A digital twin system for a coal pulverizing unit of a thermal power generating unit

Abstract

The present application aims at providing a pulverizing digital twin system of a thermal power unit, comprising a physical pulverizing subsystem, a virtual pulverizing subsystem, a twin data subsystem, a pulverizing application service subsystem and a dynamic real-time interaction subsystem. The system is used for studying the whole life cycle process of raw coal from a coal feeder to a coal mill and finally being made into pulverized coal and blown into a furnace for combustion. In the process, effective data of the whole life cycle process are extracted, geometric models, physical models and behavior models are created, the pulverizing digital twin system is built, the whole cycle is tracked and monitored, the whole pulverizing process is dynamically and interactively optimized aiming at adjustment deviation and application service system demand, the main steam pressure control is advanced to the raw coal transportation stage, and the optimized parameters are transmitted to each system and application layer, based on the pulverizing digital twin system, coal belt fault and coal mill blockage problem are found in time, and the problem of combustion system adjustment lag is fundamentally solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of thermal power generators, in particular to a digital twin system for pulverizing of thermal power generators. BACKGROUND

[0002] The large inertia and large delay characteristics of the pulverizing system of the thermal power generator unit, and the change of coal quality have a significant impact on the combustion performance, and further affect the stability of the main steam pressure, and the stability of the main steam pressure has an important influence on the economy and safety of the unit operation. In order to solve the above problems, a digital twin system for pulverizing of thermal power generators fuses a physical pulverizing subsystem, a virtual pulverizing subsystem, a twin data subsystem, a pulverizing application service subsystem, and a dynamic real-time interaction subsystem to form a digital twin system for pulverizing, extracts effective data in the whole life cycle process, geometric models, physical models, and behavior models, builds a digital twin system for pulverizing, performs full-cycle tracking and monitoring, dynamically interacts to optimize the whole pulverizing process according to the adjustment deviation and application service system requirements, and controls the main steam pressure in advance to the raw coal transportation stage. The optimized parameters are transmitted to each system and application layer, and the coal belt fault (deviation, coal blockage) and the mill blockage problem are found in time based on the digital twin system for pulverizing, so as to fundamentally solve the problem of combustion system regulation lag. SUMMARY

[0003] The present application aims to solve the problems of easy blockage and poor regulation performance of the existing pulverizing system of thermal power generators, and proposes a digital twin system for pulverizing of thermal power generators.

[0004] A digital twin system for pulverizing of thermal power generators, comprising a physical pulverizing subsystem, a virtual pulverizing subsystem, a twin data subsystem, a pulverizing application service subsystem, and a dynamic real-time interaction subsystem.

[0005] Further, a digital twin system for pulverizing of thermal power generators, wherein the physical devices of the physical pulverizing system include a coal feeder, a coal mill, a wind-powder pipeline, and a furnace.

[0006] Further, a digital twin system for pulverizing of thermal power generators, wherein the physical pulverizing system comprises a raw coal primary screening module, a coal milling module, and a coal powder combustion module.

[0007] The raw coal primary screening module is used for the raw coal in the coal yard which is not processed and is sent to the raw coal bunker by the coal belt after primary screening.

[0008] The coal milling module is used for the raw coal falling into the coal feeder from the raw coal bunker, and the coal feeder sends the raw coal into the coal mill to be ground into qualified coal powder.

[0009] The coal powder combustion module is used for the coal powder to be blown by the primary air, enter the furnace after the wind-powder pipeline and the combustor, and be combusted.

[0010] Further, a digital twin system for pulverizing in a thermal power generating unit, the virtual pulverizing subsystem is built according to a virtual building module of the physical pulverizing subsystem, including a geometric model, a physical model, and a behavior model; the function of the virtual pulverizing subsystem is to map the physical pulverizing subsystem, and to map the physical devices, systems, processes, and parameter data to the virtual pulverizing system.

[0011] Further, a digital twin system for pulverizing in a thermal power generating unit, the geometric model includes a coal belt, a coal feeder, a coal mill, a hot air door, a pipeline, cold primary air, hot primary air, and a combustion model.

