Graphical mechanism modeling method and system for steam power system based on point-line-plane topological structure

Abstract

The invention provides a steam power system graphical mechanism modeling method and system based on a point-line-plane topological structure, and belongs to the technical field of steam power system modeling, and the method comprises the following steps: constructing a steam power system graphical model based on the point-line-plane topological structure by using a pre-established component library and a graph drawing tool; obtaining and determining model parameters of the constructed steam power system graphical model based on the point-line-plane topological structure; generating a mechanism model according to the constructed steam power system graphical model based on the point-line-plane topological structure and the determined model parameters; on the basis of actual measurement data and calculation data obtained by utilizing the generated mechanism model, verifying the mechanism model; and performing performance analysis on the verified mechanism model, and performing optimization according to a performance analysis result. The accuracy and reliability of the model can be remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of steam power system modeling, and in particular to a method and system for graphical mechanism modeling of a steam power system based on a point-line-surface topological structure. Background Art

[0002] Steam power system is an energy conversion system that uses steam as a working medium, drives the steam turbine to rotate, and then drives the generator to generate electricity or mechanical equipment to operate. The steam power system is very large and complex and is widely used in the industrial field. In the process of production development, it is often necessary to transform and upgrade the original steam power system. For example, CN106529710A discloses a steam power system optimization method based on marginal cost accounting. However, in some industrial enterprises, especially for some old factories, in the process of continuously expanding the scale of production, the steam power system is often "filled in" measures, resulting in unreasonable conditions in the steam power system from the pipe network structure to the equipment configuration. In particular, the pipe network structure, after the transformation year by year, forms a complex structure with multiple rings and multiple levels. In addition, there is a lack of temperature, pressure, flow and other measurement points inside the pipe network, which has caused the management work to rely largely on experience, and there is blindness in the adjustment of steam supply process and parameters, and even the steam flow direction and flow are unclear, and the quality is reduced. The phenomenon of venting cannot be curbed, resulting in a great waste of energy.

[0003] In order to better understand the working conditions of steam power systems, evaluate heat loss, improve energy utilization, and save energy, graphical modeling technology is gradually introduced into steam power systems. However, the application of existing graphical modeling methods in steam power systems still has some shortcomings, which makes it difficult to ensure the accuracy and reliability of the model.

[0004] Therefore, how to improve the accuracy and reliability of graphical modeling in steam power systems has become a technical problem that needs to be solved urgently. Summary of the invention

[0005] In view of the above problems, the present invention provides a method and system for graphical mechanism modeling of a steam power system based on a point-line-surface topological structure, so as to overcome the deficiencies of the prior art and realize efficient, accurate, reliable and intuitive steam power system modeling.

[0006] The present invention provides a graphical mechanism modeling method for a steam power system based on a point-line-surface topological structure, comprising: Using a pre-established component library and a graphics drawing tool, a graphical model of a steam power system based on a point-line-surface topological structure is constructed, wherein the point-line-surface topological structure includes point components, equipment components, and pipelines connecting the point components and equipment components of the steam power system; Acquire and determine model parameters of the constructed graphical model of the steam power system based on the point-line-surface topological structure, wherein the model parameters include component parameters and operating environment parameters; Generate a mechanism model according to the constructed graphical model of the steam power system based on the point-line-surface topological structure and the determined model parameters; Based on the measured data and the calculated data obtained by using the generated mechanism model, the mechanism model is verified, wherein when the difference between the measured data and the calculated data is greater than a set threshold, the mechanism model is corrected until the difference between the measured data and the calculated data is no greater than the set threshold; The verified mechanism model is subjected to performance analysis and optimized according to the performance analysis results.

[0007] As a further improvement of the present invention, the method of using a pre-established component library and a graphic drawing tool to construct a graphical model of a steam power system based on a point-line-surface topological structure includes: Select the components required for the points and surfaces in the component library, place the components to the corresponding positions in the graphical interface by dragging, and adjust the sizes of the components according to actual conditions to form the points and surfaces in the topological structure; Using the graphic drawing tool to draw the connection relationship between components to form lines in the topological structure; The connection relationship, position and direction of the points, lines and surfaces are adjusted to complete the construction of the graphical model of the steam power system based on the point-line-surface topological structure.

