coefficients between the precooling medium and the bottom wall surface of the flow channel at the inlets and outlets of all units is taken as the average heat transfer coefficient h 冷 between the precooling medium and the bottom wall surface of the flow channel. If the difference between the two still exceeds 10%, the unit is continuously divided until the difference between the heat transfer coefficients between the precooling medium and the bottom wall surface of the flow channel at the inlets and outlets of each unit is within 10%.

[0136] Similarly, for h 氢 , it is also calculated by referring to the above method of h 冷 , which will not be elaborated here.

[0137] For the average temperature and average pressure of the bottom wall surface of the precooling medium flow channel, if and the difference between the two is within 10%, the average temperature of the bottom wall surface of the precooling medium is the average value of the preset values of the bottom wall surface temperatures at the inlet and outlet of the flow channel, and the average pressure of the bottom wall surface of the precooling medium is the average value of the bottom wall surface pressures at the inlet and outlet of the flow channel; otherwise, according to the above segmented method, the precooling medium flow channel is divided into multiple units with a difference in heat transfer coefficient within 10% at the inlets and outlets of each unit, and then the average value of the bottom wall surface temperatures of the inlets and outlets of all units is taken as the average temperature of the bottom wall surface of the precooling medium flow channel, and the average value of the bottom wall surface pressures of the inlets and outlets of the unit is the average pressure of the bottom wall surface of the precooling medium flow channel.

[0138] For the average temperature and average pressure of the bottom wall surface of the hydrogen flow channel, it also refers to the calculation method of the average temperature and average pressure of the bottom wall surface of the precooling medium flow channel, which will not be elaborated here.

[0139] In some embodiments of the present application, in S12, after separately calculating the heat absorption Q of the precooling medium 冷, the logarithmic mean temperature difference ΔT and the overall heat transfer coefficient h 总 After that, the heat transfer area A of the hydrogen pre-cooling device can be determined according to Equation 33:

[0140]

[0141] In some embodiments of the present application, in S13, the calculated values of the bottom wall surface temperatures at the inlets and outlets of the pre-cooling medium flow channel and the hydrogen flow channel are determined by Equations 1 to 4:

[0142]

[0143] In Equations 1 to 4, is the calculated value of the bottom wall surface temperature at the inlet of the pre-cooling medium flow channel; T 冷1 is the given value of the inlet temperature of the pre-cooling medium; is the calculated value of the bottom wall surface temperature at the outlet of the pre-cooling medium flow channel; T 冷2 is the given value of the outlet temperature of the pre-cooling medium; is the calculated value of the bottom wall surface temperature at the inlet of the hydrogen flow channel; T 氢1 is the given value of the inlet temperature of hydrogen; is the calculated value of the bottom wall surface temperature at the outlet of the hydrogen flow channel; T 氢2 is the given value of the outlet temperature of hydrogen.

[0144] In some embodiments of the present application, in S103, the calculated values of the flow channel pressure drops of the pre-cooling medium flow channel and the hydrogen flow channel are determined in the following manner:

[0145] S01: Determine the average temperature and average pressure of hydrogen flowing in the flow channel according to the heat transfer coefficient between hydrogen and the bottom wall surface of the flow channel at the inlet and outlet and the given values of the temperature and pressure at the inlet and outlet of hydrogen; determine the average temperature and average pressure of the pre-cooling medium flowing in the flow channel according to the heat transfer coefficient between the pre-cooling medium and the bottom wall surface of the flow channel at the inlet and outlet and the given values of the temperature and pressure at the inlet and outlet of hydrogen;

[0146] S02: Determine the average volume flow rate and average resistance coefficient of the pre-cooling medium and hydrogen flowing in the flow channel according to the given values of the target parameters of the pre-cooling medium and hydrogen, the average temperature and average pressure of the pre-cooling medium and hydrogen flowing in the flow channel, and the preset values of the structural parameters of the pre-cooling medium flow channel and the hydrogen flow channel;

[0147] S03: Determine the calculated values of the flow channel pressure drops of the pre-cooling medium flow channel and the hydrogen flow channel according to Equations 5 and 6:

[0148]

[0149] In Equation 5, ΔP 冷 is the calculated value of the flow channel pressure drop of the pre-cooling medium flow channel; f冷 is the average resistance coefficient of the precooling medium flowing in the flow channel; ρ 冷 is the density corresponding to the average temperature and average pressure of the precooling medium flowing in the flow channel; u 冷 is the average volume flow rate of the precooling medium flowing in the flow channel.

