CN111475913A - Operation optimization method and system for steam power system - Google Patents
Operation optimization method and system for steam power system Download PDFInfo
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Abstract
The invention relates to a method and a system for optimizing the operation of a steam power system. The method comprises the steps of obtaining performance characteristic parameters, process parameters and topological structures of equipment in the steam power system; constructing a mathematical model of the steam power system according to kirchhoff's law, an energy conservation equation and a mass conservation equation of the steam power system, and performance characteristic parameters, process parameters and a topological structure of the equipment; solving the mathematical model of the steam power system to obtain operation parameters; establishing an objective function by taking the lowest energy consumption and cost as targets, operating parameters as decision variables and performance characteristic parameters, process parameters and topological structures of equipment as constraint conditions; determining an optimal operation parameter according to the objective function; operating operation of the steam power system according to the optimal operating parameters. The invention provides a method and a system for optimizing the operation of a steam power system, which can reduce the waste of energy and reduce the cost.
Description
Technical Field
The invention relates to the field of steam power of industrial enterprises, in particular to a method and a system for optimizing the operation of a steam power system.
Background
Industrial enterprises such as oil refining, petrochemical industry, chemical industry, coal chemical industry, steel and iron, metallurgy, electric power, thermoelectricity and the like are high-energy-consumption enterprises, wherein a steam power system is an important component of the industrial enterprises and has the task of providing required power, electric power, heat energy and other public works for production plants of the industrial enterprises.
Steam power systems are the most important public engineering systems in large industrial enterprises, and are large, complex and high in energy consumption. The consumption of steam and electricity accounts for more than 60% of the energy consumption of enterprises, and the steam cost per year is as high as hundreds of millions to billions of yuan. The operation diagnosis and the energy-saving optimization of the steam power system play a very key role in energy conservation and consumption reduction of chemical enterprises.
The steam power system of the industrial enterprise has a space to be optimized from a pipe network structure to equipment configuration; especially, a pipe network system forms a multi-ring and multi-stage complex situation. The management of the steam system mainly depends on manual experience and limited real-time data, and due to the fact that a measuring instrument is lacked in the steam pipe network or the steam system with low pressure level, blindness in selection of the steam system operation scheme and adjustment of the pipe network is caused, even steam flow direction and flow are not clear, steam temperature and pressure reduction and other degradation use are achieved, emptying phenomena cannot be prevented, precious energy is wasted, and cost is increased.
Disclosure of Invention
The invention aims to provide a method and a system for optimizing the operation of a steam power system, which can reduce the waste of energy and reduce the cost.
In order to achieve the purpose, the invention provides the following scheme:
a method of optimizing operational operation of a steam power system, comprising:
acquiring performance characteristic parameters, process parameters and topological structures of equipment in a steam power system; the equipment comprises a power boiler, a steam turbine, a temperature and pressure reducing device, a deaerator, a steam heater, a condenser, a water feeding pump, a waste heat boiler and a steam pipe network; the performance characteristic parameters comprise evaporation capacity, pressure and temperature of a power boiler, steam inlet capacity, high-pressure steam extraction pressure, high-pressure steam extraction temperature, low-pressure steam extraction capacity, low-pressure steam extraction pressure, low-pressure steam extraction temperature, steam exhaust capacity, steam exhaust vacuum degree and rated power of a steam turbine, outlet flow, outlet pressure, outlet temperature and pressure and temperature of temperature-reducing water of a temperature-reducing pressure reducer, working pressure of a deaerator, the number of tubes, the diameter of the tubes, the length of the tubes and outlet control temperature of a steam heater, the number of the tubes, the diameter of the tubes, the length of the tubes and the flow and inlet temperature of circulating cooling water of a condenser, a lift curve, an efficiency curve and a working frequency of a water supply pump, steam production capacity, steam production pressure and steam production temperature of a waste heat boiler, a flow topological structure of a steam pipe network, and pipe diameter, wall thickness, pipe length, heat preservation and rated power of a pipeline, Elbows and valves; the process parameters comprise annual operation time, system power demand, fuel data, working condition and system tail gas emission;
constructing a mathematical model of the steam power system according to kirchhoff's law, an energy conservation equation and a mass conservation equation of the steam power system, and performance characteristic parameters, process parameters and a topological structure of the equipment;
solving the mathematical model of the steam power system to obtain operation parameters;
establishing an objective function by taking the lowest energy consumption and cost as targets, the operating parameters as decision variables and the performance characteristic parameters, the process parameters and the topological structure of the equipment as constraint conditions;
determining an optimal operation parameter according to the objective function;
operating operation of the steam power system in accordance with the optimal operating parameter.