[0012] Further, a digital twin system for pulverizing in a thermal power generating unit, the physical model includes a rotation speed of the coal feeder, a pulverizing time of the coal mill, a cold primary air volume, a hot primary air volume, a primary air pressure, a movement trajectory and time of raw coal and coal powder, and a dynamic image of a furnace flame.

[0013] Further, a digital twin system for pulverizing in a thermal power generating unit, the behavior model includes a rotation and transportation sub-module of the coal feeder, a pulverizing movement sub-module of the coal mill, a pipeline wind force and coal powder movement sub-module, and a coal powder furnace combustion sub-module.

[0014] The rotation and transportation sub-module of the coal feeder: real-time collection of the rotation speed of the coal feeder, accumulation of the time of raw coal from entering the identification area of the coal feeder to leaving the identification area of the coal feeder, and judgment of whether the belt transportation is normal through the rotation speed of the coal feeder, the coal feeding amount, and the current of the coal feeder.

[0015] The pulverizing movement sub-module of the coal mill: accumulation of the time of raw coal from entering the identification area of the coal mill to leaving the identification area of the coal mill after being pulverized into coal powder, and judgment of whether the coal mill is blocked according to the vibration frequency of the coal mill and the coal feeding rate.

[0016] The pipeline wind force and coal powder movement sub-module: construction of a coal powder movement trajectory, calculation of a coal powder carrying force, accumulation of the time of coal powder from entering the air and coal powder pipeline to reaching the furnace, and optimization of the wind force, wind speed, and wind temperature according to virtual data.

[0017] The coal powder furnace combustion sub-module: tracking of the combustion condition of the furnace according to the dynamic image of the furnace flame, and judgment of whether it belongs to an oxygen-enriched combustion condition through the total air volume and the oxygen volume.

[0018] Further, a digital twin system for pulverizing in a thermal power generating unit, the twin data subsystem includes physical twin data, virtual twin data, and virtual application data.

[0019] The physical twin data module receives sensing data of the physical pulverizing system and sends the data to drive the physical pulverizing system.

[0020] The virtual twin data module receives sensing data of the virtual pulverizing system and sends the data to drive the virtual pulverizing system.

[0021] The virtual application data module receives sensing data of the pulverizing application service system and sends data driving to the pulverizing application service system.

[0022] Further, a digital twin system for a pulverizing system of a thermal power unit, the pulverizing application service subsystem comprises coal powder movement trajectory monitoring, visual online diagnosis, and three-dimensional operation guidance.

[0023] The coal powder movement trajectory monitoring: real-time dynamic monitoring of the coal powder movement trajectory, including movement time, speed, position, and coal supply amount, estimation of the raw coal and coal powder movement trajectory, monitoring of whether the air volume is sufficient and whether the combustion is sufficient, and judgment of whether coal interruption and mill blockage abnormal conditions occur.

[0024] The visual online diagnosis: when abnormal conditions occur, the visual online diagnosis of the abnormal condition performance and causes is performed, and the diagnosis result is reported to the system, and a solution is provided through the three-dimensional operation guidance.

[0025] The three-dimensional operation guidance: in the three-dimensional guidance system, the operation guidance is fed back to the system, and the system is adjusted through alarm, automatic intervention, and manual intervention.

[0026] Further, a digital twin system for a pulverizing system of a thermal power unit, the dynamic real-time interaction module transmits information through a bus to realize information interaction and feedback between the physical pulverizing system and the virtual pulverizing system, the virtual pulverizing system and the pulverizing application service system, the physical pulverizing system and the pulverizing application service system, the physical pulverizing subsystem and the twin data subsystem, the virtual pulverizing subsystem and the twin data subsystem, and the pulverizing application service subsystem and the twin data subsystem.

[0027] The present application has the following advantages: through the digital twin system for a pulverizing system of a thermal power unit, a geometric model, a physical model, and a behavior model of a virtual pulverizing subsystem are constructed according to a physical pulverizing system, physical devices, systems, process flows, and process parameters are mapped to the virtual pulverizing system, actual physical pulverizing system failures are found in time, wind power, wind speed, and wind temperature are optimized according to virtual data, full-cycle tracking monitoring and optimization of the pulverizing process are realized, and the problems of traditional thermal power unit combustion system regulation lag are fundamentally solved. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 The figure is a system composition diagram.