[0150] In Equation 6, ΔP 氢 is the calculated value of the flow channel pressure drop of the hydrogen flow channel; f 氢 is the average resistance coefficient of hydrogen flowing in the flow channel; ρ 氢 is the density corresponding to the average temperature and average pressure of hydrogen flowing in the flow channel, which can be obtained by querying the physical property database; u 冷 is the average volume flow rate of hydrogen flowing in the flow channel.

[0151] Among them, in S01, the average temperature and average pressure of hydrogen and the precooling medium flowing in the flow channel respectively can be calculated by referring to the method of the average temperature and average pressure of the aforementioned precooling medium and the bottom wall surface of the hydrogen flow channel. The difference is that, according to the given values of the temperature and pressure at the inlet and outlet of hydrogen and the precooling medium, the average value is taken or used as the standard for dividing multiple units.

[0152] In S02, the average volume flow rate and average resistance coefficient of the precooling medium and hydrogen flowing in the flow channel are calculated respectively by referring to the volume flow rate calculation formula shown in the aforementioned Equation 20 to Equation 23 and the resistance calculation formula shown in the aforementioned Equation 24 to Equation 27. The difference is that the temperature and pressure required in the calculation process are replaced by the average temperature and average pressure of hydrogen and the precooling medium flowing in the flow channel calculated by S01.

[0153] In S03, ρ 氢 and ρ 冷 can be obtained by querying the corresponding physical property parameter database.

[0154] In some embodiments of the present application, in S104, the preset threshold includes a first preset threshold and a second preset threshold. The first preset threshold is a value within the range of 1% difference from the preset value of the bottom wall surface temperature at the inlet and outlet of the precooling medium flow channel and the hydrogen flow channel, that is, a range value within 0.99 times to 1.01 times of the preset value. The second preset threshold is the required value of the flow channel pressure drop of the precooling medium flow channel and the hydrogen flow channel. The required value of the flow channel pressure drop can be determined according to different application scenarios and different requirement standards. For example, in a hydrogen precooling device used in a hydrogen refueling station, when the mass flow rate of hydrogen is 200 kg / hr and the inlet pressure is 60 MPa, the required value of the pressure drop of the hydrogen flow channel is ≤9000 Pa. The precooling medium is a mixture of water and ethylene glycol, the mass flow rate is 10400 kg / hr, the inlet pressure is 5 MPa, and the required value of the pressure drop of the precooling medium flow channel is ≤500000 Pa.

[0155] Further, in S104, according to the calculated values ​​of the bottom wall temperatures at the inlets and outlets of the precooling medium flow channel and the hydrogen flow channel, the calculated values ​​of the flow channel pressure drops of the precooling medium flow channel and the hydrogen flow channel, and the preset threshold, the structural parameters of the precooling medium flow channel and the hydrogen flow channel and the design values ​​of the bottom wall temperatures at the inlets and outlets are determined, including:

[0156] Determine the magnitude of the calculated value of the bottom wall temperature of the inlet and outlet of the precooling medium flow channel and the hydrogen flow channel and the first preset threshold, and the magnitude of the calculated value of the flow channel pressure drop of the precooling medium flow channel and the hydrogen flow channel and the second preset threshold;

[0157] If the calculated values ​​of the bottom wall temperatures at the inlet and outlet of the precooling medium flow channel and the hydrogen flow channel are within the first preset threshold range and the calculated values ​​of the flow channel pressure drops of the precooling medium flow channel and the hydrogen flow channel are ≤ the second preset threshold, then the preset values ​​of the structural parameters of the precooling medium flow channel and the hydrogen flow channel and the bottom wall temperatures at the inlet and outlet are determined to be the design values.