Optionally, the constructing a mathematical model of the steam power system according to kirchhoff's law, an energy conservation equation and a mass conservation equation of the steam power system, and the performance characteristic parameters, the process parameters and the topological structure of the equipment specifically includes:
determining a hydraulic model of the steam power system according to kirchhoff's law, an energy conservation equation and a mass conservation equation of the steam power system, and performance characteristic parameters, process parameters and a topological structure of the equipment;
determining a heat transfer model of the steam power system according to kirchhoff's law, an energy conservation equation of the steam power system, and performance characteristic parameters, process parameters and a topological structure of the equipment;
and constructing the mathematical model of the steam power system according to the hydraulic model and the heat transfer model.
Optionally, the solving of the mathematical model of the steam power system to obtain the operating parameters specifically includes:
and solving the mathematical model of the steam power system by using a Newton-Raphson algorithm to obtain operation operating parameters.
Optionally, the solving the mathematical model of the steam power system to obtain the operating parameters further includes:
verifying the mathematical model of the steam power system to obtain a verification result;
and optimizing the mathematical model of the steam power system according to the verification result.
A system for optimizing operational operation of a steam powered system, comprising:
the data acquisition module is used for acquiring performance characteristic parameters, process parameters and topological structures of equipment in the steam power system; the equipment comprises a power boiler, a steam turbine, a temperature and pressure reducing device, a deaerator, a steam heater, a condenser, a water feeding pump, a waste heat boiler and a steam pipe network; the performance characteristic parameters comprise evaporation capacity, pressure and temperature of a power boiler, steam inlet capacity, high-pressure steam extraction pressure, high-pressure steam extraction temperature, low-pressure steam extraction capacity, low-pressure steam extraction pressure, low-pressure steam extraction temperature, steam exhaust capacity, steam exhaust vacuum degree and rated power of a steam turbine, outlet flow, outlet pressure, outlet temperature and pressure and temperature of temperature-reducing water of a temperature-reducing pressure reducer, working pressure of a deaerator, the number of tubes, the diameter of the tubes, the length of the tubes and outlet control temperature of a steam heater, the number of the tubes, the diameter of the tubes, the length of the tubes and the flow and inlet temperature of circulating cooling water of a condenser, a lift curve, an efficiency curve and a working frequency of a water supply pump, steam production capacity, steam production pressure and steam production temperature of a waste heat boiler, a flow topological structure of a steam pipe network, and pipe diameter, wall thickness, pipe length, heat preservation and rated power of a pipeline, Elbows and valves; the process parameters comprise annual operation time, system power demand, fuel data, working condition and system tail gas emission;
the operation parameter model building module is used for building a mathematical model of the steam power system according to kirchhoff's law, an energy conservation equation and a mass conservation equation of the steam power system, and performance characteristic parameters, process parameters and a topological structure of the equipment;
the operation parameter determining module is used for solving the mathematical model of the steam power system to obtain operation parameters;
the objective function establishing module is used for establishing an objective function by taking the lowest energy consumption and cost as a target, the operating parameters as decision variables and the performance characteristic parameters, the process parameters and the topological structure of the equipment as constraint conditions;
the optimal operation parameter determining module is used for determining optimal operation parameters according to the objective function;
and the operation module is used for operating the operation of the steam power system according to the optimal operation parameters.
Optionally, the operating parameter model building module specifically includes:
the hydraulic model determining unit is used for determining a hydraulic model of the steam power system according to kirchhoff's law, an energy conservation equation and a mass conservation equation of the steam power system, and performance characteristic parameters, process parameters and a topological structure of the equipment;
the heat transfer model determining unit is used for determining a heat transfer model of the steam power system according to kirchhoff's law, an energy conservation equation of the steam power system, and performance characteristic parameters, process parameters and a topological structure of the equipment;
and the steam power system mathematical model determining unit is used for constructing the steam power system mathematical model according to the hydraulic power model and the heat transfer model.