[0029] Figure 2 The figure is a flowchart of the physical pulverizing system.

[0030] In the figure: 1-coal feeder, 2-mill, 3-pulverized coal pipeline, and 4-furnace. EMBODIMENT

[0031] In order to have a clearer understanding of the technical features, objectives and effects of the present application, the specific embodiments of the present application will now be described with reference to the accompanying drawings.

[0032] As shown in the accompanying drawings Figure 1 A digital twin system for pulverizing of a thermal power unit includes a physical pulverizing subsystem, a virtual pulverizing subsystem, a twin data subsystem, a pulverizing application service subsystem, and a dynamic real-time interaction subsystem.

[0033] 1. The physical pulverizing system is the sum of physical equipment, process and flow, and process parameters of the pulverizing system of the thermal power unit. The physical pulverizing system provides the basis for modeling of the geometric model, physical model, and behavior model of the virtual pulverizing system. The pulverizing system refers to the process of transporting raw coal to the coal mill 2 for grinding into qualified coal powder by the coal feeder 1, and then blowing the coal powder into the furnace 4 for combustion through the air-pulverized coal pipeline 3. The equipment involved includes the coal feeder 1, the coal mill 2, the air-pulverized coal pipeline 3, and the furnace 4.

[0034] The process steps of the physical pulverizing system are as follows:

[0035] S1: The raw coal in the coal yard that has not been processed is subjected to preliminary screening and is sent to the raw coal bunker by the coal conveying belt.

[0036] S2: The screened raw coal falls into the coal feeder from the raw coal bunker and is sent into the coal mill by the coal feeder to be ground into qualified coal powder.

[0037] S3: The coal powder is blown by the primary air through the air-pulverized coal pipeline and the burner and then enters the furnace for combustion.

[0038] 2. The virtual pulverizing subsystem is virtually modeled based on the physical pulverizing subsystem and includes a geometric model, a physical model, and a behavior model. The physical model is mapped to the virtual model, and the physical equipment, system, process flow, and process parameters are mapped to the virtual pulverizing system.

[0039] 2.1 Geometric model: The mechanical structure geometric model of the physical pulverizing system is constructed, including the coal conveying belt, the coal feeder 1, the coal mill 2, the hot air door, the pipeline, the cold primary air, the hot primary air, the furnace, etc.

[0040] 2.2 Physical model: The physical pulverizing system is virtually mapped based on the collected real-time data and historical data, including the rotational speed of the coal feeder 1, the pulverizing time of the coal mill 2, the cold primary air volume, the hot primary air volume, the primary air pressure, the movement trajectory and time of the raw coal and coal powder, the dynamic image of the furnace flame, etc.

[0041] 2.3 Behavior model: Specifically includes:

[0042] 2.3.1 Coal feeder 1 rotation transport sub-module: real-time acquisition of coal feeder 1 rotation speed, and realization of cumulative time of raw coal from entering the identification area of coal feeder 1 to leaving the identification area of coal feeder 1, judgment of whether the belt transport is normal through the coal feeder rotation speed, coal feeding amount, coal feeder current;

[0043] 2.3.2 Coal mill 2 pulverizing movement sub-module; cumulative time of raw coal from entering the identification area of coal mill 2 to being pulverized into coal powder and then the coal powder leaving the identification area of coal mill 2, and judgment of whether the mill is blocked according to the vibration frequency of coal mill 2, coal feeding amount, mill current and other signals;

[0044] 2.3.3 Pneumatic coal carrying movement sub-module: establishment of a pneumatic coal carrying movement model, construction of a coal carrying movement trajectory, calculation of a coal carrying force, cumulative time of coal powder from entering the pneumatic coal pipeline to reaching the furnace 4, and optimization of wind force, wind speed and wind temperature according to virtual data;

[0045] 2.3.4 Pulverized coal furnace 4 combustion sub-module: tracking of the combustion condition of furnace 4 according to the relevant data of the dynamic image of the flame of furnace 4, and judgment of whether it belongs to an oxygen-enriched combustion condition through the total air volume and oxygen content.

[0046] 3. Twin data, extraction of useful data information of the physical pulverizing system and the virtual pulverizing system, giving of optimized data or guidance data through a given optimization algorithm and experience algorithm, bidirectional communication, and optimization and adjustment of the physical pulverizing system and the virtual pulverizing system.

