Workshop ventilation system design method, terminal equipment and storage medium

Abstract

The invention relates to a factory building ventilation system design method, terminal equipment and a storage medium. The method comprises the steps that three-dimensional modeling is conducted on a factory building and internal equipment of the factory building; parameters of a ventilation system of the plant are set, and equipment type selection of the ventilation system is carried out according to the parameters; carrying out grid division on the constructed three-dimensional model and the internal flow field, and then carrying out simulation analysis to obtain an airflow organization distribution rule formed by the ventilation system of the factory building at different positions; performing simulation analysis for multiple times by adjusting the parameters of the ventilation system, and obtaining the optimal parameters of the ventilation system based on the results of the simulation analysis for multiple times; and designing the ventilation system of the plant based on the optimal parameters of the ventilation system. According to the method, the stability of airflow organization in the tall and large factory building, the safety of a working space and the comfort of a worker working face are improved, and effective design thoughts and suggestions are provided for design and transformation of a ventilation system of the tall and large factory building.

Description

Technical Field

[0001] The present invention relates to the field of industrial production, and in particular to a design method for a factory ventilation system, terminal equipment and a storage medium. Background Art

[0002] In the interior space of modern industrial tall plants, good airflow organization design plays an important role in improving air quality. It can often greatly improve the uniformity of temperature and wind speed distribution in the space, improve the indoor environment and environmental comfort, and avoid the formation of odor, toxic and harmful gas vortices due to airflow aggregation. Tall plants often have the characteristics of large floor height, large volume, numerous indoor equipment, irregular shape, difficult to determine heat and moisture dissipation, large vertical temperature gradient and obvious velocity gradient, which makes it difficult to control the environmental parameters inside the plant, and it is also difficult to verify the rationality of the airflow organization in the plant space. In previous design schemes, it is often difficult to verify the rationality of the airflow organization, mainly because the designers cannot observe the airflow organization in the design scheme through experiments, etc. Therefore, the use of simulation analysis software to visualize the airflow organization is of great significance in improving the indoor environment of the plant, enhancing the comfort of the operators and improving the safety of the operation. Summary of the invention

[0003] In order to solve the above problems, the present invention proposes a factory ventilation system design method, terminal equipment and storage medium.

[0004] The specific plan is as follows:

[0005] A method for designing a factory ventilation system comprises the following steps:

[0006] S1: 3D modeling of the plant and its internal equipment;

[0007] S2: Set the parameters of the ventilation system of the factory building and select the equipment of the ventilation system according to the parameters;

[0008] S3: After meshing the constructed three-dimensional model and the internal flow field, simulation analysis is performed to obtain the airflow organization and distribution law formed by the ventilation system of the factory building at different locations;

[0009] S4: performing multiple simulation analyses by adjusting the parameters of the ventilation system, and obtaining the optimal parameters of the ventilation system based on the multiple simulation analysis results;

[0010] S5: Design the ventilation system of the factory building based on the optimal parameters of the ventilation system.

[0011] Furthermore, the setting of the parameters of the ventilation system includes the boundary parameters, position and size of each air outlet in the ventilation system, wherein the boundary parameters include: temperature, ventilation volume, airflow pattern and wind speed.

[0012] Furthermore, the setting ranges of the temperatures in the boundary parameters corresponding to different locations in the factory building include: the setting range of the inner and outer wall temperatures of the factory building enclosure structure is 0 to 45°C, the setting range of the fluid temperature passing through the air inlet is 0 to 35°C, and the setting range of the fluid temperature passing through the exhaust port is 0 to 45°C.

[0013] Furthermore, the air outlets in the ventilation system include air inlets and air exhaust outlets, wherein the air inlets include 6 natural air inlets and 12 mechanical air inlets, the natural air inlets are arranged in the left and right three spans of the low-side factory building side wall, and the mechanical air inlets are arranged in the middle six spans of the low-side factory building side wall; the air exhaust outlets include 24 mechanical air exhaust outlets, which are arranged on the high-side factory building side wall.

[0014] Furthermore, the equipment selected for the ventilation system includes: axial flow fans, centrifugal fans, diagonal flow fans, roof fans and air towers.

[0015] Furthermore, during the simulation analysis, the simulation type is set to internal flow field analysis with the internal flow field, the fluid medium is set to air and the gravity is considered, and the wind speed and volume flow rate of each air outlet in the ventilation system are taken as the convergence target.

[0016] Furthermore, in the grid division, the divided grids include the enclosure structure grids and internal flow space grids of the plant, the grid precision level is set to level 6, and the grids are encrypted for areas in the plant where the inlet and outlet flow fields have a large range of variation.