[0158] On the contrary, if the above requirements are not met, the structural parameters of the pre-cooling medium flow channel and the hydrogen flow channel and the preset values ​​of the bottom wall temperature of the inlet and outlet are adjusted and iteratively calculated until the requirements of the first preset threshold and the second preset threshold are met and then the design value is output.

[0159] The rapid and accurate calculation of the flow channel pressure drop and the bottom wall temperature is an important factor in the design of the precooling device. The flow channel pressure drop will cause the fluid to overcome greater resistance when flowing in the precooling device, which requires the precooling device to have greater power to promote the flow of the fluid, which will increase the energy consumption of the device. In addition, excessive pressure drop will cause the flow velocity of the fluid in the precooling device to be unevenly distributed, resulting in local flow velocities that are too high or too low, which is also not conducive to heat transfer. Reasonable flow channel pressure drop values ​​can reflect the rationality of the device structure design and balance the device between equipment investment and operating costs. Inaccurate calculation of the bottom wall temperature directly affects the heat transfer temperature difference of the precooling device. Rapid and accurate calculation of the bottom wall temperature can quickly and effectively obtain the heat transfer coefficient between the fluid and the flow channel wall. If the bottom wall temperature is not calculated reasonably, it may cause a large deviation in the heat transfer coefficient between the fluid and the flow channel wall, thereby affecting the accuracy of the heat exchange area and making the precooling device structure design unable to meet the design requirements. The present application calculates the bottom wall temperature of the flow channel inlet and outlet, reversely infers whether the preset inlet and outlet bottom wall temperatures are reasonable, and combines the calculated value of the flow channel pressure drop with the required value to make the designed hydrogen precooling device have higher heat transfer efficiency and more reasonable structural parameters.

[0160] The second aspect of the present application provides a design device for a hydrogen precooling device, Figure 9 For the schematic diagram of the design of the hydrogen precooling device provided in the embodiment of the present application, please refer to Figure 9 , the design device 10 of the hydrogen precooling device includes:

[0161] An acquisition module 11, configured to acquire given values of target parameters of a precooling medium and hydrogen; the target parameters include mass flow rate, temperatures and pressures at the inlet and outlet.

[0162] A preset module 12, configured to preset structural parameters of a precooling medium flow channel and a hydrogen flow channel, and bottom wall surface temperatures at the inlet and outlet according to the given values of the target parameters of the precooling medium and hydrogen; the structural parameters include equivalent diameter of the flow channel, length of the flow channel, thickness of the bottom wall surface of the flow channel, total number of the flow channels, and type of the flow channel plate material.

[0163] A calculation module 13, configured to determine calculated values of bottom wall surface temperatures at the inlet and outlet of the precooling medium flow channel and the hydrogen flow channel, and a calculated value of the flow channel pressure drop according to the given values of the target parameters of the precooling medium and hydrogen, preset values of the structural parameters of the precooling medium flow channel and the hydrogen flow channel, and preset values of the bottom wall surface temperatures at the inlet and outlet of the precooling medium flow channel and the hydrogen flow channel.

[0164] A determination module 14, configured to determine design values of the structural parameters of the precooling medium flow channel and the hydrogen flow channel, and bottom wall surface temperatures at the inlet and outlet according to the calculated values of the bottom wall surface temperatures at the inlet and outlet of the precooling medium flow channel and the hydrogen flow channel, the calculated value of the flow channel pressure drop of the precooling medium flow channel and the hydrogen flow channel, and a preset threshold.

[0165] Since the implementation solution of the above design device of the hydrogen precooling device for solving the problem is similar to the design method of the hydrogen precooling device, the implementation of the specific design device can refer to the implementation of the foregoing design method, and the repeated parts will not be described again.