[0008] As a further improvement of the present invention, the graphic drawing tool includes a point drawing tool, a line drawing tool and a surface drawing tool, which are respectively used for drawing point components, pipelines and device components in the topological structure.

[0009] As a further improvement of the present invention, the mechanism model includes a mass conservation equation, an energy conservation equation, a pipeline pressure drop equation, a pipeline heat dissipation equation, a turbine work equation, a boiler counter-balance efficiency equation, and a temperature layer heat transfer coefficient calculation equation and a heat exchanger heat transfer coefficient calculation equation.

[0010] As a further improvement of the present invention, the verification of the mechanism model based on the measured data and the calculated data obtained by using the generated mechanism model includes determining whether to correct the mechanism model according to the relative error between the measured data and the calculated data, and when the relative error between the measured data and the calculated data is greater than ±5%, the mechanism model is corrected until the relative error between the measured data and the calculated data is no greater than ±5%.

[0011] As a further improvement of the present invention, when the relative error between the measured data and the calculated data is greater than a set threshold, it is first determined whether the measured data is correct. If the measured data is determined to be correct, the mechanism model is corrected.

[0012] As a further improvement of the present invention, the verification of the mechanism model based on measured data and calculated data obtained by using the generated mechanism model includes correcting the mechanism model using a pressure drop factor, an insulation layer efficiency reduction factor, and an insulation layer exposure factor.

[0013] As a further improvement of the present invention, the performance analysis of the verified mechanism model and optimization based on the performance analysis results include predetermining multiple performance indicators, performing performance analysis on the mechanism model using a performance analysis algorithm, and obtaining analysis results of the multiple performance indicators.

[0014] As a further improvement of the present invention, the performance analysis of the verified mechanism model and the optimization according to the performance analysis result include setting optimization goals and constraints, and optimizing the mechanism model using an optimization algorithm.

[0015] The present invention provides a graphical mechanism modeling system for a steam power system based on a point-line-surface topological structure, comprising a graphical model building module, a model parameter determination module, a mechanism model generation module, a mechanism model verification module, and a performance analysis and optimization module, wherein: The graphical model building module is used to build a graphical model of the steam power system based on a point-line-surface topological structure; The model parameter determination module is used to obtain and determine the model parameters of the constructed steam power system graphical model based on the point-line-surface topological structure; The mechanism model generation module is used to generate a mechanism model according to the constructed graphical model of the steam power system based on the point-line-surface topological structure and the determined model parameters; The mechanism model verification module is used to verify the mechanism model based on measured data and calculated data obtained by using the generated mechanism model; The performance analysis and optimization module is used to perform performance analysis on the verified mechanism model and perform optimization according to the performance analysis results.

[0016] As a further improvement of the present invention, the system also includes a result output module for outputting and displaying the performance analysis results and optimization solutions, and generating report documents.

[0017] The present invention provides a graphical mechanism modeling method and system for a steam power system based on a point-line-surface topological structure, which has the following beneficial effects: 1. By constructing a graphical model of a steam power system based on a point-line-surface topological structure, and generating a mechanism model according to the constructed graphical model of a steam power system based on a point-line-surface topological structure and the determined model parameters, the mechanism model is then corrected based on measured data and calculated data obtained using the generated mechanism model, so that the accuracy and reliability of the finally obtained model are significantly improved; 2. Through the graphical interface, users can intuitively build a model of the steam power system and clearly display the structure and operating principle of the steam power system; 3. The graphical model of the steam power system based on the point-line-surface topological structure has good scalability. Users can freely adjust the parameters and structure of the model as needed to meet the modeling needs of steam power systems of different scales and complexities; 4. Generate a mechanism model based on the constructed graphical model of the steam power system based on the point-line-surface topological structure and the determined model parameters to improve modeling efficiency and obtain the mechanism model equation more quickly. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a flow chart of a method for graphical mechanism modeling of a steam power system based on a point-line-surface topological structure according to an embodiment of the present invention.