[0017] Furthermore, in the process of obtaining the airflow organization distribution law, the advantages and disadvantages of the airflow organization are analyzed by using the airflow organization flow trajectory diagrams at different positions and heights obtained through simulation analysis results, and the flow distribution law of the airflow inside the factory is analyzed through the overhead cloud map and facade cloud map at different positions and heights of the factory.

[0018] A factory ventilation system design terminal device includes a processor, a memory, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of the method described above in the embodiment of the present invention are implemented.

[0019] A computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the method described above in an embodiment of the present invention are implemented.

[0020] The present invention adopts the above technical solution to improve the stability of airflow organization in tall factory buildings, the safety of working space and the comfort of personnel working surfaces, and provides effective design ideas and suggestions for the design and transformation of ventilation systems in tall factory buildings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Shown is a flow chart of a method according to a first embodiment of the present invention.

[0022] Figure 2 Shown is an axonometric view of the three-dimensional model of the factory building in this embodiment.

[0023] Figure 3 Shown is a top view of the factory air outlet arrangement in this embodiment.

[0024] Figure 4 Shown is a top view of the flow trajectory of the air flow organization velocity field at the center height of the factory air outlet in this embodiment (+3.5m, 0.0m is the indoor floor).

[0025] Figure 5 Shown is the right view of the flow trajectory of the air flow organization velocity field at the center height of the factory air outlet in this embodiment (+3.5m, 0.0m is the indoor floor).

[0026] Figure 6 The figure shows a bird's-eye view of the velocity distribution at the height of the factory staff's working surface (+1.5m, 0.0m is the indoor floor) in this embodiment.

[0027] Figure 7 Shown is a vertical cloud diagram of the velocity distribution of the flow field at the air inlet of the factory building in this embodiment.

[0028] Figure 8 Shown is a vertical cloud diagram of the velocity distribution of the flow field at the green channel for factory personnel (5m offset from the air inlet into the factory) in this embodiment.

[0029] Fig. 9 Shown is a vertical cloud diagram of the velocity distribution of the flow field at the center line of the plant in this embodiment.

[0030] Fig.10 Shown is a vertical cloud diagram of the velocity distribution of the flow field at the exhaust outlet of the factory building in this embodiment. DETAILED DESCRIPTION

[0031] To further illustrate various embodiments, the present invention provides drawings. These drawings are part of the disclosure of the present invention, which are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, ordinary technicians in this field should be able to understand other possible implementations and advantages of the present invention.

[0032] The present invention will now be further described with reference to the accompanying drawings and specific implementation methods.

[0033] Embodiment 1:

[0034] The embodiment of the present invention provides a method for designing a factory ventilation system. Figure 1 As shown, the method comprises the following steps:

[0035] S1: Conduct 3D modeling of the factory building and its internal equipment.

[0036] Figure 2 The three-dimensional model constructed in this embodiment is shown, and the size parameters of the corresponding factory building are: length: 216m, width: 36m, height: 16.9m (median), height: 17.8m (high side), height: 16.9m (low side). When three-dimensional modeling of the factory building, the three-dimensional modeling is mainly performed on its enclosure structure and the column structure in the factory building. Since the internal environment of a tall factory building is relatively complex and in order to reduce the complexity of the model, in this embodiment, only the main equipment in the factory building (such as grinders and rollers) is modeled, and the modeling of sundries, operators, lighting equipment, mechanical parts and other small equipment is cancelled to simplify the model. Secondly, the lifting equipment such as the crane on the top of the factory building is not always in operation and its location has little effect on the airflow organization, so it is also ignored during three-dimensional modeling (that is, the location of such equipment is regarded as an open area).

[0037] S2: Set the parameters of the factory's ventilation system and select equipment for the ventilation system based on the parameters.

[0038] The setting of the parameters of the ventilation system includes the boundary parameters, position and size of each vent in the ventilation system, wherein the boundary parameters include: temperature, ventilation volume (volume flow), airflow pattern and wind speed. In this embodiment, the setting range of the temperature corresponding to different positions of the factory building includes: the setting range of the inner and outer wall temperature of the factory building enclosure structure is 0-45°C, the setting range of the fluid temperature through the air inlet is 0-35°C, and the setting range of the fluid temperature through the exhaust port is 0-45°C; the wind speed is the flow velocity of the fluid medium through the vent interface; the airflow pattern is set to turbulent flow; the ventilation volume is obtained by multiplying the set vent size and wind speed.