[0166] A third aspect of the present application provides a computer device. Figure 10 For the schematic diagram of the computer device provided in the embodiment of the present application, please refer to Figure 10 , the computer device 20 includes a processor 21, and a memory 22 communicatively connected to the processor 21. The memory 22 stores computer-executable instructions, and the processor 21 executes the computer-executable instructions stored in the memory to implement the design method of the hydrogen precooling device provided in any one of the above embodiments.

[0167] A fourth aspect of the present application provides a computer-readable storage medium, in which computer-executable instructions are stored, and when the instructions are executed, the computer-executable instructions are used by the processor to implement the design method of the hydrogen precooling device provided in any one of the above embodiments.

[0168] It should be noted that the above computer-readable storage medium may be a read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), ferromagnetic random access memory (FRAM), flash memory, magnetic surface memory, optical disc, or compact disc read-only memory (CD-ROM), etc. It may also be various electronic devices including one or any combination of the above memories, such as mobile phones, computers, tablet devices, personal digital assistants, etc.

[0169] It should be noted that in this text, the term "including", "comprising", or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article, or device including a series of elements not only includes those elements but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, article, or device. Without more limitations, an element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, article, or device including that element.

[0170] Through the description of the above embodiments, those skilled in the art can clearly understand that the above-described embodiment methods can be implemented by means of software plus a necessary general hardware platform. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation. Based on such an understanding, the technical solution of this application, in essence, or the part that contributes to the prior art can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disc) and includes several instructions to enable a terminal device (which can be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the methods described in various embodiments of this application.

[0171] This application is described with reference to the flowcharts and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the present application. It should be understood that each flow and / or block in the flowchart and / or block diagram, and the combination of flows and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing device to generate a machine, such that the instructions executed by the processor of the computer or other programmable data processing device generate a means for implementing the functions specified in one or more of the flows Figure 1 one or more of the flows and / or blocks Figure 1 or a means for implementing the functions specified in one or more of the blocks.

[0172] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, such that the instructions stored in the computer-readable memory generate a manufactured article including an instruction means that implements the functions specified in one or more of the flows Figure 1 one or more of the flows and / or blocks Figure 1 or a means for implementing the functions specified in one or more of the blocks.

[0173] These computer program instructions can also be loaded onto a computer or other programmable data processing device, such that a series of operation steps are executed on the computer or other programmable device to generate a computer-implemented process, and thus the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in one or more of the flows Figure 1 one or more of the flows and / or blocks Figure 1 or a means for implementing the functions specified in one or more of the blocks.

[0174] In the above embodiments, the descriptions of the various embodiments have their own emphases. For parts not detailed in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0175] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as falling within the scope described in this specification.

[0176] The above embodiments only represent several implementation manners of the present invention, and their descriptions are relatively specific and detailed, but should not be construed as limiting the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims

1. A design method for a hydrogen precooling device, characterized in that: The following steps are involved: Obtaining given values ​​of target parameters of the precooling medium and hydrogen; the target parameters include mass flow rate, inlet and outlet temperatures and pressures; According to the given values ​​of the target parameters of the precooling medium and the hydrogen, the structural parameters of the precooling medium flow channel and the hydrogen flow channel and the bottom wall temperatures of the inlet and the outlet are preset; The structural parameters include flow channel equivalent diameter, flow channel length, flow channel bottom wall thickness, total number of flow channels and flow channel plate material type; Determine the calculated values ​​of the bottom wall temperatures at the inlet and outlet of the precooling medium flow channel and the hydrogen flow channel and the calculated value of the flow channel pressure drop according to the given values ​​of the target parameters of the precooling medium and the hydrogen, the preset values ​​of the structural parameters of the precooling medium flow channel and the hydrogen flow channel, and the preset values ​​of the bottom wall temperatures at the inlet and outlet of the precooling medium flow channel and the hydrogen flow channel; According to the calculated values ​​of the bottom wall temperatures at the inlets and outlets of the precooling medium flow channel and the hydrogen flow channel, the calculated values ​​of the flow channel pressure drops of the precooling medium flow channel and the hydrogen flow channel, and a preset threshold, the structural parameters of the precooling medium flow channel and the hydrogen flow channel and the design values ​​of the bottom wall temperatures at the inlets and outlets are determined.

