Circulating cooling water system mechanism model construction method and device, equipment and storage medium

Abstract

The invention provides a circulating cooling water system mechanism model construction method and device, equipment and a storage medium, and belongs to the technical field of industrial mechanism modeling, and the method comprises the steps: obtaining the structure information of a circulating cooling water system, and responding to the structure information to generate a graphical first model, and determining parameters and state data corresponding to the graphical first model and environmental condition data, and generating an equalized second model based on the graphical first model and the corresponding parameters and state data and environmental condition data. According to the method, the first model capable of visually displaying the structure of the circulating cooling water system and the second model capable of representing the operation mechanism of the circulating cooling water system can be rapidly constructed, and the equalized second model is automatically generated by the graphical first model; the construction speed of the circulating cooling water system mechanism model is accelerated, and the construction process of the mechanism model is simplified.

Description

Technical Field

[0001] The present application relates to the technical field of industrial mechanism modeling, and in particular to a method and device, equipment and storage medium for constructing a circulating cooling water system mechanism model. Background Art

[0002] The circulating cooling water system refers to a water supply system that cools the cooling water and recycles it after heat exchange. It plays a vital role in industrial production and is widely used in many industrial fields such as petroleum, chemical industry, electricity, metallurgy, etc. Its operating efficiency and stability directly affect the quality and cost of industrial production. The main function of the circulating cooling water system is to absorb heat by circulating cooling water to maintain the temperature of the equipment within the operable range. The principle is that the hot water in the equipment to be cooled (production equipment) flows into the cooling tower or heat exchanger and dissipates heat under the action of the external air; the pump station extracts the cooling water from the water tank and delivers it to the equipment to be cooled through the pipeline system; the cooling water absorbs heat in the equipment to be cooled and returns to the water tank after becoming hot; the control system monitors the temperature of the cooling water. When the temperature exceeds the set value, the pump station is controlled to increase the flow rate to maintain the temperature of the equipment to be cooled. The amount of circulating cooling water accounts for about 70% to 80% of the total industrial water consumption. Since the circulating cooling water system recycles water, it reduces the waste of water resources and has great water-saving significance.

[0003] However, the circulating cooling water systems of industrial enterprises lack tools for precise calculations during the design phase. Some circulating cooling water systems are prone to large deviations. In actual operation, there are high water and power consumption, and the water pump cannot operate under rated conditions. In order to optimize the circulating cooling water system, calculations are performed by modeling during the design phase, such as a comprehensive optimization method for a net circulating cooling water system based on a hierarchical nested algorithm disclosed in CN104573882A. However, traditional modeling methods for circulating cooling water systems are usually more complicated and difficult to intuitively reflect the structure of the system, especially when dealing with large and ultra-large circulating cooling water systems, there is a problem of low modeling efficiency. Summary of the invention

[0004] In response to the above problems, the present application provides a method and device, equipment and storage medium for constructing a circulating cooling water system mechanism model to intuitively reflect the structure of the circulating cooling water system and improve the efficiency of constructing the mechanism model.

[0005] The present application provides a method for constructing a circulating cooling water system mechanism model, comprising: Acquiring structural information of a circulating cooling water system, and generating a graphical first model in response to the structural information, wherein the structure of the circulating cooling water system includes a first component, a second component, and a pipeline connecting the first component and the second component; the structural information of the circulating cooling water system includes first component information, second component information, pipeline information, and connection relationship information between the first component, the second component, and the pipeline; generating the graphical first model in response to the structural information based on a pre-established component library including the first component and the second component and a pipeline library including the pipeline; Determine the parameters and state data and environmental condition data corresponding to the first graphical model, wherein the parameters and state data corresponding to the first model include the parameters and state data of the first component, the second component and the pipeline, and receive settings and adjustments to the parameters and state data of the first component, the second component and the pipeline to determine the parameters and state data and environmental condition data corresponding to the first graphical model; Based on the graphical first model and the corresponding parameters, status data and environmental condition data, an equation-based second model is generated, wherein the graphical first model is analyzed to identify the first component, the second component and the pipeline of the first model, and the connection relationship between the first component, the second component, the pipeline and the first component, the second component and the pipeline, the parameters and status data of the first component, the second component and the pipeline, and the environmental condition data are used to generate the equation-based second model representing the operating mechanism of the circulating cooling water system.

[0006] Preferably, the generating of the first graphical model in response to the structural information based on a pre-established component library including the first component and the second component and a pipeline library including the pipeline includes performing a filtering operation in the component library and the pipeline library according to the structural information, receiving the filtering operation and combining the filtered first component, the second component and the pipeline to generate the first graphical model.

[0007] Preferably, receiving the filtering operation and combining the filtered first component, the second component and the pipeline to generate the graphical first model includes dragging the filtered first component, the second component and the pipeline to a model building area, combining the first component, the second component and the pipeline in the model building area to generate the graphical first model.

[0008] Preferably, the generating of the first graphical model in response to the structural information based on a pre-established component library including the first component and the second component and a pipeline library including the pipeline includes determining, based on the structural information, whether components and / or pipelines required for generating the first model exist in the component library and the pipeline library, and if the required components and / or pipelines do not exist in the pre-established component library and / or the pipeline library, expanding the component library and / or the pipeline library.

[0009] Preferably, determining the parameters and state data and environmental condition data corresponding to the graphical first model includes receiving settings for the environmental condition data of the first model to determine the environmental condition data of the first model.