Optionally, the operating parameter determining module specifically includes:
and the operation parameter determining unit is used for solving the mathematical model of the steam power system by utilizing a Newton-Raphson algorithm to obtain operation parameters.
Optionally, the method further includes:
the verification result determining module is used for verifying the mathematical model of the steam power system to obtain a verification result;
and the optimization module is used for optimizing the mathematical model of the steam power system according to the verification result.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention provides a method and a system for optimizing the operation of a steam power system, which are used for determining operation parameters through a steam power system mathematical model constructed by performance characteristic parameters, process parameters and a topological structure of equipment in the steam power system, establishing an objective function by taking the operation parameters as decision variables and the performance characteristic parameters, the process parameters and the topological structure of the equipment as constraint conditions with the aim of lowest energy consumption and cost, and further operating the operation of the steam power system according to the optimal operation parameters. The blindness in the selection of the steam system operation scheme and the adjustment of the pipe network in the prior art is avoided, and the waste of energy sources and the cost can be reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a schematic flow chart of a method for optimizing the operation of a steam power system according to the present invention;
FIG. 2 is a schematic diagram of an operation optimization system of a steam power system according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a method and a system for optimizing the operation of a steam power system, which can reduce the waste of energy and reduce the cost.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Fig. 1 is a schematic flow chart of an operation optimization method for a steam power system according to the present invention, and as shown in fig. 1, the operation optimization method for a steam power system according to the present invention includes:
s101, acquiring performance characteristic parameters, process parameters and topological structures of equipment in the steam power system. The equipment comprises a power boiler, a steam turbine, a temperature and pressure reducing device, a deaerator, a steam heater, a condenser, a water feeding pump, a waste heat boiler and a steam pipe network; the performance characteristic parameters comprise evaporation capacity, pressure and temperature of a power boiler, steam inlet capacity, high-pressure steam extraction pressure, high-pressure steam extraction temperature, low-pressure steam extraction capacity, low-pressure steam extraction pressure, low-pressure steam extraction temperature, steam exhaust capacity, steam exhaust vacuum degree and rated power of a steam turbine, outlet flow, outlet pressure, outlet temperature and pressure and temperature of temperature reduction water of a temperature reduction pressure reducer, working pressure of a deaerator, the number of tubes, the diameter of the tubes, the length of the tubes and outlet control temperature of a steam heater, the number of the tubes, the diameter of the tubes, the length of the tubes and flow and inlet temperature of circulating cooling water of a condenser, a lift curve, an efficiency curve and working frequency of a water supply pump, steam production capacity, steam production pressure and steam production temperature of a waste heat boiler, a flow topological structure of a steam pipe network, and pipe diameter, wall thickness, pipe length, heat preservation and rated power of a pipeline, Elbows and valves; the process parameters include annual operating time, system power requirements, fuel data, operating conditions, and system exhaust emissions.
S102, constructing a mathematical model of the steam power system according to kirchhoff' S law, an energy conservation equation and a mass conservation equation of the steam power system, and performance characteristic parameters, process parameters and a topological structure of the equipment. The kirchhoff law and the topological structure determine that m outer branch pipes, n inner pipes and j nodes exist in the steam power system. The pressure values of the outer ends of the m outer branch pipes are respectively P1, P2, … … and Pm; solving the following steps: two unknowns per pipe section, pressure drop Δ P and flow G.
(1) According to the principle of conservation of mass: for any node j, have
In the formula: e represents the number of pipe sections directly connected to the node; r represents the flow direction of the fluid in the pipe section, and the flow direction points to the node, so that r is 1; the flow direction indicates the node, then r is 2.
(2) According to the principle of conservation of energy: for any one loop, there are
In the formula: f represents the number of pipe sections constituting the circuit; r represents the flow direction of fluid in the pipe section, and the flow direction is opposite to the direction of the loop, so that r is 1; when the flow direction is the same as the loop direction, r is 2.
For any one channel, there are
In the formula: d represents the number of pipe sections forming the passage; r represents the flow direction of the fluid in the pipe section, and the flow direction is opposite to the direction of the passage, and then r is 1; when the flow direction is the same as the passage direction, r is 2.