2. The design method according to claim 1, characterized in that: The calculated values ​​of the bottom wall temperature at the inlet and outlet of the precooling medium flow channel and the hydrogen flow channel are determined by the following method: According to the given value of the mass flow rate of the precooling medium, the heat absorption of the precooling medium is determined; according to the given value of the mass flow rate of hydrogen, the heat release of hydrogen is determined; according to the given values ​​of the inlet and outlet temperatures of the precooling medium and hydrogen, the logarithmic mean temperature difference of the hydrogen precooling device is determined; According to the given values ​​of the target parameters of the precooling medium and hydrogen, the preset values ​​of the structural parameters of the precooling medium flow channel and the hydrogen flow channel, and the preset values ​​of the bottom wall surface temperatures at the inlet and outlet of the precooling medium flow channel and the hydrogen flow channel, the heat transfer coefficient between the hydrogen at the inlet and outlet and the bottom wall surface of the flow channel, the heat transfer coefficient between the precooling medium at the inlet and outlet and the bottom wall surface of the flow channel, and the total heat transfer coefficient of the hydrogen precooling device are determined; Determining the effective heat exchange area of ​​the hydrogen precooling device according to the heat absorption of the precooling medium, the logarithmic mean temperature difference of the hydrogen precooling device and the total heat exchange coefficient of the hydrogen precooling device; The calculated values ​​of the bottom wall temperatures at the inlet and outlet of the precooling medium flow channel are determined based on the given values ​​of the precooling medium temperature at the inlet and outlet, the amount of heat absorbed by the precooling medium, the heat transfer coefficient between the precooling medium and the bottom wall of the flow channel at the inlet and outlet, and the effective heat exchange area of ​​the hydrogen precooling device; the calculated values ​​of the bottom wall temperatures at the inlet and outlet of the hydrogen flow channel are determined based on the given values ​​of the hydrogen temperature at the inlet and outlet, the amount of heat released by the hydrogen, the heat transfer coefficient between the hydrogen and the bottom wall of the flow channel at the inlet and outlet, and the effective heat exchange area of ​​the hydrogen precooling device.

3. The design method according to claim 2, characterized in that: The heat transfer coefficient between the hydrogen at the inlet and outlet and the bottom wall of the flow channel, the heat transfer coefficient between the precooling medium at the inlet and outlet and the bottom wall of the flow channel, and the total heat transfer coefficient of the hydrogen precooling device are determined according to the given values ​​of the target parameters of the precooling medium and the hydrogen, the preset values ​​of the structural parameters of the precooling medium flow channel and the hydrogen flow channel, and the preset values ​​of the bottom wall temperatures of the inlet and outlet of the precooling medium flow channel and the hydrogen flow channel, including: Determine the Nusselt numbers of the precooling medium and the hydrogen at the inlet and outlet according to the given values ​​of the target parameters of the precooling medium and the hydrogen, the preset values ​​of the structural parameters of the precooling medium flow channel and the hydrogen flow channel, and the preset values ​​of the bottom wall surface temperatures at the inlet and outlet of the precooling medium flow channel and the hydrogen flow channel; Determine the heat transfer coefficient between the hydrogen at the inlet and outlet and the bottom wall of the flow channel, and the heat transfer coefficient between the precooling medium at the inlet and outlet and the bottom wall of the flow channel according to the Nusselt numbers of the precooling medium and the hydrogen at the inlet and outlet; The total heat transfer coefficient of the hydrogen precooling device is determined based on the heat transfer coefficient between the hydrogen at the inlet and outlet and the bottom wall of the flow channel, the heat transfer coefficient between the precooling medium at the inlet and outlet and the bottom wall of the flow channel, the thickness of the precooling medium flow channel and the bottom wall of the hydrogen flow channel, and the material type of the precooling medium flow channel plate and the hydrogen flow channel plate.