[0019] Figure 2 It is a schematic diagram of a model obtained by graphical modeling of a steam power system according to a graphical mechanism modeling method of a steam power system based on a point-line-surface topological structure according to an embodiment of the present invention.

[0020] Figure 3 It is a schematic diagram of software implementation of a graphical mechanism modeling method for a steam power system based on a point-line-surface topological structure according to an embodiment of the present invention.

[0021] Figure 4 It is a structural schematic diagram of a graphical mechanism modeling system for a steam power system based on a point-line-surface topological structure according to an embodiment of the present invention.

[0022] Figure 5 It is a schematic diagram of a graphical model of a steam power system based on a point-line-surface topological structure according to an example of an embodiment of the present invention.

[0023] Explanation of the accompanying drawings: 1. Graphical model construction module; 2. Model parameter determination module; 3. Mechanism model generation module; 4. Mechanism model verification module; 5. Performance analysis and optimization module; 6. Result output module. DETAILED DESCRIPTION

[0024] The following is combined with specific embodiments and appendix Figure 1-5The invention is described in detail so that those skilled in the art can more fully understand the purpose, features and effects of the invention.

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

[0026] The present invention provides a method and system for graphical mechanism modeling of a steam power system based on a point-line-surface topological structure. The generated graphical mechanism model has high accuracy and reliability, and can provide a reliable basis for performance analysis and optimization of the steam power system.

[0027] Embodiment 1 As a specific embodiment of the present invention, this embodiment provides a graphical mechanism modeling method for a steam power system based on a point-line-surface topological structure, referring to Figure 1 , Figure 2 , the specific steps are as follows: S100, build a graphical model of the steam power system based on point-line-surface topological structure In this embodiment, Figure 2 The construction of the graphical model of the steam power system shown is used as an example.

[0028] Use pre-built component libraries and graphics drawing tools to build a graphical model of the steam power system based on point-line-surface topology.

[0029] Specifically, the point-line-plane topological structure includes points, lines and planes, wherein: The points represent key point components in the steam power system, including but not limited to starting points, end points, elbows, reducers, instruments, and stop valves. Each point has specific attributes, such as component type, parameters, and status.

[0030] The lines represent the connection relationship between components in the steam power system, including but not limited to steam pipelines, water pipelines, and energy flow pipelines. Each line has specific properties, such as pipeline diameter, length, material, roughness, insulation material, and insulation thickness.

[0031] The face represents the equipment components of the steam power system, including but not limited to boilers, steam drums, single-stage steam turbines, multi-stage steam turbines, power generation steam turbines, condensers, deaerators, heaters, desuperheaters, desuperheaters and pressure reducers, and feedwater pumps. The equipment is set with connection points, and different equipment has different connection points. The connection points are divided into access points and access points. Each face has specific attributes.

[0032] In the point-line-surface topological structure, different "surfaces" are connected to "lines" from connection points, and "lines" are connected by "points". Through the point-line-surface topological structure of this embodiment, the composition and connection relationship of the steam power system can be clearly and intuitively displayed, and a graphical model of the steam power system can be better constructed.

[0033] In this embodiment, since both points and surfaces represent components, when dividing, accurate division can be performed according to actual conditions and purposes, so that all components used in the model construction process can be attributed to corresponding points or surfaces.

[0034] Further, refer to Figure 3 A drawing area is provided in the graphical interface. By dragging components in the pre-established component library to the drawing area and using the graphic drawing tool to draw points, lines or surfaces in the drawing area, a graphical model of the steam power system based on the point-line-surface topological structure is constructed. Figure 3 The graphical model of the steam power system shown identifies some components in the graphical model of the steam power system.