[0010] Preferably, based on the graphical first model and the corresponding parameters and state data as well as the environmental condition data, generating the equationized second model includes generating an equation set consisting of equations corresponding to the first component, the second component and the pipeline, the equation set including the mass conservation equation, the energy conservation equation, the pipeline pressure drop equation, the pipeline heat dissipation equation, the heat transfer equation of the heat exchanger, the pressure drop equation for the tube side and the shell side of the shell and tube heat exchanger, the pressure drop equation for the hot and cold sides of the plate heat exchanger and / or the heat transfer equation for the cooling tower.

[0011] Preferably, after generating an equation-based second model based on the graphical first model and the corresponding parameters, state data and environmental condition data, the second model is verified and / or performance analyzed, and the second model is adjusted according to the verification and / or performance analysis results.

[0012] The present application provides a circulating cooling water system mechanism model construction device, comprising a first model generation module, a data determination module, and a second model generation module; The first model generation module is used to obtain structural information of a circulating cooling water system, and generate a graphical first model in response to the structural information, wherein the structure of the circulating cooling water system includes a first component, a second component, and a pipeline connecting the first component and the second component; the structural information of the circulating cooling water system includes first component information, second component information, pipeline information, and connection relationship information between the first component, the second component, and the pipeline; based on a pre-established component library including the first component and the second component and a pipeline library including the pipeline, the graphical first model is generated in response to the structural information; The data determination module is used to determine the parameters and state data and environmental condition data corresponding to the first graphical model, wherein the parameters and state data corresponding to the first model include the parameters and state data of the first component, the second component and the pipeline, and receive the setting and adjustment of the parameters and state data of the first component, the second component and the pipeline to determine the parameters and state data and environmental condition data corresponding to the first graphical model; The second model generation module is used to generate an equation-based second model based on the graphical first model and the corresponding parameters, status data and environmental condition data, wherein the graphical first model is parsed to identify the first component, the second component and the pipeline of the first model, and the connection relationship between the first component, the second component, the pipeline and the first component, the second component and the pipeline, the parameters and status data of the first component, the second component and the pipeline, and the environmental condition data are used to generate the equation-based second model representing the operating mechanism of the circulating cooling water system.

[0013] The present application provides a computer electronic device, including a memory, a processor and a computer program stored in the memory, wherein the processor executes the computer program to implement the steps of the above-mentioned method for constructing a circulating cooling water system mechanism model.

[0014] The present application provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the steps of the method for constructing a mechanism model of a circulating cooling water system are implemented.

[0015] The present application provides a method and apparatus, equipment and storage medium for constructing a mechanism model of a circulating cooling water system, which has at least the following beneficial effects: first, structural information of the circulating cooling water system is obtained, and a graphical first model is generated in response to the structural information, and parameters and status data and environmental condition data corresponding to the graphical first model are determined; then, based on the graphical first model and the corresponding parameters and status data and environmental condition data, an equation-based second model is generated; through a graphical interface, the first component, the second component, the pipeline and their connection relationship of the circulating cooling water system can be intuitively displayed, and then information can be automatically extracted from the graphical first model to generate the second model containing the operating mechanism equation of the circulating cooling water system, thereby simplifying the construction process of the second model. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a flow chart of a method for constructing a mechanism model of a circulating cooling water system according to an embodiment of the present application.

[0017] Figure 2 It is a schematic diagram of the first model modeling interface of the method for constructing a circulating cooling water system mechanism model in an embodiment of the present application.

[0018] Figure 3 It is a schematic diagram of the first model modeling result of the method for constructing the mechanism model of the circulating cooling water system in an embodiment of the present application.

[0019] Figure 4 Schematic diagram of a first model olefin separation section of an example of a circulating cooling water system according to an embodiment of the present application.

[0020] Figure 5 It is a schematic diagram of the first model methanol to olefins part of an example of a circulating cooling water system of an embodiment of the present application.

[0021] Figure 6 It is a schematic diagram of the air separation and air compression part of the first model of the circulating cooling water system example of the embodiment of the present application.

[0022] Figure 7 It is a structural schematic diagram of a circulating cooling water system mechanism model building device according to an embodiment of the present application.

[0023] Explanation of the accompanying drawings: 100, first model generation module; 200, data determination module; 300, second model generation module; 400, second model verification module; 500, performance analysis module; 600, optimization module; 700, result display module. DETAILED DESCRIPTION

[0024] The following is combined with specific embodiments and appendix Figure 1-7 A detailed description of the application is given so that those skilled in the art can more fully understand the purpose, features and effects of the application.

[0025] Unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. When the definition of a term in this application conflicts with the meaning commonly understood by those skilled in the art to which this application belongs, the definition described in this application shall prevail.

[0026] The circulating cooling water system is an efficient and environmentally friendly cooling method, which is widely used in various industrial fields, such as electricity, chemical industry, refrigeration, machinery, metallurgy, etc. The circulating cooling water system refers to a water supply system in which cooling water is recycled after heat exchange and cooling. It is mainly composed of cooling equipment, water pumps and pipes. After the cold water flows through the production equipment that needs to be cooled (such as heat exchangers, condensers, reactors, etc.), the temperature rises. If it is discharged immediately, the cold water is only used once, which is called a direct cooling water system. The circulating cooling water system allows the heated cooling water to flow through the cooling equipment, and after the water temperature drops, it is pumped back to the production equipment for reuse, thereby greatly reducing the amount of cold water used. It has the advantages of water saving, energy saving, intelligent controllability, and helps enterprises achieve benefits in energy conservation and emission reduction, green production, and contributes to environmental protection. Modeling the circulating cooling water system in the design stage and operation and transformation stage can more clearly understand the operating mechanism of the system.

[0027] The present application provides a method for constructing a mechanism model of a circulating cooling water system, which quickly constructs a first model that can intuitively display the structure of the circulating cooling water system and a second model that represents the operating mechanism of the circulating cooling water system. The graphical first model automatically generates an equation-based second model, thereby speeding up the construction of the mechanism model of the circulating cooling water system and simplifying the construction process of the mechanism model.