And determining a hydraulic model of the steam power system according to kirchhoff's law, an energy conservation equation and a mass conservation equation of the steam power system, and performance characteristic parameters, process parameters and a topological structure of the equipment. According to kirchhoff's law, energy conservation equation and mass conservation equation of steam power system and performance characteristic parameters of equipmentThe method comprises the steps of determining the relationship between the physical characteristics of a pipe network and the operating parameters, such as the relationship between the length and the roughness of a pipe section and the pressure drop and the flow of the pipe section, and determining the process parameters and the topological structure to form a hydraulic model. The steam has a large pressure loss in the pipeline, and the change of the gas density is obvious, so that the compression effect of the gas must be considered. If the pressure drop in the tube is small, the average density can be used to calculate the pressure drop, as shown by Δ p ═ CmG2。
And determining a heat transfer model of the steam power system according to kirchhoff's law, an energy conservation equation of the steam power system, and performance characteristic parameters, process parameters and a topological structure of the equipment. The steam pipeline is usually insulated, but the heat energy can not be completely prevented from being dissipated to the surrounding environment. The system has a heat dissipation simulation function, and the temperature drop of the pipe section, the condition of condensed water and the like are calculated. The heat transfer process of a section of circular steam pipe with a heat-insulating layer comprises five links, namely, steam in the pipe reaches the inner wall surface of the pipe, the inner wall surface of the pipe reaches the outer wall surface of the pipe, the outer wall surface of the pipe reaches the inner wall surface of the heat-insulating layer, the inner wall surface of the heat-insulating layer reaches the outer wall surface of the heat-insulating layer, and the outer wall surface of the heat-insulating layer reaches. The heat loss Q can be calculated as follows: q ═ kA Δ T.
And constructing the mathematical model of the steam power system according to the hydraulic model and the heat transfer model.
After the mathematical model of the steam power system is determined, in order to ensure the accuracy of the mathematical model of the steam power system, the output result of the mathematical model of the steam power system is verified and optimized.
And verifying the mathematical model of the steam power system to obtain a verification result.
And optimizing the mathematical model of the steam power system according to the verification result.
Specifically, after a mathematical model of the steam power system is established, collected flow structure data, the model and instrument measurement data can be verified. The data verification work is not complete mathematical problem, the accuracy and precision of the data are judged from the physical layer, the steam power system model integrates the operation rule of the steam power system on the physical layer, and therefore the data (structural data and instrument data) need to be verified by means of the model, and meanwhile the model is verified. The structure data is easy to make mistakes and has great influence on the accuracy of the model, namely the pipe diameter and the heat preservation condition. Comparing the pressure value obtained through analog calculation with the pressure of an actual measurement instrument to determine the accuracy of the pipe diameter; the temperature value calculated by simulation is compared with the temperature of the actual measurement instrument, the heat preservation condition is corrected by combining the measurement result of the outer surface temperature, and meanwhile, the accuracy of the measurement instrument is judged.
The verification of the steam balance is the most complicated. The steam of each pressure grade has a production balance relation, and the steam of each pressure grade also has a conversion relation, so that the steam system data of each pressure grade can be reasonably verified only if the established model has the function of linkage calculation of each pressure grade. For the problem of unbalanced steam production and steam consumption (usually, the total steam production is always greater than the total steam consumption), (1) finding out which steam consumption points or steam production points are not measured, for example, a large number of heat tracing pipelines of low-pressure grades have no measuring instrument, and a part of small users of high-pressure grades have no measuring instrument, etc.; (2) the steam consumption can be corrected through the process measurement data such as equipment power, heat balance and the like and the equipment operation data; (3) checking data such as temperature and pressure correction of the metering instrument, confirming the accuracy of the instrument data, and giving correction parameters for inaccurate instruments; (4) correcting the flow data by comparing the calculated values of the pipe diameter flow velocity and the temperature pressure with the measured values; (5) finally, the problems of accidental errors, signal errors and the like of the instrument can be verified through mathematical methods such as statistics, denoising and the like. Finally, the obtained measurement data and the simulation calculation data are close to the true values, and the accuracy requirement of the project is met. The flow, pressure and temperature parameters of equipment operation are input in the model, and parameters such as power, heat load, heat efficiency and the like are calculated. And then comparing the actual measurement parameters with the calculation parameters, if the relative error of the actual measurement parameters and the calculation parameters exceeds +/-5%, firstly judging the accuracy of the actual measurement values, then correcting the model, and finally controlling the relative error of the actual measurement parameters and the calculation parameters to +/-5% to finish the confirmation of the equipment model. The flow, partial pressure and temperature of the steam generating equipment and the steam consuming equipment are input as known parameters, and the flow, the pressure, the temperature and other parameters of all steam generating and consuming points can be calculated by utilizing the model. Similarly, comparing the actual measurement parameter with the calculation parameter, if the relative error between the actual measurement parameter and the calculation parameter exceeds +/-5%, firstly judging the accuracy of the actual measurement value, then correcting the model, and finally controlling the relative error between the actual measurement parameter and the calculation parameter to +/-5%, thereby completing the confirmation of the pipe network model.