[0035] Various common steam power system components are pre-established in the component library, such as different types of boilers, steam turbines, condensers, and pumps. When constructing the graphical model of the steam power system based on the point-line-surface topological structure, the required components can be selected from the component library and placed in the corresponding position in the drawing area by dragging. Preferably, the size of the components in the drawing area is adjustable and the position is movable.

[0036] The graphic drawing tool includes a point drawing tool, a line drawing tool and a surface drawing tool, and the required points, lines or surfaces can be obtained by drawing in the drawing area. When the required component is not included in the component library, the required component can be obtained by drawing with the graphic drawing tool, such as selecting a point drawing tool or a surface drawing tool to draw the required component as needed.

[0037] By pre-establishing a component library and providing a wealth of graphics drawing tools, using an intuitive and easy-to-use graphical interface, the graphical model of the steam power system based on the point-line-surface topological structure can be quickly constructed.

[0038] Specifically, in one example, the graphical model of the steam power system based on the point-line-surface topological structure is constructed by the following steps: S101, selecting components required for points and surfaces in the component library, placing the components to corresponding positions in the drawing area by dragging, and adjusting the sizes of the components according to actual conditions to form points and surfaces in a topological structure; S102, using the line drawing tool to draw the connection relationship between components to form lines in a topological structure; S103, further adjusting the connection relationship, position and direction of the points, lines and surfaces to complete the construction of the graphical model of the steam power system based on the point-line-surface topological structure.

[0039] Furthermore, the properties of the points, lines and surfaces can be edited by using a property editing tool to facilitate modification of the properties of the points, lines and surfaces.

[0040] The graphical mechanism modeling method of the steam power system based on the point-line-surface topological structure of this embodiment can intuitively construct a model of the steam power system through a graphical interface, clearly display the structure and operation principle of the steam power system, and is highly intuitive.

[0041] The graphical modeling method uses point, line and surface structure to draw the complex steam power system, so that the model can be easily established. Because it is a graphical group drawing method, when the actual steam power system is expanded, the model can also be expanded accordingly without having to be rebuilt.

[0042] S200, obtaining and determining the model parameters of the constructed graphical model of the steam power system based on the point-line-surface topological structure Specifically, the model parameters include component parameters and operating environment parameters, where: The component parameters are specific parameters of each component, such as pressure, temperature, flow rate of boiler components; speed, power, and inlet and outlet parameters of turbine components; The operating environment parameters include but are not limited to ambient temperature and atmospheric pressure.

[0043] In another embodiment, the model parameters may also include pipeline parameters.

[0044] In this embodiment, the component parameters and the operating environment parameters can be edited and saved by a property editing tool, thereby determining the model parameters of the graphical model of the steam power system based on the point-line-surface topological structure.

[0045] The model parameters can be determined according to the actual operation of the steam power system.

[0046] The graphical mechanism modeling method of the steam power system based on the point-line-surface topological structure of this embodiment is highly flexible and scalable. Users can freely adjust the parameters and structure of the model according to their needs. It has good scalability and can adapt to the modeling needs of steam power systems of different scales and complexities.

[0047] S300: Generate a mechanism model based on the constructed graphical model of the steam power system based on the point-line-surface topological structure and the determined model parameters. In this embodiment, the generated mechanism model is represented by equations, including mass conservation equation, energy conservation equation, pipeline pressure drop equation, pipeline heat dissipation equation, turbine work equation, boiler counter-balance efficiency equation, and calculation equations such as temperature layer heat transfer coefficient calculation and heat exchanger heat transfer coefficient calculation.

[0048] By constructing the graphical model of the steam power system based on the point-line-surface topological structure and determining the model parameters, the corresponding mechanism model equations are automatically generated.

[0049] The graphical mechanism modeling method of the steam power system based on the point-line-surface topological structure of this embodiment has high modeling efficiency, can quickly build a graphical model, and generate mechanism model equations, thereby greatly improving the modeling efficiency.