[0047] Specifically, it includes:

[0048] 3.1 receiving the sensing data of the physical pulverizing system and sending the data to drive the physical pulverizing system.

[0049] 3.2 receiving the sensing data of the virtual pulverizing system and sending the data to drive the virtual pulverizing system.

[0050] 3.3 receiving the sensing data of the pulverizing application service system and sending the data to drive the pulverizing application service system.

[0051] 3.4 receiving the sensing data of the physical pulverizing subsystem and sending the data to drive the twin data subsystem,

[0052] 3.5 receiving the sensing data of the virtual pulverizing subsystem and sending the data to drive the twin data subsystem,

[0053] 3.6 receiving the sensing data of the pulverizing application service subsystem and sending the data to drive the twin data subsystem

[0054] 4. A pulverizing application service system, an open and friendly man-machine interface, a coal powder movement trajectory graph is established through the movement time, speed, real-time position, coal supply amount, mill current, coal feeder current, etc. of raw coal and coal powder, the coal powder movement process is accurately tracked based on a physical pulverizing subsystem and a virtual pulverizing subsystem, and coal powder movement trajectory monitoring, visual online diagnosis and three-dimensional operation guidance are realized.

[0055] 4.1 Coal powder movement trajectory monitoring: real-time dynamic monitoring of coal movement trajectory, including movement time, speed, position, coal supply amount, etc., estimation of raw coal and coal powder movement trajectory, and provision of strong data for comprehensive judgment of whether abnormal conditions such as coal breakage and mill blockage occur.

[0056] 4.2 Visual online diagnosis: when abnormal conditions occur, visual online diagnosis of abnormal condition performance and causes is performed, and the system is reported, and a solution is provided through three-dimensional operation guidance.

[0057] 4.3 Three-dimensional operation guidance: in the three-dimensional guidance system, when abnormal conditions occur, operation guidance is fed back to the system, and timely adjustment is performed through alarm, automatic intervention, manual intervention and the like.

[0058] 5. Dynamic real-time interaction: through bus information transmission technology, information interaction and feedback between a physical pulverizing system and a virtual pulverizing system, the virtual pulverizing system and a pulverizing application service system, the physical pulverizing system and the pulverizing application service system, a physical pulverizing subsystem and a twin data subsystem, a virtual pulverizing subsystem and the twin data subsystem, and a pulverizing application service subsystem and the twin data subsystem are realized.

[0059] The scheme realizes the full-cycle tracking monitoring and optimization of the pulverizing process through a thermal power unit pulverizing digital twin system, which maps physical devices, systems, process flows and process parameters to a virtual pulverizing system according to the geometric model, physical model and behavior model of the twin system constructed based on the physical pulverizing system, timely discovers actual physical pulverizing system faults, optimizes the wind, wind speed and wind temperature according to virtual data, and fundamentally solves the problem of traditional thermal power unit combustion system regulation lag.

[0060] The basic principles and main features of the present application and the advantages of the present application are shown and described above. It should be understood by those skilled in the art that the present application is not limited by the above examples, and the above examples and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A pulverizing digital twin system for a thermal power unit, characterized in that, The system comprises a physical pulverizing subsystem, a virtual pulverizing subsystem, a twin data subsystem, a pulverizing application service subsystem, and a dynamic real-time interaction subsystem; the physical devices of the physical pulverizing subsystem include a coal feeder (1), a coal mill (2), a wind-powder pipeline (3), and a furnace (4); The virtual pulverizing subsystem is built according to a virtual model of the physical pulverizing subsystem, and comprises a geometric model, a physical model, and a behavior model; the function of the virtual pulverizing subsystem is to map the physical pulverizing subsystem, and to map the physical devices, systems, processes, and parameter data to the virtual pulverizing system; The behavior model comprises a coal feeder (1) rotation and transportation submodule, a coal mill (2) pulverizing motion submodule, a pipeline wind-powder motion submodule, and a coal-powder furnace (4) combustion submodule; The coal feeder (1) rotation and transportation submodule collects the rotation speed of the coal feeder (1) in real time, accumulates the time of raw coal from entering the identification area of the coal feeder (1) to leaving the identification area of the coal feeder (1), and judges whether the coal feeder transportation is normal through the rotation speed, coal feeding amount, and current of the coal feeder; The coal mill (2) pulverizing motion submodule accumulates the time of raw coal from entering the identification area of the coal mill (2) to leaving the identification area of the coal mill (2) after being pulverized into coal powder, and judges whether the coal mill is blocked according to the vibration frequency, coal feeding amount, and current of the coal mill; The pipeline wind-powder motion submodule constructs a powder-carrying motion trajectory, calculates the powder-carrying force, accumulates the time of coal powder from entering the wind-powder pipeline to reaching the furnace (4), and optimizes the wind force, wind speed, and wind temperature according to virtual data; The coal-powder furnace (4) combustion submodule traces the combustion condition of the furnace (4) according to the dynamic image of the flame of the furnace (4), and judges whether the combustion condition belongs to an oxygen-enriched combustion condition through the total air volume and oxygen volume.