And S103, solving the mathematical model of the steam power system to obtain operation operating parameters. And solving the mathematical model of the steam power system by using a Newton-Raphson algorithm to obtain operation operating parameters. In order to improve the calculation speed, some skills for accelerating convergence and necessary boundary conditions are adopted, so that the equation solution has stable convergence. For example, for some pipelines with more sections, integration is carried out before a cubic equation, and multiple pipelines are integrated into one pipeline, so that the number of equations is greatly reduced, and the calculation convergence speed is improved; the input conditions are limited, and the possibility of equation set convergence is improved.
And S104, establishing an objective function by taking the lowest energy consumption and cost as targets, the operating parameters as decision variables and the performance characteristic parameters, the process parameters and the topological structure of the equipment as constraint conditions.
And S105, determining the optimal operation parameters according to the objective function.
And S106, operating the steam power system according to the optimal operation parameters.
The operation optimization method of the steam power system provided by the invention effectively reduces the energy consumption and the cost.
The operation optimization method of the steam power system provided by the invention is used for carrying out steam balance analysis and overall optimization evaluation on the operation condition of the steam power system in the coal chemical industry, comprises bottleneck solution, heat loss evaluation, temperature and pressure reduction device optimization, project modification suggestion and the like, and comprehensively simulates the modification scheme of a part of steam using parts to obtain an optimization evaluation conclusion. And is illustrated by the following examples.
The operation optimization method of the steam power system provided by the invention is used for searching and solving the pipe network bottleneck problem. Obtaining a flow velocity distribution and pressure drop curve of a pipe network through model calculation; the lines with faster flow rates (over 30m/s) or higher pressure drops (about 0.1MPa per 1000 m of line) were analyzed for reasons that caused the pressure loss bottlenecks.
The operation optimization method of the steam power system provided by the invention is used for evaluating the heat preservation of the pipeline and comprises the following steps: and (3) actually measuring the starting point temperature, the tail end temperature and the surface temperature of the pipeline (uniformly distributed on the pipeline), comparing the measured values with the simulation result to obtain parameters such as actual heat flow, design heat flow, qualified heat flow and the like, and comprehensively evaluating the heat dissipation of the pipeline. The method is based on the simulation technology to evaluate the heat preservation effect, and is more scientific and accurate than the conventional evaluation method.
The operation optimization method of the steam power system provided by the invention is used for optimizing the temperature and pressure reducers of the whole plant. Firstly, the steam demand conditions of steam consuming equipment (which cannot be limited to an inlet of the device and must go deep into the equipment in the device) in each device are known, including the steam quantity and the steam quality; classifying according to the real demand condition; knowing the conditions of temperature and pressure reduction in each device and analyzing the reasons for temperature and pressure reduction; on the basis of meeting production requirements and guaranteeing safe operation, the matching of a pipe network and equipment is reasonably optimized, and measures for reducing the temperature and pressure reduction amount are provided.
The operation optimization method of the steam power system provided by the invention solves the problem of steam emptying of the steam power system of industrial enterprises. Under typical working conditions of an enterprise in summer, the steam production of the device A is 270t/h greater than the requirement of the devices in the whole plant; the power station recovers about 210 t/h; therefore, 60t/h of air is also required to be discharged, and energy waste is caused. Under the working condition in winter, the steam yield of the device A is 230t/h greater than the requirement of the device in the whole plant; the power station recovers about 220 t/h; therefore, the air is also emptied for about 10t/h, which causes energy waste.