[0039] like Figure 3 As shown, the air inlets in the ventilation system in this embodiment include air inlets and air outlets, wherein the air inlets include 6 natural air inlets and 12 mechanical air inlets, and the specific parameters are as follows:

[0040] Natural air inlet: size: 5m*1.5m, height of the center of the air inlet from the indoor floor: 3.5m, number of air inlets: 6, arranged in the left and right three spans of the side wall of the low-side factory building;

[0041] Mechanical air inlet: size: 2m*2m, the center of the air inlet is 3.5m above the indoor floor, quantity: 12, arranged in the middle six spans of the side wall of the low-side plant;

[0042] Mechanical exhaust vents: Size: 2m*2m, the center of the vent is 15.0m above the indoor floor, quantity: 24, evenly arranged on the side walls of the high-side factory building.

[0043] For the natural air inlet, the boundary condition is set to "ambient pressure" and is set to 101.2 kPa, and the inlet airflow state is turbulent.

[0044] For the mechanical air inlet, the boundary condition is set to "inlet wind speed" and is set to 1.9 m / s, the airflow state is turbulent, and the pressure is set to ambient pressure.

[0045] For the mechanical exhaust vent, the boundary condition is set to "outlet wind speed" and is set to 1.9 m / s, the airflow state is turbulent, and the pressure is set to ambient pressure.

[0046] In the above air outlet pressure setting, since the air inlet and exhaust outlet of the ventilation system are all in direct contact with the outdoor environment and connected to the atmosphere, the ambient pressure is used.

[0047] The equipment selected for the ventilation system in this embodiment includes: axial flow fans, centrifugal fans, diagonal flow fans, roof fans and air towers, etc. The selection of ventilation equipment can be selected from equipment atlases published by relevant departments or equipment samples of manufacturers.

[0048] Due to the existence of a certain temperature gradient inside the factory building, the influence of temperature on ventilation volume is relatively small based on the installation of mechanical forced exhaust equipment. Through on-site investigation of the factory building, it was found that there is a 5°C temperature difference between the factory building and the outdoor environment. Therefore, the temperature difference between the mechanical / natural air inlet and the mechanical exhaust outlet is set to 5°C.

[0049] S3: After meshing the constructed three-dimensional model and the internal flow field, simulation analysis is performed to obtain the airflow organization and distribution rules formed by the factory ventilation system at different locations.

[0050] In this embodiment, CFD software is used for meshing and simulation analysis, and SolidWorks FlowSimulation is used to simulate and mesh the three-dimensional model. In meshing, the meshes divided include the enclosure structure mesh of the plant and the internal flow space mesh. In addition, considering the computer's operating capacity, the mesh precision level is set to level 6, and the mesh is encrypted for the areas with large changes in the inlet and outlet flow fields in the plant, resulting in a total of 688,876 meshes and 341,567 fluid contact meshes.

[0051] In the above parameter settings, the main parameters are the wind speed and size (length and width) of the air outlet, so "wind speed" and "volume flow rate" are set as the convergence targets during simulation.

[0052] Since the ventilation system is arranged inside the factory building, the simulation type set in this embodiment is internal flow field analysis. The fluid medium is air and gravity is considered. The direction of gravity is vertically downward along the Y axis, and the value is -9.8m / s2 , and other directions (X and Z) are set to 0.

[0053] In the process of obtaining the airflow organization distribution law, this embodiment analyzes the advantages and disadvantages of the airflow organization through the flow trajectory diagram of the airflow organization at different positions and heights obtained through simulation analysis results, and analyzes the flow distribution law of the airflow inside the factory building through the overhead cloud map and vertical cloud map at different positions and heights of the factory building. That is, through the flow trajectory diagram, vertical cloud map and overhead cloud map corresponding to different positions and heights, the airflow organization distribution law formed by the ventilation system of the factory building at different positions can be intuitively obtained.

[0054] like Figure 4 and Figure 5 As shown, through the top view of the flow trajectory of the air flow organization velocity field at the center height of the factory air outlet (+3.5m, 0.0m is the indoor floor), it can be seen that the overall air flow organization of the flow field is relatively smooth and orderly, and no unfavorable air flow organization such as air flow vortices occurs.

[0055] like Figure 6 and Figure 7 As shown in the figure, through the bird's-eye view and elevation cloud maps of the velocity distribution at the center height of the factory air outlet (+3.5m) and the height of the personnel working surface (+1.5m), it can be concluded that the wind speed range is 0.2~0.4m / s, which is in line with the factory air flow velocity regulations in the factory design specifications, and the staff in the working area will not have an obvious feeling of blowing wind; secondly, due to the fixed total amount of mechanical exhaust air, the natural air intake after removing the mechanical air supply volume enters the flow field through the natural air inlet, and a large air flow velocity is formed at the position of the natural air inlet in the left and right three spans of the factory. The air flow volume is large in the channels close to the two sides of the factory, forming an air flow channel.