[0028] Embodiment 1 As a specific embodiment of the present application, this embodiment provides a method for constructing a circulating cooling water system mechanism model, referring to Figure 1 , Figure 2 , the specific steps are as follows: S1. Acquire structural information of a circulating cooling water system, and generate a graphical first model in response to the structural information. In this embodiment, the structure of the circulating cooling water system includes a first component, a second component, and a pipeline connecting the components, and the structural information of the circulating cooling water system includes first component information, second component information, pipeline information, and connection relationship information between the first component, the second component, and the pipeline. The circulating cooling water system is composed of a plurality of the first components, the second components, and the pipelines. By decomposing the circulating cooling water system into more detailed first components, the second components, and the pipelines, the various components of the circulating cooling water system and the connection relationship between them can be clearly obtained, which helps to better understand the overall structure and function of the circulating cooling water system.

[0029] In an optional embodiment, the structural information of the circulating cooling water system can be obtained through the design drawings and equipment list of the circulating cooling water system. When constructing a model for an existing circulating cooling water system, in order to further improve the accuracy of the structural information of the circulating cooling water system obtained, on-site verification can be carried out for some key areas.

[0030] The first component is the main equipment component of the circulating cooling water system. The first component is the operating equipment or device used in the circulating cooling water system, including a cooling tower, a water tank, a circulating water pump, a heat exchanger, a temperature controller, an error controller and / or a heat material source, wherein the heat exchanger includes a shell and tube heat exchanger, a plate heat exchanger and / or a universal heat exchanger.

[0031] According to the overall design of the circulating cooling water system, the type and quantity of the first components required and the relative positions of different first components are determined. Since different circulating cooling water systems have different scales and application scenarios, when determining the first component information, the type and quantity of the first components of different circulating cooling water systems need to be clarified according to the overall design of the system.

[0032] The second component is a key point component of the circulating cooling water system and an indispensable component of the circulating cooling water system. Due to its small size, it can be regarded as a "key point" in the circulating cooling water system. The second component is an instrument and component in the circulating cooling water system used to connect the pipeline or the first component, including elbows, reducers, tees, various instruments, stop valves and / or regulating valves.

[0033] Furthermore, each of the first components is provided with a component connection point, specifically, the component connection point includes an input connection point and an output connection point. The component connection point of the first component indicates the movement direction of the circulating water flow, wherein the input connection point of the first component indicates an end where the circulating water flows into the first component, and the output connection point of the first component indicates an end where the circulating water flows out of the first component. The component connection point of the first component also belongs to the second component and is a key point component of the circulating cooling water system.

[0034] The pipeline connects the second component, including a circulating water pipeline, a water replenishment pipeline, and a sewage pipeline. Specifically, the pipeline connects the first component through the second component. Depending on the type and function, the second component can be located on the pipeline, such as an instrument, or located at one end of the pipeline for connecting the first component and the pipeline. In this embodiment, the component connection point of the first component is used to connect to the pipeline.

[0035] By reasonably dividing the entire circulating cooling water system, each part of the circulating cooling water system is corresponded to a specific first component, the second component and the pipeline, thereby avoiding omissions.

[0036] Furthermore, the first component information includes the type, parameters and status of the first component as attributes of the first component; the second component information includes the type, parameters and status of the second component as attributes of the second component; the pipeline information includes the type, parameters and status of the pipeline as attributes of the pipeline. Specifically, for the pipeline, its parameters include the diameter, length, material, roughness, laying method and burial depth of the pipeline.

[0037] Further, generating a graphical first model in response to the acquired structural information of the circulating cooling water system includes: pre-establishing a component library including the first component and the second component and a pipeline library including the pipeline; Based on the pre-established component library and pipeline library, and in response to the acquired structural information of the circulating cooling water system, the graphical first model is generated.

[0038] Furthermore, the component library includes a first component sub-library and a second component sub-library, and the first component and the second component are divided into different character libraries to facilitate later screening. Specifically, when generating the first graphical model, according to the structural information of the circulating cooling water system, the required first component, the second component and the pipeline are screened from the component library and the pipeline library, and after receiving the screening operation, the screened first component, the second component and the pipeline are combined to generate the first graphical model. Optionally, the first component, the second component and the pipeline are displayed in a graphical form in the component library and the pipeline library, so as to facilitate screening.

[0039] Furthermore, in a possible scenario, when it is determined based on the acquired structural information of the circulating cooling water system that the required components and / or pipelines do not exist in the pre-established component library and / or the pipeline library, the component library and / or the pipeline library is expanded to ensure that the components and pipelines required for generating the first model have been pre-established, thereby speeding up the generation of the first model. Further, in a possible situation, when it is determined according to the acquired structural information of the circulating cooling water system that the required components and / or pipelines do not exist in the pre-established component library and / or pipeline library, the required components and / or pipelines are drawn using a drawing tool. For example, a "pipeline" drawing tool can be used to draw pipelines, and a "component" drawing tool can be used to draw components.

[0040] Preferably, in this embodiment, according to the acquired structural information of the circulating cooling water system, the required first component, second component and pipeline are screened in the component library and the pipeline library, and the screening and dragging instructions for the first component, the second component and the pipeline are received, and the first component, the second component and the pipeline are released to the model building area by dragging, and the first component, the second component and the pipeline are combined in the model building area to automatically generate a graphical first model. The scaling instructions for the first component, the second component and the pipeline are received, and the sizes of the first component, the second component and the pipeline can be adjusted. In a feasible embodiment, the model building area can draw components and pipelines.