The operation optimization method of the steam power system provided by the invention analyzes the reason of emptying. The result shows that the pipe diameter of the pipeline in the thermoelectric central boundary area is DN 250. Under typical working conditions in summer, the steam is recovered by the thermoelectric center for 60t/h, the flow rate reaches more than 50m/s, and the bottleneck effect is obvious. Due to the problem of pipeline bottleneck, the steam pressure drops greatly, and the pressure reaching the boundary area of the thermoelectric center can not meet the production requirement, so that the further recovery of the steam in the thermoelectric center is limited, and a large amount of emptying is caused.
Further solutions are provided: and a reasonable steam using point is found to eliminate excess steam. The inside of the device A and the like cannot be added with a new steam consuming point, so that only the heating steam of the thermoelectric center can be replaced. The surplus steam is less under the working condition in winter, and the amount of the recovered steam can be increased by slightly increasing the operating parameters, so that the aim of eliminating emptying is fulfilled. Under the summer operating mode, steam is surplus more, because reasons such as aforementioned thermoelectric center junctional zone bottleneck, a large amount of steam can't be retrieved, consequently need reform transform the pipeline at thermoelectric center.
Namely, a complex line of DN400 is added in the thermoelectric central boundary area; the inside of the thermoelectric center also requires the addition of two DN200 lines to the final steam plant.
The operation optimization method of the steam power system provided by the invention analyzes the modified system; under the working condition of summer, when the steam of the outer pipe network is excessive, a newly-added overline is used, so that the final steam consuming equipment uses external vented steam; under the working condition in winter, the temperature of the heater is increased to control the consumption of redundant steam.
Furthermore, the economic benefit brought by the invention is 1829.1 ten thousand yuan, wherein, under the working condition of summer: the average reduction steam emptying is calculated according to 40t/h, the price of desalted water per ton is calculated according to 21 yuan, and the economic benefit of saving water under the working condition in summer (7 months) is 423 ten thousand yuan; the heat value of each ton of coal of the recovered heat energy reduced power station coal consumption is 20000kJ/kg, the price of each ton of coal is calculated according to 400 yuan, and the economic benefit under the working condition of summer is about 1200 ten thousand yuan; therefore, the total economic benefit under the working condition of summer is 1623 ten thousand yuan. Under the working condition of winter, the economic benefit of saving water under the working condition of winter (5 months) is 67.5 ten thousand yuan according to the average recycled 9t/h demineralized water, and the economic benefit of reducing the coal consumption is about 138.6 ten thousand yuan, so the total economic benefit under the working condition of winter is 206.1 ten thousand yuan.
Fig. 2 is a schematic structural diagram of an operation optimization system of a steam power system according to the present invention, and as shown in fig. 2, the operation optimization system of a steam power system according to the present invention includes: the system comprises a data acquisition module 201, a running operation parameter model construction module 202, a running operation parameter determination module 203, an objective function establishment module 204, an optimal running operation parameter determination module 205 and a running operation module 206.
The data acquisition module 201 is used for acquiring performance characteristic parameters, process parameters and topological structures of equipment in the steam power system; the equipment comprises a power boiler, a steam turbine, a temperature and pressure reducing device, a deaerator, a steam heater, a condenser, a water feeding pump, a waste heat boiler and a steam pipe network; the performance characteristic parameters comprise evaporation capacity, pressure and temperature of a power boiler, steam inlet capacity, high-pressure steam extraction pressure, high-pressure steam extraction temperature, low-pressure steam extraction capacity, low-pressure steam extraction pressure, low-pressure steam extraction temperature, steam exhaust capacity, steam exhaust vacuum degree and rated power of a steam turbine, outlet flow, outlet pressure, outlet temperature and pressure and temperature of temperature-reducing water of a temperature-reducing pressure reducer, working pressure of a deaerator, the number of tubes, the diameter of the tubes, the length of the tubes and outlet control temperature of a steam heater, the number of the tubes, the diameter of the tubes, the length of the tubes and the flow and inlet temperature of circulating cooling water of a condenser, a lift curve, an efficiency curve and a working frequency of a water supply pump, steam production capacity, steam production pressure and steam production temperature of a waste heat boiler, a flow topological structure of a steam pipe network, and pipe diameter, wall thickness, pipe length, heat preservation and rated power of a pipeline, Elbows and valves; the process parameters include annual operating time, system power requirements, fuel data, operating conditions, and system exhaust emissions.
The operating parameter model building module 202 is configured to build a mathematical model of the steam power system according to kirchhoff's law, an energy conservation equation and a mass conservation equation of the steam power system, and performance characteristic parameters, process parameters and a topological structure of the plant.