[0050] S400: Verify the mechanism model based on measured data and calculated data obtained by using the generated mechanism model Specifically, in a specific example, the measured parameter data of the steam power system operation is obtained, and the flow, pressure and temperature parameter data of the equipment operation are input into the mechanism model to calculate the parameters including power, heat load and thermal efficiency, and the calculated data of each parameter is obtained, and the calculated data of each parameter is compared with the measured data to determine whether to calibrate the mechanism model. Preferably, the measured parameter data of the steam power system operation can be directly read through the instrument monitoring platform of the steam power system.

[0051] Preferably, it is determined whether to calibrate the mechanism model according to the relative error value between the calculated data and the measured data, and a relative error threshold value, such as ±5% or ±3%, is set. When ±5% is adopted, if the relative error between the calculated data and the measured data of the parameter is not greater than ±5%, it means that the generated mechanism model is appropriate and no correction is required; when the relative error between the calculated data and the measured data of the parameter is greater than ±5%, it is first determined whether the measured data of the parameter is accurate. If the measured data is accurate, the mechanism model is corrected until the relative error between the calculated data and the measured data of the parameter obtained according to the mechanism model is not greater than ±5%, and the correction of the mechanism model is stopped.

[0052] In other embodiments, other comparison methods may also be used to determine whether to calibrate the mechanism model.

[0053] When calibrating the mechanism model, adjustments can be made through adjustment factors, such as adjusting the mechanism model through pressure drop factor, insulation layer efficiency reduction factor and insulation layer exposure factor, so that the calculated data of the parameters are consistent with the measured data, thereby ensuring the accuracy and reliability of the mechanism model.

[0054] The mechanism model of this embodiment integrates the operating laws of the steam power system at the physical level. Through the mechanism model, not only the data (structural data, instrument data) is verified, but also the model itself is verified.

[0055] In this embodiment, the structural data that is prone to error and has a greater impact on the accuracy of the model is the pipe diameter and the insulation condition. By comparing the measured instrument pressure data with the calculated pressure data obtained using the mechanism model, the accuracy of the pipe diameter can be determined; by comparing the measured instrument temperature data with the calculated temperature data obtained using the mechanism model, and combining the external surface temperature measurement, the accuracy of the measuring instrument can be judged, and the accuracy of the insulation can be determined so as to correct the insulation condition.

[0056] Furthermore, the graphical mechanism modeling method of the steam power system based on the point-line-surface topological structure also includes: S500: Perform performance analysis on the verified mechanism model and optimize according to the performance analysis results. Specifically, in this embodiment, a plurality of performance indicators are first predetermined, and then the generated mechanism model is subjected to performance analysis using a performance analysis algorithm to obtain analysis results of the plurality of performance indicators. For example, in one embodiment, the performance analysis indicators may be cost, standard coal consumption for power supply, and carbon dioxide emissions.

[0057] Furthermore, optimization objectives and specific constraints are set, the mechanism model is optimized using an optimization algorithm, and the parameters and structure of the steam power system are adjusted to achieve the optimal operating conditions. Specifically, the optimization objectives may be cost minimization and carbon emission minimization, and the constraints may be the start and stop status of the equipment, the maximum and minimum constraints of the flow, pressure and temperature, and the constraints on the amount of electricity purchased. Among them, the parameter adjustment of the steam power system may be the adjustment of pressure, flow or temperature, and the structural adjustment of the steam power system may be the change of pipe diameter, the change of the connection sequence of pipelines and equipment, the addition of new equipment, etc.

[0058] If multiple operating conditions are obtained under the set optimization goals and specific constraints, the performance indicators under different conditions can be compared, and a more optimized operating condition can be determined based on the analysis results of the performance indicators. For example, when there is only a slight difference in other performance indicators, the operating condition with lower cost can be used as the optimal operating condition.

[0059] The performance analysis algorithm and optimization algorithm used in this embodiment are existing algorithms in the prior art. This embodiment does not improve the algorithm itself, so the specific algorithm will not be described in detail.

[0060] Furthermore, the performance analysis results and optimization solutions of the mechanism model are intuitively displayed on a display screen, so that users can easily understand the analysis results and optimization solutions, and can also be output in the form of generated report documents.