[0041] The automatically generated first model can intuitively reflect the structure of the circulating cooling water system. When the first component, the second component and the pipeline are combined, movement instructions for the first component, the second component and the pipeline are received, and the positions, directions and connection relationships of the first component, the second component and the pipeline are adjusted, thereby forming a graphical first model of the complete circulating cooling water system, such as Figure 3 The example shown is an example of the first model finally generated.

[0042] Figure 3 In the figure, it is the first graphical model of a circulating cooling water system of an industrial enterprise. The circulating cooling water system is equipped with three cooling water towers with a rated cooling water capacity of 5000m³ / h, three electric water pumps with a flow rate of 10800m³ / h and a head of 55m. The circulating water of the whole plant is supplied to each device by the DN2400 main line of the circulating water field, and after heat exchange in the heat exchanger, it is sent to the cooling tower through the return water pipeline for cooling, completing the circulation of the whole system.

[0043] First, the structural information of the circulating cooling water system is obtained, and based on the pre-established component library and the pipeline library, the first model is automatically generated in the model building area in response to the obtained structural information of the circulating cooling water system, thereby completing the construction of the first model. The structure of the circulating cooling water system is displayed in a graphical manner, which is convenient for users to understand and analyze.

[0044] Since in this embodiment, the circulating cooling water system is decomposed and refined into the first component, the second component and the pipeline, it is convenient to expand the first model, and the scale and function of the first model can be easily expanded. By simply increasing or decreasing the number of the required first component, the second component and the pipeline, adjusting the positions of the first component, the second component and the pipeline, and changing the types of the first component, the second component and the pipeline, the graphical first model corresponding to the circulating cooling water system with different structural compositions can be obtained, such as adding a new cooling tower or circulating water pump to meet higher cooling requirements. The method of this embodiment greatly improves the scalability and flexibility of the model, and can more easily adjust the first model, that is, to realize the transformation and upgrade planning of the circulating cooling water system.

[0045] S2: Determine the parameters and state data and environmental condition data corresponding to the first graphical model After generating the graphical first model, further determine the parameters and status data corresponding to the first model, including the parameters and status data of each of the first component, the second component and the pipeline, wherein the status data refers to the operating status, including opening and closing and faults.

[0046] The parameters and status data of the first component are as follows: When the first component is a cooling tower, it includes the processing capacity and fan power data of the cooling tower; When the first component is a water pump, it includes the head curve, efficiency curve and frequency data of the water pump; When the first component is a heat exchanger, it includes data on the number of tubes, number of tube passes, inner diameter (wall thickness) of the tubes, length of the tubes, number of baffles, baffle spacing, shell diameter, and tube spacing of the heat exchanger.

[0047] The parameters and status data of the second component are as follows: When the second component is a regulating valve, it includes the flow coefficient, opening, adjustable ratio coefficient, and flow characteristics of the regulating valve.

[0048] Examples of the parameters and status data of the pipeline are as follows: including the inner diameter of the pipeline, the length of the pipeline, the roughness of the pipe wall, the laying method, and the burial depth.

[0049] Examples of the environmental condition data are as follows: atmospheric pressure, ambient temperature, ambient humidity, wet-bulb temperature, and dry-bulb temperature.

[0050] Further, receiving an instruction to edit the properties of the first component, the second component, and the pipeline, setting the parameters and status data of the first component, the second component, and the pipeline, thereby determining the parameters and status data of the first component, the second component, and the pipeline; receiving an instruction to set the environmental condition, setting the environmental condition data, thereby determining the environmental condition data. In one example, referring to Figure 2 , the parameters and status data of the first component, the second component and the pipeline can be set through the property editing window; the environmental condition data of the first model can be set through the setting window.

[0051] By adjusting the parameters and state data of the first model, the construction of the first model of the circulating cooling water system under different working conditions can be achieved, so as to simulate the circulating cooling water system under different working conditions.

[0052] S3, generating an equation-based second model based on the graphical first model and the corresponding parameters, state data and environmental condition data Specifically, the second model in the form of an equation is automatically generated based on the first component, the second component, the pipeline and the connection relationship between them in the first model, as well as the parameter and status data of each of the first component, the second component and the pipeline, and the environmental condition data.

[0053] Furthermore, the second model is an equation set composed of multiple equations. The graphical first model is parsed to identify the first component, the second component and the pipeline in the first model, and the equation is automatically generated according to the first component, the second component, the pipeline and the connection relationship therebetween, as well as the parameters and state data of each of the first component, the second component and the pipeline, and the environmental condition data, to express the mechanism of the circulating cooling water system, thereby improving the efficiency of constructing the second model.

[0054] Specifically, a second model is constructed based on the laws of physics and the principles of thermodynamics and kinetics, and the second model includes a mass conservation equation, an energy conservation equation, a pipeline pressure drop equation, a pipeline heat dissipation equation, a heat transfer equation for a heat exchanger, a pressure drop equation for the tube side and shell side of a shell and tube heat exchanger, a pressure drop equation for the hot and cold sides of a plate heat exchanger, and / or a heat transfer equation for a cooling tower. The specific configuration of the equation is already known in the prior art, and the equation is not listed in this embodiment. For example, the relationship between the flow rate and the head of a water pump can be described by the Euler equation.

[0055] As in one example, in a simplified first model, when the two first components are connected by the pipeline through the second component and the parameters and state data and environmental condition data corresponding to the first model are determined, a second model including fluid mechanics equations and heat transfer equations is automatically generated.

[0056] The first component, the second component and the equations related to the pipeline are combined to obtain a complete set of equations to generate the second model. The set of equations is used to describe the operation of the entire circulating cooling water system.