The operation parameter determination module 203 is configured to solve the steam power system mathematical model to obtain operation parameters.
The objective function establishing module 204 is configured to establish an objective function with the lowest energy consumption and cost as a target, the operating parameters as decision variables, and the performance characteristic parameters, the process parameters, and the topological structure of the equipment as constraints.
The optimal operating parameter determination module 205 is configured to determine an optimal operating parameter according to the objective function.
The operating module 206 operates the operation of the steam power system according to the optimal operating parameter.
The operating parameter model building module 202 specifically includes: the system comprises a hydraulic model determining unit, a heat transfer model determining unit and a steam power system mathematical model determining unit.
The hydraulic model determining unit is used for determining a hydraulic model of the steam power system according to kirchhoff's law, an energy conservation equation and a mass conservation equation of the steam power system, and performance characteristic parameters, process parameters and a topological structure of the equipment.
The heat transfer model determining unit is used for determining a heat transfer model of the steam power system according to kirchhoff's law, an energy conservation equation of the steam power system, and performance characteristic parameters, process parameters and a topological structure of the equipment.
The steam power system mathematical model determining unit is used for constructing the steam power system mathematical model according to the hydraulic power model and the heat transfer model.
The operating parameter determining module 203 specifically includes: the operating parameter determination unit is operated.
And the operation parameter determining unit is used for solving the mathematical model of the steam power system by utilizing a Newton-Raphson algorithm to obtain operation parameters.
The invention provides a steam power system running operation optimizing system, which further comprises: a verification result determining module and an optimizing module.
And the verification result determining module is used for verifying the mathematical model of the steam power system to obtain a verification result.
And the optimization module is used for optimizing the mathematical model of the steam power system according to the verification result.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the system disclosed by the embodiment, the description is relatively simple because the system corresponds to the method disclosed by the embodiment, and the relevant points can be referred to the method part for description.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (8)
1. A method for optimizing operational operation of a steam power system, comprising:
acquiring performance characteristic parameters, process parameters and topological structures of equipment in a steam power system; the equipment comprises a power boiler, a steam turbine, a temperature and pressure reducing device, a deaerator, a steam heater, a condenser, a water feeding pump, a waste heat boiler and a steam pipe network; the performance characteristic parameters comprise evaporation capacity, pressure and temperature of a power boiler, steam inlet capacity, high-pressure steam extraction pressure, high-pressure steam extraction temperature, low-pressure steam extraction capacity, low-pressure steam extraction pressure, low-pressure steam extraction temperature, steam exhaust capacity, steam exhaust vacuum degree and rated power of a steam turbine, outlet flow, outlet pressure, outlet temperature and pressure and temperature of temperature reduction water of a temperature reduction pressure reducer, working pressure of a deaerator, the number of tubes, the diameter of the tubes, the length of the tubes and outlet control temperature of a steam heater, the number of the tubes, the diameter of the tubes, the length of the tubes and the flow and inlet temperature of circulating cooling water of a condenser, a lift curve, an efficiency curve and a working frequency of a water supply pump, steam production capacity, steam production pressure and steam production temperature of a waste heat boiler, a flow topological structure of a steam pipe network, and pipe diameter, wall thickness, pipe length, heat preservation and rated power of a pipeline, Elbows and valves; the process parameters comprise annual operation time, system power demand, fuel data, working condition and system tail gas emission;
constructing a mathematical model of the steam power system according to kirchhoff's law, an energy conservation equation and a mass conservation equation of the steam power system, and performance characteristic parameters, process parameters and a topological structure of the equipment;
solving the mathematical model of the steam power system to obtain operation parameters;
establishing an objective function by taking the lowest energy consumption and cost as targets, the operating parameters as decision variables and the performance characteristic parameters, the process parameters and the topological structure of the equipment as constraint conditions;
determining an optimal operation parameter according to the objective function;
operating operation of the steam power system in accordance with the optimal operating parameter.