[0061] The graphical mechanism modeling method of the steam power system based on the point-line-surface topological structure of this embodiment displays the performance analysis results and optimization solutions in an intuitive manner, which is convenient for users to understand and analyze.

[0062] Embodiment 2 As a specific embodiment of the present invention, the present invention provides a graphical mechanism modeling system for a steam power system based on a point-line-surface topological structure, referring to Figure 4 , including a graphical model building module 1, a model parameter determination module 2, a mechanism model generation module 3, and a mechanism model verification module 4, wherein: The graphical model building module 1 is used to build a graphical model of a steam power system based on a point-line-surface topological structure; The model parameter determination module 2 is used to obtain and determine the model parameters of the constructed steam power system graphical model based on the point-line-surface topological structure; The mechanism model generation module 3 is used to generate a mechanism model according to the constructed graphical model of the steam power system based on the point-line-surface topological structure and the determined model parameters; The mechanism model verification module 4 is used to verify the mechanism model based on measured data and calculated data obtained by using the generated mechanism model.

[0063] Furthermore, the graphical mechanism modeling system of the steam power system based on the point-line-surface topological structure also includes a performance analysis and optimization module 5 and a result output module 6, wherein: The performance analysis and optimization module 5 is used to perform performance analysis on the verified mechanism model and optimize according to the performance analysis results; The result output module 6 is used to output and display the performance analysis results and optimization solutions, and generate report documents. The result output module 6 displays the performance analysis results and optimization solutions in an intuitive way. Users can view and analyze the results in the result display area. Users can select the report generation function to output the model calculation results in the form of documents for easy reference.

[0064] The graphical mechanism modeling method and system of the steam power system based on the point-line-surface topological structure of the present invention can be widely used in industries such as oil refining, petrochemicals, chemicals, coal chemical industry, steel, thermal power, etc., and provide scientific methods and decision-making basis for the planning, design, transformation, operation, management, scheduling, evaluation, optimization, energy conservation and training of steam power systems, so as to achieve the goals of optimized design, safe operation, energy conservation and carbon reduction.

[0065] Embodiment 3 As a specific embodiment of the present invention, this embodiment provides an example to further illustrate the graphical mechanism modeling method and system of the steam power system based on the point-line-surface topological structure of the present invention, so as to better reflect the advantages and performance of the present invention.

[0066] Reference Figure 5 , is a graphical model of the steam power system of an industrial enterprise based on a point-line-surface topological structure constructed in this example. As above, in order to better understand the graphical model of the steam power system, Figure 5 Some components of the graphical model of the steam power system are identified in .

[0067] In the steam power system model of the industrial enterprise in this embodiment, three boilers with a rated evaporation capacity of 220t / h are configured. The steam pipeline network of the whole plant is respectively equipped with 9.0MPa (high pressure), 3.5MPa (medium pressure), 1.1MPa, 1.0MPa (low pressure) and 0.4MPa (low-low pressure) steam pipeline networks, and each level of steam pipeline network is equipped with a temperature reducer. Under the current working conditions, the power station operates two boilers with a total evaporation capacity of 332.76t / h; one steam turbine is in operation with a power of 15518kW and a condensing capacity of 44t / h.

[0068] Among them, in the steam power system model, the internal low-pressure steam pressure of synthetic ammonia is 1.05MPa, the low-pressure pipeline pressure is 0.65MPa, and there is a pressure difference of 0.4MPa.

[0069] In the existing scheme, a regulating valve is installed in the low-pressure steam pipeline for synthetic ammonia external supply, and the user controls (increases) the internal pressure of synthetic ammonia to avoid the two back-pressure steam turbines (ammonia compressor turbines) from tripping due to too low back-pressure. Figure 5 In the middle A area. In order to ensure the internal pressure, the low-pressure steam supplied to the synthetic ammonia is controlled at least above 100t / h. As a result, 32.5t / h of medium-pressure steam is discharged into the low-pressure system through temperature and pressure reduction inside the synthetic ammonia, resulting in a waste of steam work capacity. In addition, the exhaust temperature of one of the ammonia compressor turbines (TK602) is too high (319.3℃), and the internal efficiency is only 51.2%, which increases the consumption of medium-pressure steam.