4. The design method according to claim 3, characterized in that: The calculated values ​​of the bottom wall temperature at the inlet and outlet of the precooling medium flow channel and the hydrogen flow channel are determined by equations 1 to 4: In formula 1, is the calculated value of the inlet bottom wall temperature of the precooling medium flow channel; T 冷1 is the given value of the inlet temperature of the precooling medium; Q 冷 is the heat absorbed by the precooling medium; A is the effective heat exchange area of ​​the hydrogen precooling device; h 冷1 is the heat transfer coefficient between the precooling medium at the inlet and the bottom wall of the flow channel; In formula 2, is the calculated value of the outlet bottom wall temperature of the precooling medium flow channel; T 冷2 is the outlet temperature setting value of the precooling medium; Q 冷 is the heat absorbed by the precooling medium; A is the effective heat exchange area of ​​the hydrogen precooling device; h 冷2 is the heat transfer coefficient between the precooling medium at the outlet and the bottom wall of the flow channel; In formula 3, is the calculated value of the inlet bottom wall temperature of the hydrogen flow channel; T 氢1 is the given value of hydrogen inlet temperature; Q 氢 is the heat released by hydrogen; A is the effective heat exchange area of ​​the hydrogen precooling device; h 氢1 is the heat transfer coefficient between hydrogen at the inlet and the bottom wall of the flow channel; In formula 4, is the calculated value of the outlet bottom wall temperature of the hydrogen flow channel; T 氢2 is the given value of hydrogen outlet temperature; Q 氢 is the heat released by hydrogen; A is the effective heat exchange area of ​​the hydrogen precooling device; h 冷2 is the heat transfer coefficient between hydrogen at the outlet and the bottom wall of the flow channel.

5. The design method according to claim 3, characterized in that: The calculated values ​​of the flow channel pressure drops of the precooling medium flow channel and the hydrogen flow channel are determined by the following method: Determine the average temperature and average pressure of the hydrogen flowing in the flow channel according to the heat transfer coefficient between the hydrogen at the inlet and outlet and the bottom wall of the flow channel, and the given values ​​of the temperature and pressure at the inlet and outlet of the hydrogen; determine the average temperature and average pressure of the precooling medium flowing in the flow channel according to the heat transfer coefficient between the precooling medium at the inlet and outlet and the bottom wall of the flow channel, and the given values ​​of the temperature and pressure at the inlet and outlet of the hydrogen; Determining an average volume flow rate and an average resistance coefficient of the precooling medium and hydrogen flowing in the flow channel according to given values ​​of target parameters of the precooling medium and hydrogen, average temperature and average pressure of the precooling medium and hydrogen flowing in the flow channel, and preset values ​​of structural parameters of the precooling medium flow channel and hydrogen flow channel; The calculated values ​​of the flow channel pressure drops of the precooling medium flow channel and the hydrogen flow channel are determined according to Formula 5 and Formula 6: In formula 5, ΔP 冷 is the calculated value of the flow channel pressure drop of the precooling medium flow channel; f 冷 is the average resistance coefficient of the precooling medium flowing in the flow channel; ρ 冷 u is the density corresponding to the average temperature and average pressure of the precooling medium flowing in the flow channel; 冷 is the average volume flow rate of the precooling medium flowing in the flow channel; l 冷 The preset value of the flow channel length of the pre-cooling medium flow channel; d 冷 Preset value for equivalent diameter of the precooling medium flow channel; In formula 6, ΔP 氢 is the calculated value of the flow channel pressure drop of the hydrogen flow channel; f 氢 is the average resistance coefficient of hydrogen flowing in the flow channel; ρ 冷 u is the density of hydrogen at the average temperature and average pressure in the flow channel; 冷 is the average volume flow rate of hydrogen flowing in the flow channel; l 冷 is the preset value of the flow channel length of the hydrogen flow channel; d 冷 Preset value for the equivalent diameter of the hydrogen flow channel.