2. The method for optimizing the operation of the steam power system according to claim 1, wherein the step of constructing the mathematical model of the steam power system according to kirchhoff's law, an energy conservation equation and a mass conservation equation of the steam power system, and performance characteristic parameters, process parameters and a topological structure of the equipment specifically comprises the steps of:
determining a hydraulic model of the steam power system according to kirchhoff's law, an energy conservation equation and a mass conservation equation of the steam power system, and performance characteristic parameters, process parameters and a topological structure of the equipment;
determining a heat transfer model of the steam power system according to kirchhoff's law, an energy conservation equation of the steam power system, and performance characteristic parameters, process parameters and a topological structure of the equipment;
and constructing the mathematical model of the steam power system according to the hydraulic model and the heat transfer model.
3. The method according to claim 1, wherein solving the mathematical model of the steam power system to obtain the operating parameters comprises:
and solving the mathematical model of the steam power system by using a Newton-Raphson algorithm to obtain operation operating parameters.
4. The method of claim 1, wherein the solving the steam power system mathematical model to obtain the operating parameters further comprises:
verifying the mathematical model of the steam power system to obtain a verification result;
and optimizing the mathematical model of the steam power system according to the verification result.
5. A steam power system operational optimization system, comprising:
the data acquisition module is used for acquiring performance characteristic parameters, process parameters and topological structures of equipment in the steam power system; the equipment comprises a power boiler, a steam turbine, a temperature and pressure reducing device, a deaerator, a steam heater, a condenser, a water feeding pump, a waste heat boiler and a steam pipe network; the performance characteristic parameters comprise evaporation capacity, pressure and temperature of a power boiler, steam inlet capacity, high-pressure steam extraction pressure, high-pressure steam extraction temperature, low-pressure steam extraction capacity, low-pressure steam extraction pressure, low-pressure steam extraction temperature, steam exhaust capacity, steam exhaust vacuum degree and rated power of a steam turbine, outlet flow, outlet pressure, outlet temperature and pressure and temperature of temperature reduction water of a temperature reduction pressure reducer, working pressure of a deaerator, the number of tubes, the diameter of the tubes, the length of the tubes and outlet control temperature of a steam heater, the number of the tubes, the diameter of the tubes, the length of the tubes and flow and inlet temperature of circulating cooling water of a condenser, a lift curve, an efficiency curve and working frequency of a water supply pump, steam production capacity, steam production pressure and steam production temperature of a waste heat boiler, a flow topological structure of a steam pipe network, and pipe diameter, wall thickness, pipe length, heat preservation and rated power of a pipeline, Elbows and valves; the process parameters comprise annual operation time, system power demand, fuel data, working condition and system tail gas emission;
the operation parameter model building module is used for building a mathematical model of the steam power system according to kirchhoff's law, an energy conservation equation and a mass conservation equation of the steam power system, and performance characteristic parameters, process parameters and a topological structure of the equipment;
the operation parameter determining module is used for solving the mathematical model of the steam power system to obtain operation parameters;
the objective function establishing module is used for establishing an objective function by taking the lowest energy consumption and cost as a target, the operating parameters as decision variables and the performance characteristic parameters, the process parameters and the topological structure of the equipment as constraint conditions;
the optimal operation parameter determining module is used for determining optimal operation parameters according to the objective function;
and the operation module is used for operating the operation of the steam power system according to the optimal operation parameters.
6. The steam power system operation optimization system of claim 5, wherein the operation parameter model building module specifically comprises:
the hydraulic model determining unit is used for determining a hydraulic model of the steam power system according to kirchhoff's law, an energy conservation equation and a mass conservation equation of the steam power system, and performance characteristic parameters, process parameters and a topological structure of the equipment;
the heat transfer model determining unit is used for determining a heat transfer model of the steam power system according to kirchhoff's law, an energy conservation equation of the steam power system, and performance characteristic parameters, process parameters and a topological structure of the equipment;
and the steam power system mathematical model determining unit is used for constructing the steam power system mathematical model according to the hydraulic power model and the heat transfer model.
7. The steam power system operation optimization system of claim 5, wherein the operation parameter determination module specifically comprises:
and the operation parameter determining unit is used for solving the mathematical model of the steam power system by utilizing a Newton-Raphson algorithm to obtain operation parameters.
8. The steam power system operational optimization system of claim 5, further comprising:
the verification result determining module is used for verifying the mathematical model of the steam power system to obtain a verification result;
and the optimization module is used for optimizing the mathematical model of the steam power system according to the verification result.
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| PCT/CN2020/103686 WO2021174749A1 (en) | 2020-03-04 | 2020-07-23 | Running operation optimization method and system for steam power system |
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