[0057] The circulating cooling water system mechanism model construction method of this embodiment generates a mechanism model through the assistance of a graphical interface. Through the graphical interface, the first component, the second component, the pipeline and their connection relationship of the circulating cooling water system can be intuitively displayed, and then information can be automatically extracted from the graphical first model to generate the second model containing the mechanism equation, thereby simplifying the construction process of the second model.

[0058] Furthermore, the second model formulated as an equation is verified to improve the accuracy and reliability of the second model.

[0059] After quickly generating an equation-based second model based on the graphical first model, the accuracy and reliability of the second model need to be verified to improve the simulation accuracy of the second model.

[0060] Specifically, the second model is verified by comparing the model calculated value and the measured value of a specific parameter, and it is determined whether the second model needs to be adjusted according to the verification result. If the verification result meets the requirements, the second model is not adjusted; if the verification result does not meet the requirements, the second model is adjusted. When the second model needs to be adjusted, it can be adjusted using the model adjustment parameters, which include the pipeline pressure drop factor, the pressure drop factor on the hot and cold sides of the heat exchanger, and the heat transfer factor. Of course, the model adjustment parameters can also be other parameters that improve the accuracy and reliability of the second model. Among them, in one case, the pressure drop factor refers to the ratio of the fluid pressure drop and the flow rate per unit length. The pressure drop of the fluid flowing in a straight pipe can be calculated using Darcy's formula; the heat transfer factor is used to describe the intensity of heat conduction inside an object, and is defined as the ratio of the heat passing through a unit area per unit time to the temperature difference inside the object. The size of the heat transfer factor directly affects the thermal conduction efficiency of the object.

[0061] For example, for the circulating water flow of a heat exchanger, the second model is first used to calculate to obtain the calculated value of the circulating water flow of the heat exchanger, and then the calculated value is verified by actual measurement. The actual measurement of the circulating water flow of the heat exchanger can be directly carried out using on-site instruments or other external measuring equipment, without limiting the actual measurement tools.

[0062] Compare the calculated value and the measured value of the circulating water flow rate of the heat exchanger to determine whether the second model meets the requirements. Preferably, the relative error between the calculated value and the measured value is calculated to determine whether the second model meets the requirements. When the relative error between the calculated value and the measured value is not higher than the set threshold, it can be determined that the second model meets the requirements and the second model is confirmed to be available; when the relative error between the calculated value and the measured value is higher than the set threshold, it can be determined that the second model does not meet the requirements and needs to be adjusted through the model adjustment parameters. After that, the circulating water flow rate of the heat exchanger is calculated again using the adjusted second model, the relative error between the adjusted calculated value and the measured value is calculated, and the relative error obtained after the adjustment is used to determine whether the second model meets the requirements.

[0063] The threshold value may be set according to the actual accuracy of the circulating cooling water system, which is not limited in this embodiment, such as ±1%, ±2% or ±3%.

[0064] Through the above verification, the accuracy and reliability of the generated second model are ensured, so that the results of subsequent analysis using the second model are closer to the actual results.

[0065] Furthermore, after verifying that the second model meets the requirements, a performance analysis is performed on the second model to solve the operating status of the circulating cooling water system. Specifically, by setting performance indicators and using a performance analysis algorithm to perform performance analysis on the second model, the performance of the second model is judged based on the performance analysis results. If the performance indicator is good, it means that the circulating cooling water system corresponding to the second model can meet the indicator requirements and can be used for production; if the performance indicator is poor, it means that the circulating cooling water system corresponding to the second model is prone to problems after operation and needs further optimization. The performance analysis algorithm in this embodiment adopts an existing algorithm, which is not listed and described here.

[0066] Of course, when the circulating cooling water system corresponding to the second model can meet the index requirements, if there is a need to further improve the performance, it can also be further optimized to obtain better operating conditions.

[0067] This embodiment performs simulation based on a mechanism model that can represent the operation of the circulating cooling water system, and can accurately reflect the actual performance and dynamic changes of the circulating cooling water system.

[0068] In a feasible embodiment, the generated second model may not be verified, that is, the verification step is skipped and the performance analysis of the second model is directly performed.

[0069] When it is necessary to optimize the circulating cooling water system corresponding to the second model, the optimization goal and constraints can be set and then the optimization algorithm can be used for optimization. The target optimization can be single-target optimization or multi-target optimization. The optimization goal can be cost minimization or other goals. Through optimization, an improvement plan for the circulating cooling water system corresponding to the second model is obtained, and the circulating cooling water system is adjusted according to the improvement plan to achieve the best operating conditions. The adjustment of the circulating cooling water system includes adjusting the structure of the circulating cooling water system and / or adjusting the structural related data of the circulating cooling water system. The optimization algorithm in this embodiment adopts an existing algorithm. Through optimization, the operating state and parameters of each component or pipeline can be accurately controlled to reduce unnecessary energy consumption. For example, the speed and flow rate of the circulating water pump are adjusted according to the optimization results to achieve water supply on demand; the heat exchange efficiency of the cooling tower is optimized, and the head and efficiency of the circulating water pump are improved.

[0070] When the structure of the circulating cooling water system needs to be adjusted, the steps S1-S3 are performed again, firstly the first model after the structure adjustment is generated, then the second model is generated based on the first model, after the second model is verified, the obtained second model is analyzed again, and the performance index of the second model is calculated; When only the structural related data of the circulating cooling water system need to be adjusted, there is no need to regenerate the first model. Steps S2-S3 are executed. After the new structural related data are determined, the second model will be automatically refreshed to generate an adjusted second model. The new second model replaces the old second model. After the new second model is verified, the obtained second model is analyzed again to calculate the performance indicators of the second model.