6. The design method according to any one of claims 1 to 4, characterized in that: The preset threshold includes a first preset threshold and a second preset threshold, the first preset threshold is a value within a range of 1% difference from the preset value of the bottom wall surface temperature of the inlet and outlet of the pre-cooling medium flow channel and the hydrogen flow channel, and the second preset threshold is the required value of the flow channel pressure drop of the pre-cooling medium flow channel and the hydrogen flow channel.

7. The design method according to claim 6, characterized in that: The step of determining the design values ​​of the structural parameters of the precooling medium flow channel and the hydrogen flow channel and the bottom wall surface temperatures of the inlet and the outlet of the precooling medium flow channel and the hydrogen flow channel according to the calculated values ​​of the bottom wall surface temperatures of the inlet and the outlet of the precooling medium flow channel and the hydrogen flow channel, the calculated values ​​of the flow channel pressure drops of the precooling medium flow channel and the hydrogen flow channel, and a preset threshold value comprises: Determine the magnitude of the calculated values ​​of the bottom wall temperatures of the inlet and outlet of the precooling medium flow channel and the hydrogen flow channel and the first preset threshold, and the magnitude of the calculated values ​​of the flow channel pressure drops of the precooling medium flow channel and the hydrogen flow channel and the second preset threshold; If the calculated values ​​of the bottom wall surface temperatures at the inlet and outlet of the pre-cooling medium flow channel and the hydrogen flow channel are within the first preset threshold range and the calculated values ​​of the flow channel pressure drops of the pre-cooling medium flow channel and the hydrogen flow channel are ≤ the second preset threshold, then the preset values ​​of the structural parameters of the pre-cooling medium flow channel and the hydrogen flow channel and the bottom wall surface temperatures at the inlet and outlet are determined to be the design values.

8. A design device for a hydrogen precooling device, characterized in that: include: An acquisition module, used for acquiring given values ​​of target parameters of the precooling medium and hydrogen; The target parameters include mass flow rate, inlet and outlet temperatures and pressures; A preset module, used to preset the structural parameters of the precooling medium flow channel and the hydrogen flow channel and the bottom wall temperatures of the inlet and the outlet according to the given values ​​of the target parameters of the precooling medium and the hydrogen; The structural parameters include flow channel equivalent diameter, flow channel length, flow channel bottom wall thickness, total number of flow channels and flow channel plate material type; A calculation module, for determining calculated values ​​of bottom wall temperatures at the inlet and outlet of the precooling medium flow channel and the hydrogen flow channel and a calculated value of flow channel pressure drop according to given values ​​of target parameters of the precooling medium and hydrogen, preset values ​​of structural parameters of the precooling medium flow channel and the hydrogen flow channel, and preset values ​​of bottom wall temperatures at the inlet and outlet of the precooling medium flow channel and the hydrogen flow channel; A determination module is used to determine the structural parameters of the precooling medium flow channel and the hydrogen flow channel and the design values ​​of the bottom wall temperature of the inlet and outlet according to the calculated values ​​of the bottom wall temperature of the inlet and outlet of the precooling medium flow channel and the hydrogen flow channel, the calculated values ​​of the flow channel pressure drop of the precooling medium flow channel and the hydrogen flow channel, and a preset threshold.

9. A computer device, characterized in that: include: A processor, and a memory communicatively connected to the processor; The memory stores computer-executable instructions; The processor executes the computer-executable instructions stored in the memory to implement the design method of the hydrogen precooling device according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer-executable instructions, and when the computer-executable instructions are executed, the computer executes the design method for a hydrogen precooling device according to any one of claims 1 to 7.

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