[0056] like Figure 8 As shown, through the velocity distribution elevation of the flow field at the green channel for factory personnel (5m offset from the air inlet into the factory), it can be concluded that the size, position and wind speed setting of the air supply outlet in the main working area of ​​the factory make the air flow velocity at the middle line of the factory decay to 0.4-0.5m / s, which meets the air flow velocity regulations of the factory design specifications. The staff will not have a noticeable feeling of being blown by the wind and have a high degree of comfort.

[0057] like Fig. 9 As shown in the figure, through the vertical cloud map of the flow field velocity distribution at the green channel for factory personnel, it is concluded that the wind speed range in this plane is 0.22~0.4m / s, which is in line with the factory air flow velocity requirements (0.3~0.5m / s) in the factory design specifications, and the staff in the working area will not have a noticeable feeling of being blown by the wind.

[0058] like Fig.10As shown in the vertical cloud diagram of the velocity distribution of the flow field at the factory exhaust outlet, it is found that the wind speed range at this location is 0.28~0.5m / s, which is in line with the factory air flow velocity regulations in the factory design specifications.

[0059] S4: Perform multiple simulation analyses by adjusting the parameters of the ventilation system, and obtain the optimal parameters of the ventilation system based on the results of the multiple simulation analyses.

[0060] During multiple simulation analyses, the airflow organization and distribution in different simulation schemes were compared and analyzed, and the schemes were adjusted.

[0061] The specific analysis process includes:

[0062] (1) Analyze whether the exhaust volume of the ventilation system in the simulation results meets the ventilation needs of the factory;

[0063] (2) Analyze the influence of the layout and size of the air supply and exhaust vents on the air flow organization in the flow field;

[0064] (3) Analyze the impact of the wind speed settings of the air supply and exhaust vents in the simulation results on the indoor working environment;

[0065] (4) Analyze whether the airflow velocity on the working surface of personnel in the simulation results meets the requirements of the design specifications and whether the workers will feel the wind blowing.

[0066] Specific adjustments include:

[0067] (1) Adjust the position and size parameters of the air inlet and outlet: Explore the appropriate position and size parameters of the air outlet;

[0068] (2) Adjust the equipment parameters of the ventilation equipment: explore ventilation equipment with appropriate parameters;

[0069] (3) Adjust the environmental conditions of the ventilation renovation plan: Analyze the dynamic change trend of the plan based on different environmental conditions, and explore the operating rules of the ventilation system under different conditions to facilitate subsequent design work.

[0070] S5: Design the ventilation system of the factory building based on the optimal parameters of the ventilation system.

[0071] The present invention obtains the airflow organization distribution formed by the ventilation system in the tall factory building through CFD flow field simulation analysis of the three-dimensional model of the factory building. By analyzing the airflow organization distribution, the parameters and ventilation equipment layout are adjusted to avoid uneven airflow distribution and gas accumulation.

[0072] The ventilation system in this embodiment adopts the arrangement of natural / mechanical air intake + mechanical exhaust. Through multiple simulation calculations and analyses, the reasonable position and size of the natural air inlet and the air intake / exhaust volume and air intake / exhaust speed of the mechanical air inlet / exhaust are obtained, ensuring that the internal flow field of the tall factory building has a reasonable air flow velocity, uniform air volume distribution, orderly air flow organization and energy conservation, and thus designing an ideal tall factory building ventilation system. The simulation results obtain the air flow organization flow trace diagram and velocity distribution cloud diagram of the internal flow field of the tall factory building in different longitudinal and transverse sections, and judge the ventilation effect and air flow distribution law of the ventilation system at different heights and positions of the factory building.

[0073] Embodiment 2:

[0074] The present invention also provides a factory ventilation system design terminal device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps in the above-mentioned method embodiment of the first embodiment of the present invention when executing the computer program.

[0075] Further, as an executable solution, the plant ventilation system design terminal device can be a computing device such as a desktop computer, a notebook, a PDA, and a cloud server. The plant ventilation system design terminal device may include, but is not limited to, a processor and a memory. Those skilled in the art can understand that the composition structure of the plant ventilation system design terminal device is only an example of the plant ventilation system design terminal device, and does not constitute a limitation on the plant ventilation system design terminal device. It may include more or less components than the above, or a combination of certain components, or different components. For example, the plant ventilation system design terminal device may also include input and output devices, network access devices, buses, etc., and the embodiments of the present invention do not limit this.