[0070] The optimization scheme generated by the present invention is: to transform the flow of two back-pressure steam turbines (ammonia compressor turbines), reduce the exhaust pressure and match the pipeline network, and improve the internal efficiency of the ammonia compressor turbine (TK602) to 75%; at the same time, steam is taken from the medium-pressure steam pipeline network again to meet the higher pressure requirements of the air compressor turbine's extractor, and the steam consumption is about 1t / h.

[0071] After optimization, the total steam intake and exhaust volume of the two back-pressure units decreased by 21.3t / h. After overall model calculation, the evaporation of the power station boiler was reduced by 1.57t / h, the generator increased power generation by 406.1kW, and the operating cost was reduced by 551.21 yuan / h. According to the annual operation of 8,400 hours, the annual economic benefit is 4.6302 million yuan.

[0072] In addition, in the steam power system model, the circulating water plant has two 1000kW steam condensing turbines to drive the circulating water pump. Currently, 0.5MPa steam produced by chemical industry is used, and the steam capacity is about 10t / h. Figure 5 Middle B area. When the steam output is large, the steam turbine is turned on; when the steam output is small, the coaxial motor is turned on to drive together. Through simulation calculations, it can be seen that the energy utilization efficiency of the steam condensation driven turbine is only 13%, and hundreds of tons of circulating water are required for cooling.

[0073] The optimization scheme generated by the present invention is: after the pressure matching transformation of the synthetic ammonia, the working capacity of the medium-pressure steam can be released, and the original condensing turbine of the circulating water plant can be replaced with a back-pressure turbine, with medium-pressure steam inlet and low-pressure exhaust. Under the same power (1000kW), the demand for medium-pressure steam is 12.7t / h. The replaced low-pressure steam is sent to the power station through an additional pipeline to heat the deoxygenated water. According to the amount of medium-pressure steam, two 1000kW back-pressure turbines can be added to replace the current two condensing turbines, and they can operate for a long period of time without being affected by the fluctuation of low-pressure steam production.

[0074] After optimization, the first turbine was rebuilt, the evaporation of the power station boiler was reduced by 9.49t / h, the power generation of the generator was reduced by 825.5kW, and the operating cost was reduced by 1279.64 yuan / h. According to the annual operation of 8400 hours, the annual economic benefit was 10.749 million yuan; the second turbine was rebuilt, the evaporation of the power station boiler increased by 1.46t / h, the power generation of the generator increased by 97.2kW, the power consumption of the whole plant was reduced by 1008kW, and the operating cost was reduced by 426.57 yuan / h. According to the annual operation of 8400 hours, the annual economic benefit was 3.5832 million yuan.

[0075] The above description is only a preferred embodiment of the present invention and does not constitute any other form of limitation to the present invention. Any modification or equivalent change made based on the technical essence of the present invention still falls within the scope of protection required by the present invention.

Claims

1. A graphical mechanism modeling method for a steam power system based on a point-line-surface topological structure, characterized in that: The method comprises: Using a pre-established component library and a graphics drawing tool, a graphical model of a steam power system based on a point-line-surface topological structure is constructed, wherein the point-line-surface topological structure includes point components, equipment components, and pipelines connecting the point components and equipment components of the steam power system; Acquire and determine model parameters of the constructed graphical model of the steam power system based on the point-line-surface topological structure, wherein the model parameters include component parameters and operating environment parameters; Generate a mechanism model according to the constructed graphical model of the steam power system based on the point-line-surface topological structure and the determined model parameters; Based on the measured data and the calculated data obtained by using the generated mechanism model, the mechanism model is verified, wherein when the difference between the measured data and the calculated data is greater than a set threshold, the mechanism model is corrected until the difference between the measured data and the calculated data is no greater than the set threshold; The verified mechanism model is subjected to performance analysis and optimized according to the performance analysis results.