[0071] When performing performance analysis and optimization, performance analysis and optimization can be performed on specific components or pipelines.

[0072] Furthermore, the performance analysis results and optimization solutions for the second model are output, and the user can view and process them according to the output results.

[0073] The method for constructing a circulating cooling water system mechanism model of the present application starts from the structural information of the circulating cooling water system, first generates a graphical first model, and then constructs an equation-based second model based on the first model and its corresponding parameters, state data and environmental condition data. This process not only improves the understanding of the operation of the circulating cooling water system and the efficiency of model construction, but also provides a powerful tool for subsequent system optimization, fault diagnosis and energy efficiency improvement.

[0074] Embodiment 2 As another specific embodiment of the present application, this embodiment illustrates a method for constructing a circulating cooling water system mechanism model and its effects by providing specific examples.

[0075] Figure 4 The schematic diagram of the olefin separation part of the first model of the circulating cooling water system of a chemical enterprise is shown in Figure 1. In this model, the propylene refrigerant condensers E701A and E701B (circled in dotted circles in the figure) are at the end of the olefin separation branch line, with a small circulating water volume, a large temperature rise, and easy scaling.

[0076] After the second model is obtained according to the method for constructing the mechanism model of the circulating cooling water system in Example 1, the generated second model is simulated and analyzed, and the following problems exist: when the circulating water supply temperature is 27°C in summer, the scale is 0.1mm, and the propylene load decreases by 4.9%; when the scale is 0.2mm, the load decreases by 12.6%. When the circulating water supply temperature is higher, the load will continue to decrease, and the load of the entire plant will be affected and need to be reduced. The summer operating conditions are in a low-load operation state for two months.

[0077] In view of the above problems, the circulating cooling water circulation system is optimized, and the optimization scheme is as follows: Connect two sections of DN900 pipeline from the olefin separation inlet main line, connect E701A / B to the new water supply and return pipeline, and disconnect the original pipeline at the same time.

[0078] In this example, the structure of the circulating cooling water system is modified and adjusted. Therefore, the first model needs to be generated again, and the second model is generated based on the first model. Finally, the performance indicators of the adjusted second model are improved by analyzing the following: After the transformation, the circulating water volume of E701A / B increased from 1080t / h to 1640t / h, the flow rate increased, the temperature difference decreased, and the scaling trend was greatly delayed. When the circulating water supply temperature was 28℃, the scaling was 0.2mm, and the cooling task could be completed, which greatly reduced the low-load operation time and brought huge economic benefits.

[0079] Figure 5The schematic diagram of the first model of the methanol-to-olefins part of the circulating cooling water system of a chemical enterprise is shown in Figure 1. After the circulating water enters the methanol-to-olefins unit, it first enters the sewage stripping tower top water heat exchanger E1207A / B, then enters the wash water heat exchangers E1204A~F and E1205A~F, and finally enters the purified water heat exchanger E1209A / B.

[0080] After the second model is obtained according to the method for constructing the mechanism model of the circulating cooling water system in Example 1, the generated second model is simulated and analyzed, and the following problems exist: the circulating water consumption of E1207A / B is about 2438.5t / h, and the circulating water temperature rise is 0.9℃; the circulating water consumption of E1204A~F is about 3691.6t / h, and the circulating water temperature rise is 5.0℃; the circulating water consumption of E1205A~F is about 3445.3t / h, and the circulating water temperature rise is 5.3℃; the circulating water consumption of E1209A / B is about 1608.1t / h, and the circulating water temperature rise is 1.5℃. E1207A / B is the first user of the methanol to olefin branch line, with high pressure, large pipe diameter, and large heat exchanger, so the circulating water flow is large and the temperature rise is small; the circulating water of E1209A / B is in the pipe route, with large flow, fast flow rate, and only 3.3℃ temperature difference. The larger circulating water flow has little effect on cooling. For E1204A~F and E1205A~F, the flow velocity on the circulating water side is high and the temperature difference is small. Through simulation, it is found that the circulating water volume has little effect on the heat transfer effect.

[0081] In view of the above problems, the circulating cooling water circulation system is optimized, and the optimization scheme is as follows: E1204A~F and E1205A~F: Adjust the cold heat exchanger port or inlet valve to control the circulating water flow rate to about 400~500t / h. At this time, the tube flow velocity is 1.23~1.61m / s, and the temperature rise can be increased by about 2.5℃; E1207A / B: The circulating water flow rate is controlled at 300t / h, the tube flow velocity is 0.47m / s, the circulating water temperature rises to 4.3℃, and the outlet temperature of the cold side purified water rises only by 0.1℃, which does not affect the process; E1209A / B: The regulating valve controls the circulating water flow rate of each heat exchanger at 400t / h. After adjustment, the pipe flow velocity is 0.81m / s, the circulating water temperature rises to 5.8℃, and the purified water outlet temperature is 37.5℃, which is only 1.5℃ higher than that without flow control.

[0082] This example only involves the modification and adjustment of the parameters of some components of the circulating cooling water system, and does not involve the adjustment of the physical structure of the circulating cooling water system. Therefore, there is no need to generate the first model again. The second model can be directly generated based on the original first model, and finally the adjusted second model is analyzed. From the analysis results, the performance indicators have been improved: By closing the circulating water outlet valve of the wash water heat exchanger and adjusting the water inlet valves of the E1207A / B and E1209A / B heat exchangers, the circulating water consumption was reduced from 15,000 t / h to 9,000 t / h, and the circulating water temperature difference was increased from 3.5°C to 6.8°C. The circulating water price was calculated at 0.23 yuan / t and the annual operating time was 8,000 hours, which can achieve an annual economic benefit of 11.04 million yuan.