[0076] Further, as an executable solution, the processor may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, etc. The general-purpose processor may be a microprocessor or any conventional processor, etc. The processor is the control center of the plant ventilation system design terminal device, and uses various interfaces and lines to connect various parts of the entire plant ventilation system design terminal device.

[0077] The memory can be used to store the computer program and / or module, and the processor realizes various functions of the plant ventilation system design terminal device by running or executing the computer program and / or module stored in the memory, and calling the data stored in the memory. The memory can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system and an application required for at least one function; the data storage area can store data created according to the use of the mobile phone, etc. In addition, the memory can include a high-speed random access memory, and can also include a non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), at least one disk storage device, a flash memory device, or other volatile solid-state storage devices.

[0078] The present invention also provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the above method in the embodiment of the present invention are implemented.

[0079] If the module / unit integrated in the plant ventilation system design terminal equipment is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present invention implements all or part of the processes in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned various method embodiments when executed by the processor. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device that can carry the computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory) and software distribution medium, etc.

[0080] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, it should be understood by those skilled in the art that various changes may be made to the present invention in form and details without departing from the spirit and scope of the present invention as defined by the appended claims, all of which are within the scope of protection of the present invention.

Claims

1. A method for designing a factory ventilation system, characterized in that: The following steps are involved: S1: 3D modeling of the plant and its internal equipment; S2: Set the parameters of the ventilation system of the factory building and select the equipment of the ventilation system according to the parameters; S3: After meshing the constructed three-dimensional model and the internal flow field, simulation analysis is performed to obtain the airflow organization and distribution law formed by the ventilation system of the factory building at different locations; S4: performing multiple simulation analyses by adjusting the parameters of the ventilation system, and obtaining the optimal parameters of the ventilation system based on the multiple simulation analysis results; S5: Design the ventilation system of the factory building based on the optimal parameters of the ventilation system.

2. The factory building ventilation system design method according to claim 1, characterized in that: The setting of ventilation system parameters includes the boundary parameters, position and size of each air outlet in the ventilation system, wherein the boundary parameters include: temperature, ventilation volume, airflow pattern and wind speed.

3. The factory building ventilation system design method according to claim 2, characterized in that: The setting ranges of the temperatures in the boundary parameters corresponding to different locations in the factory building include: the setting range of the inner and outer wall temperatures of the factory building enclosure structure is 0 to 45°C, the setting range of the fluid temperature passing through the air inlet is 0 to 35°C, and the setting range of the fluid temperature passing through the exhaust outlet is 0 to 45°C.

4. The factory building ventilation system design method according to claim 2, characterized in that: The air vents in the ventilation system include air inlets and air exhaust vents. The air inlets include 6 natural air inlets and 12 mechanical air inlets. The natural air inlets are set in the left and right three spans of the low-side factory building side wall, and the mechanical air inlets are set in the middle six spans of the low-side factory building side wall; the air exhaust vents include 24 mechanical air exhaust vents, which are set on the high-side factory building side wall.

5. The factory building ventilation system design method according to claim 1, characterized in that: The equipment used in the ventilation system includes: axial flow fans, centrifugal fans, diagonal flow fans, roof fans and air towers.

6. The method for designing a factory ventilation system according to claim 1, characterized in that: During the simulation analysis, the simulation type is set to internal flow field analysis, the fluid medium is set to air and the gravity is considered, and the wind speed and volume flow rate of each air outlet in the ventilation system are used as the convergence target.

7. The factory building ventilation system design method according to claim 1, characterized in that: In the grid division, the divided grids include the building's enclosure structure grid and the internal flow space grid. The grid precision level is set to level 6, and the grid is encrypted in areas where the inlet and outlet flow fields in the building have a large range of variation.

8. The factory building ventilation system design method according to claim 1, characterized in that: In the process of obtaining the distribution law of airflow organization, the advantages and disadvantages of airflow organization are analyzed by the flow trajectory diagram of airflow organization at different positions and heights obtained through simulation analysis results, and the flow distribution law of airflow inside the factory is analyzed through the overhead cloud map and vertical cloud map at different positions and heights of the factory.

9. A plant ventilation system design terminal device, characterized by: The method comprises a processor, a memory and a computer program stored in the memory and running on the processor, wherein the processor implements the steps of the method according to any one of claims 1 to 8 when executing the computer program.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 8 are implemented.

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