2. The graphical mechanism modeling method of a steam power system based on a point-line-surface topological structure according to claim 1 is characterized in that: The method of using a pre-established component library and a graphics drawing tool to construct a graphical model of a steam power system based on a point-line-surface topological structure includes: Select the components required for the points and surfaces in the component library, place the components to the corresponding positions in the graphical interface by dragging, and adjust the sizes of the components according to actual conditions to form the points and surfaces in the topological structure; Using the graphic drawing tool to draw the connection relationship between components to form lines in the topological structure; The connection relationship, position and direction of the points, lines and surfaces are adjusted to complete the construction of the graphical model of the steam power system based on the point-line-surface topological structure.

3. The graphical mechanism modeling method of a steam power system based on a point-line-surface topological structure according to claim 2 is characterized in that: The graphic drawing tools include point drawing tools, line drawing tools and surface drawing tools, which are respectively used for drawing point components, pipelines and equipment components in the topological structure.

4. The graphical mechanism modeling method of a steam power system based on a point-line-surface topological structure according to claim 1 is characterized in that: The mechanism model includes mass conservation equation, energy conservation equation, pipeline pressure drop equation, pipeline heat dissipation equation, turbine work equation, boiler counter-balance efficiency equation, and thermal layer heat transfer coefficient calculation equation and heat exchanger heat transfer coefficient calculation equation.

5. The graphical mechanism modeling method of a steam power system based on a point-line-surface topological structure according to claim 1 is characterized in that: The verification of the mechanism model based on the measured data and the calculated data obtained by using the generated mechanism model includes determining whether to correct the mechanism model according to the relative error between the measured data and the calculated data. When the relative error between the measured data and the calculated data is greater than ±5%, the mechanism model is corrected until the relative error between the measured data and the calculated data is no greater than ±5%.

6. The graphical mechanism modeling method of a steam power system based on a point-line-surface topological structure according to claim 5 is characterized in that: When the relative error between the measured data and the calculated data is greater than a set threshold, it is first determined whether the measured data is accurate. If it is determined that the measured data is accurate, the mechanism model is corrected.

7. The graphical mechanism modeling method of a steam power system based on a point-line-surface topological structure according to claim 6 is characterized in that: The verification of the mechanism model based on the measured data and the calculated data obtained by using the generated mechanism model includes correcting the mechanism model using a pressure drop factor, an insulation layer efficiency reduction factor, and an insulation layer exposure factor.

8. The graphical mechanism modeling method of a steam power system based on a point-line-surface topological structure according to claim 1 is characterized in that: The performance analysis of the verified mechanism model and optimization according to the performance analysis results include predetermining a plurality of performance indicators, performing performance analysis on the mechanism model using a performance analysis algorithm, and obtaining analysis results of the plurality of performance indicators.

9. The graphical mechanism modeling method of a steam power system based on a point-line-surface topological structure according to claim 8 is characterized in that: The performance analysis of the verified mechanism model and the optimization according to the performance analysis result include setting optimization goals and constraints, and optimizing the mechanism model using an optimization algorithm.

10. A graphical mechanism modeling system for a steam power system based on a point-line-surface topological structure, characterized in that: The system comprises a graphical model building module (1), a model parameter determination module (2), a mechanism model generation module (3), a mechanism model verification module (4) and a performance analysis and optimization module (5), wherein: The graphical model building module (1) is used to build a graphical model of a steam power system based on a point-line-surface topological structure; The model parameter determination module (2) is used to obtain and determine the model parameters of the constructed steam power system graphical model based on the point-line-surface topological structure; The mechanism model generation module (3) is used to generate a mechanism model according to the constructed graphical model of the steam power system based on the point-line-surface topological structure and the determined model parameters; The mechanism model verification module (4) is used to verify the mechanism model based on measured data and calculated data obtained using the generated mechanism model; The performance analysis and optimization module (5) is used to perform performance analysis on the verified mechanism model and to perform optimization according to the performance analysis results.

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