[0083] Figure 6 The schematic diagram of the air separation and air compression part of the first model of the circulating cooling water system of a chemical enterprise is constructed. The air separation unit is at the end of the circulating cooling water system of the whole plant. The waste heat regeneration dryer aftercooler and compressed air cooler inside the unit cannot be cooled under summer conditions, which is prone to overheating and affects production. Before the modeling and simulation method of this application was used, in order to solve the above problems, two booster pumps were added after the circulating water entered the unit to increase the circulating water volume. There was no relief effect after adding the booster pumps.

[0084] After obtaining the second model according to the method for constructing the mechanism model of the circulating cooling water system in Example 1, the generated second model was simulated and analyzed, and it was found that the reason why the waste heat regeneration dryer could not be cooled was that the shell side heat transfer coefficient was too small, so it could not complete the cooling load after scaling. Increasing the circulating water volume did not improve much, and it was an ineffective transformation; the compressed air cooler was at the farthest end of the entire circulating water system, with a small flow rate, a large temperature rise, a large average logarithmic temperature difference, and was very sensitive to scaling. Therefore, when the circulating water supply temperature is high, a slight scaling will cause overtemperature.

[0085] In view of the above problems, the circulating cooling water circulation system is optimized, and the optimization scheme is as follows: For the aftercooler of the waste heat regeneration dryer, increasing the heat exchange area and connecting a cooler in series can reduce the outlet temperature of the hot material; For the compressed air cooler, (1) the diameter of the main circulating water pipeline entering the air compressor station is expanded to DN500, and the diameter of the cooler branch pipeline is expanded to DN250. The circulating water volume entering the heat exchanger is increased by 12%, and the outlet air temperature can be reduced by 1°C; (2) a DN500 air compressor station double line is added, and the total water volume of the air compressor station is increased to 918.4t / h. The average outlet air temperature of the instrument compressed air heat exchanger is reduced by 2°C. The combination of (1) and (2) can reduce the outlet temperature of compressed air by 3°C.

[0086] It can be seen that by using the model obtained by the circulating cooling water system mechanism model construction method of the present application for simulation analysis and optimization, problems existing in the system can be discovered in a timely manner, and targeted optimization can be performed to improve the system's operating performance, reduce energy consumption, and save costs.

[0087] Embodiment 3 As a specific embodiment of the present application, this embodiment provides a circulating cooling water system mechanism model construction device, which is used to implement the circulating cooling water system mechanism model construction method described in embodiments one and two, referring to Figure 7 , including a first model generating module 100, a data determining module 200, and a second model generating module 300.

[0088] The first model generation module 100 is used to obtain structural information of the circulating cooling water system and generate a graphical first model in response to the structural information; The data determination module 200 is used to determine the parameters, state data and environmental condition data corresponding to the first graphical model, and allow the parameters, state data and environmental condition data corresponding to the first model to be adjusted to achieve the replacement of different working conditions; The second model generating module 300 is used to generate an equation-based second model based on the graphical first model and the corresponding parameters, state data and environmental condition data.

[0089] The structure of the circulating cooling water system includes a first component, a second component, and a pipeline connecting the components, and the structural information of the circulating cooling water system includes first component information, second component information, pipeline information, and connection relationship information between the first component, the second component, and the pipeline. The circulating cooling water system is composed of a plurality of the first components, the second components, and the pipelines.

[0090] The first model generation module 100 includes a component library containing the first component and the second component, a pipeline library containing pipelines, and a graphical model building area. The first graphical model is generated by dragging and moving the first component, the second component, and the pipeline from the component library and the pipeline library to the model building area.

[0091] The data determination module 200 includes a property editing unit and a setting unit. The property editing unit can be used to set the parameters and state data of the first component, the second component and the pipeline. The setting unit can be used to set the environmental condition data of the first model.

[0092] The second model generation module 300 generates the second model based on the first model generated by the first model generation module 100 and the parameters and status data corresponding to the first model determined by the data determination module 200, as well as the environmental condition data. Specifically, the first component, the second component and the pipeline in the first model are identified by parsing the graphical first model, and then the equation-based second model is automatically generated based on the first component, the second component, the pipeline and the connection relationship between them, as well as the parameters and status data and the environmental condition data of each of the first component, the second component and the pipeline.

[0093] Furthermore, the device also includes a second model verification module 400 , a performance analysis module 500 and an optimization module 600 .

[0094] The second model verification module 400 is used to verify the second model by comparing the simulated calculated value and the measured value of the second model, and determine whether to adjust the second model according to the verification result. If the verification result meets the requirements, the second model is not adjusted; if the verification result does not meet the requirements, the second model is adjusted using the model adjustment parameters. The model adjustment parameters include pipeline pressure drop factor, pressure drop factor on both sides of the heat exchanger, and heat transfer factor.

[0095] The performance analysis module 500 is used to solve the operating status of the circulating cooling water system, use a performance analysis algorithm to perform performance analysis on the second model, and provide a performance analysis result, which is an analysis result of a performance indicator.

[0096] The optimization module 600 is used to optimize the circulating cooling water system and obtain an optimization solution for the circulating cooling water system.

[0097] Furthermore, the device also includes a result display module 700, which is used to output the performance analysis results and optimization solutions for the second model, and display the performance analysis results and the optimization solutions for users to view and select.

[0098] Embodiment 4 As a specific embodiment of the present application, this embodiment provides a computer electronic device, including a memory, a processor and a computer program stored on the memory, and the processor executes the computer program to implement the steps of the method for constructing a circulating cooling water system mechanism model described in Example 1.

[0099] Embodiment 5 As a specific embodiment of the present application, this embodiment provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the steps of the method for constructing a circulating cooling water system mechanism model described in Example 1 are implemented.