2. The digital twin system for coal pulverizing of a thermal power unit according to claim 1, wherein, The physical pulverizing subsystem comprises a raw coal preliminary screening module, a coal pulverizing module, and a coal-powder combustion module; the raw coal preliminary screening module is used for preliminarily screening and processing the raw coal in a coal yard, and sending the raw coal to a raw coal bin by a coal conveying belt; The coal pulverizing module is used for sending the raw coal from the raw coal bin to the coal feeder (1), and then to the coal mill (2) to be pulverized into qualified coal powder by the coal feeder (1); The coal-powder combustion module is used for sending the coal powder to the furnace (4) after being blown by primary air through the wind-powder pipeline (3) and a burner.

3. The digital twin system for coal pulverizing of a thermal power unit as claimed in claim 1 wherein, The geometric model comprises a coal conveying belt, the coal feeder (1), the coal mill (2), a hot air door, a pipeline, cold primary air, hot primary air, and a furnace.

4. The coal pulverizing digital twin system of claim 1, wherein, The physical model comprises the rotation speed of the coal feeder (1), the pulverizing time of the coal mill (2), the cold primary air volume, the hot primary air volume, the primary air pressure, the motion trajectory and time of the raw coal and the coal powder, and the dynamic image of the flame of the furnace.

5. The digital twin system for coal pulverization of a thermal power unit as claimed in claim 1 wherein, The twin data subsystem comprises physical twin data, virtual twin data, and virtual application data; the physical twin data receives sensing data of the physical pulverizing system, and sends the data to the physical pulverizing system for adjustment and guidance; The virtual twin data receives sensing data of the virtual pulverizing system, and sends the data to the virtual pulverizing system for adjustment and guidance; The virtual application data receives sensing data of the pulverizing application service system, and sends the data to the pulverizing application service system for adjustment and guidance.

6. The coal pulverizing digital twin system of claim 1, wherein, The pulverizing application service subsystem includes coal powder movement track monitoring, visual online diagnosis, and three-dimensional operation guidance. The coal powder movement track monitoring dynamically monitors the coal powder movement track in real time, including movement time, speed, position, and coal supply amount, estimates the raw coal and coal powder movement track, monitors whether the air volume is sufficient and whether the combustion is sufficient, and judges whether abnormal working conditions such as coal interruption and mill blocking occur. The visual online diagnosis visually diagnoses abnormal working condition performance and causes when abnormal working conditions occur, reports to the system, and gives solutions through three-dimensional operation guidance. The three-dimensional operation guidance feeds back to the system through operation guidance when abnormal working conditions occur in the three-dimensional guidance system, and adjusts through alarm, automatic intervention, and manual intervention.

7. The digital twin system for coal pulverization of a thermal power unit as claimed in claim 1 wherein, The dynamic real-time interaction subsystem transmits information through a bus to realize information interaction and feedback between the physical pulverizing subsystem and the virtual pulverizing subsystem, the virtual pulverizing subsystem and the pulverizing application service subsystem, the physical pulverizing subsystem and the pulverizing application service subsystem, the physical pulverizing subsystem and the twin data subsystem, the virtual pulverizing subsystem and the twin data subsystem, and the pulverizing application service subsystem and the twin data subsystem.

Images