[0100] The circulating cooling water system mechanism model construction method, device, equipment and storage medium of the present application can be applied to circulating cooling water systems of various sizes and types, and has broad application prospects.

[0101] The above is only a preferred embodiment of the present application and does not constitute any other form of limitation to the present application. Any modification or equivalent change made based on the technical essence of the present application still falls within the scope of protection required by the present application.

Claims

1. A method for constructing a circulating cooling water system mechanism model, characterized in that: The method comprises: Acquiring structural information of a circulating cooling water system, and generating a graphical first model in response to the structural information, wherein the structure of the circulating cooling water system includes a first component, a second component, and a pipeline connecting the first component and the second component; the structural information of the circulating cooling water system includes first component information, second component information, pipeline information, and connection relationship information between the first component, the second component, and the pipeline; generating the graphical first model in response to the structural information based on a pre-established component library including the first component and the second component and a pipeline library including the pipeline; Determine the parameters and state data and environmental condition data corresponding to the first graphical model, wherein the parameters and state data corresponding to the first model include the parameters and state data of the first component, the second component and the pipeline, and receive settings and adjustments to the parameters and state data of the first component, the second component and the pipeline to determine the parameters and state data and environmental condition data corresponding to the first graphical model; Based on the graphical first model and the corresponding parameters, status data and environmental condition data, an equation-based second model is generated, wherein the graphical first model is analyzed to identify the first component, the second component and the pipeline of the first model, and the connection relationship between the first component, the second component, the pipeline and the first component, the second component and the pipeline, the parameters and status data of the first component, the second component and the pipeline, and the environmental condition data are used to generate the equation-based second model representing the operating mechanism of the circulating cooling water system.

2. The method for constructing a circulating cooling water system mechanism model according to claim 1, characterized in that: The generating of the first graphical model in response to the structural information based on a pre-established component library including the first component and the second component and a pipeline library including the pipeline includes performing a filtering operation in the component library and the pipeline library according to the structural information, receiving the filtering operation and combining the filtered first component, the second component and the pipeline to generate the first graphical model.

3. The method for constructing a circulating cooling water system mechanism model according to claim 2, characterized in that: The receiving of the filtering operation and combining the filtered first component, the second component and the pipeline to generate the graphical first model includes dragging the filtered first component, the second component and the pipeline to a model building area, combining the first component, the second component and the pipeline in the model building area to generate the graphical first model.

4. The method for constructing a circulating cooling water system mechanism model according to claim 1, characterized in that: The generating of the first graphical model in response to the structural information based on a pre-established component library including the first component and the second component and a pipeline library including the pipeline includes determining, based on the structural information, whether there are components and / or pipelines required for generating the first model in the component library and the pipeline library, and expanding the component library and / or the pipeline library if the required components and / or pipelines do not exist in the pre-established component library and / or the pipeline library.

5. The method for constructing a circulating cooling water system mechanism model according to claim 1, characterized in that: The determining of the parameters and state data and the environmental condition data corresponding to the graphical first model includes receiving settings for the environmental condition data of the first model to determine the environmental condition data of the first model.

6. The method for constructing a circulating cooling water system mechanism model according to claim 1, characterized in that: Based on the graphical first model and the corresponding parameters, state data and environmental condition data, generating an equation-based second model includes generating an equation set consisting of equations corresponding to the first component, the second component and the pipeline, the equation set including the mass conservation equation, the energy conservation equation, the pipeline pressure drop equation, the pipeline heat dissipation equation, the heat transfer equation of the heat exchanger, the pressure drop equation for the tube side and the shell side of the shell and tube heat exchanger, the pressure drop equation for the hot and cold sides of the plate heat exchanger and / or the heat transfer equation of the cooling tower.

7. The method for constructing a circulating cooling water system mechanism model according to claim 1, characterized in that: After generating an equation-based second model based on the graphical first model and the corresponding parameters, state data and environmental condition data, the second model is verified and / or performance analyzed, and the second model is adjusted according to the verification and / or performance analysis results.

8. A circulating cooling water system mechanism model construction device, characterized in that: It comprises a first model generation module (100), a data determination module (200), and a second model generation module (300); The first model generation module (100) is used to obtain structural information of a circulating cooling water system and generate a graphical first model in response to the structural information, wherein the structure of the circulating cooling water system includes a first component, a second component, and a pipeline connecting the first component and the second component; the structural information of the circulating cooling water system includes first component information, second component information, pipeline information, and connection relationship information between the first component, the second component, and the pipeline; based on a pre-established component library including the first component and the second component and a pipeline library including the pipeline, the graphical first model is generated in response to the structural information; The data determination module (200) is used to determine the parameters and state data and environmental condition data corresponding to the first graphical model, wherein the parameters and state data corresponding to the first model include the parameters and state data of the first component, the second component and the pipeline, and receive the setting and adjustment of the parameters and state data of the first component, the second component and the pipeline to determine the parameters and state data and environmental condition data corresponding to the first graphical model; The second model generation module (300) is used to generate an equation-based second model based on the graphical first model and the corresponding parameters, status data and environmental condition data, wherein the graphical first model is parsed to identify the first component, the second component and the pipeline of the first model, and the equation-based second model representing the operating mechanism of the circulating cooling water system is generated based on the connection relationship between the first component, the second component, the pipeline and the first component, the second component and the pipeline, the parameters and status data of the first component, the second component and the pipeline and the environmental condition data.

9. A computer electronic device comprising a memory, a processor and a computer program stored in the memory, characterized in that: The processor executes the computer program to implement the steps of the method according to any one of claims 1 to 7.

10. A computer-readable storage medium having a computer program stored thereon, 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 7 are implemented.

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