CN-121683143-B - Method and system for dynamically simulating supply and demand abrupt change hydrothermal coupling of long-distance heat supply pipe network

CN121683143BCN 121683143 BCN121683143 BCN 121683143BCN-121683143-B

Abstract

The invention discloses a method and a system for dynamically simulating supply and demand abrupt change hydrothermal coupling of a long-distance heat supply pipe network, which belong to the technical field of central heat supply and adopt the technical scheme that topological structure parameters, elevation, pipeline structure parameters, heat preservation layer structure parameters and environmental parameters of the heat supply pipe network are acquired; the method comprises the steps of constructing a node association matrix, setting heat source parameters, physical parameters, mutation working condition parameters and space step length, carrying out initial hydraulic calculation to obtain flow of each pipe section of a heat supply pipe network and pressure distribution of each node, carrying out time propulsion calculation on a temperature field in the pipe network when supply and demand loads are suddenly changed, synchronously updating physical parameters of heat supply media and hydraulic states of the pipe network in the calculation process of the temperature field, realizing dynamic simulation of coupling of hydraulic power and heating power, and analyzing heat storage or heat release processes of the heat supply pipe network under the supply and demand load suddenly changed working conditions on the basis of the dynamic simulation of coupling. The method and the system have the beneficial effects that the method and the system for dynamically simulating the supply and demand abrupt change hydrothermal coupling of the long-distance heat supply network are provided.

Inventors

XIE CHUNLIN
LIU SHUHAO
YIN CHENGLEI
SHANG HONGTAO
REN ZONGFU
GAO KAIKAI
ZHOU SHOUJUN

Assignees

济南能源工程集团有限公司

Dates

Publication Date: 20260508
Application Date: 20260206

Claims (3)

1. S1, under the initial stable operation working condition of a heating system, obtaining topological structure parameters, elevation, pipeline structure parameters, heat preservation layer structure parameters and environmental parameters of different laying modes of the long-distance heat supply pipe network; s2, constructing a node association matrix, and setting pipe network operation parameters, physical parameters, mutation working condition parameters and space step sizes; S3, performing initial hydraulic calculation by adopting a node flow method to obtain flow of each pipe section of the heating pipe network and pressure distribution of each node; s4, on the basis of an initial hydraulic calculation result, performing time propulsion calculation on a temperature field in the pipe network when the supply and demand load is suddenly changed, and synchronously updating physical parameters of a heating medium and the hydraulic state of the pipe network in the calculation process of the temperature field so as to realize the coupling dynamic simulation of hydraulic power and heating power; S5, carrying out statistical analysis on the heat storage or heat release process of the heat supply pipe network under the supply and demand load abrupt change working condition on the basis of coupling dynamic simulation to obtain corresponding heat storage or heat release and temperature change curves with time; the pipeline structure parameters comprise pipeline length, pipe diameter and pipeline heat conductivity coefficient, the heat insulation layer structure parameters comprise heat conductivity coefficient and thickness of the heat insulation layer, the environment parameters comprise soil temperature and burial depth under direct burial; The construction of the node association matrix comprises the construction of the node association matrix according to the numbers of pipe sections and nodes and the topological structure of a pipe network; s3, setting the flow of the pipe section initially; Calculating resistance characteristic coefficients of each pipe section according to the inner diameter and length parameters of each pipe and forming a diagonal matrix of the resistance characteristic coefficients; based on a node continuous equation, an equation set for solving node pressure is established through a pipeline section pressure drop calculation formula, and pipeline section flow is iteratively corrected until calculation accuracy is met; Calculating according to the set reference node pressure to obtain the pressure value of each node of the pipe network, and superposing the pump lift and the pressure drop for overcoming the elevation difference to obtain the flow of each pipe section and the pressure distribution of each node; Calculating the resistance characteristic coefficient at least by considering the equivalent absolute roughness of the pipe wall, the length of the pipe section, the equivalent length of the local resistance and the average density of fluid media in the pipe; The step S4 comprises the following steps: S41, initializing a pipeline network node temperature field, S42, calculating pipeline thermal resistance according to the inner diameter, the outer diameter and the length of each pipeline section, calculating thermal resistance of the heat insulation layer according to the thermal conductivity coefficient and the thickness of the heat insulation layer, overhead laying, calculating air thermal resistance according to the environmental parameters of air temperature and wind speed, directly burying, calculating soil thermal resistance according to the buried depth, and then calculating total thermal resistance of each pipeline section, S43, calculating the flow rate of each pipeline section according to the pipeline section flow rate of a hydraulic steady-state calculation result, and calculating the maximum allowable time step according to the C.F.L condition; s45, updating the density and specific heat of the medium by utilizing the temperature of the current node and combining the initial hydraulic result, and reconstructing a diagonal matrix of the resistance characteristic coefficient; S46, reestablishing an equation set based on a node continuous equation to iteratively solve node pressure and pipe section flow so as to realize synchronous updating of hydraulic and thermal states; s47, repeating S44-S46 until all the space step sizes are completed; s48, judging whether the current time layer meets the requirement, whether the pipe network is stable or not, forming an equation set, performing successive approximation until the temperature of the k+1th layer time layer pipe network is stable or exceeds the iteration time, and entering the next step; S49, taking the temperatures of the same time layer of different nodes to obtain the temperature distribution of pipe networks under different time; The demand mutation working condition comprises at least one of a quality regulation mode, a quantity regulation mode and a flow regulation mode, wherein the quality regulation mode is used for increasing the water supply temperature to deal with load mutation under the condition that the flow of a pipe network is unchanged, recovering the water supply temperature after heat storage is completed, and the quantity regulation mode is used for increasing the running flow of the pipe network to deal with load mutation under the condition that the water supply temperature is unchanged, and stabilizing the flow after the heat storage is completed.
2. A long-distance-transmission heat supply network supply-demand abrupt-change hydrothermal coupling dynamic simulation system for realizing the dynamic simulation method of claim 1, comprising: The system comprises a data input module, a parameter setting module, a primary hydraulic calculation module, a hydraulic-thermal dynamic calculation module, a pipe network analysis module and a temperature-thermal dynamic calculation module, wherein the data input module is used for inputting pipe network topological structure parameters, elevation, pipeline structure parameters, heat preservation structure parameters and environmental parameters of different laying modes under an initial stable operation working condition of a heating system, the parameter setting module is used for constructing a node association matrix and setting pipe network operation parameters, physical property parameters, mutation working condition parameters and space step length, the primary hydraulic calculation module is used for carrying out initial hydraulic calculation by adopting a node flow method to obtain flow of each pipe section of the heating pipe network and pressure distribution of each node, the hydraulic-thermal dynamic calculation module is used for carrying out time propulsion calculation on a temperature field in the pipe network when a supply and demand load is suddenly changed on the basis of an initial hydraulic calculation result, and synchronously updating physical property parameters of a heating medium and hydraulic state of the pipe network in the temperature field calculation process so as to realize hydraulic and thermal coupling dynamic simulation, and the pipe network analysis module is used for carrying out statistical analysis on a heat storage or heat release process of the heating pipe network under the supply and demand load sudden change working condition on the basis of the coupling dynamic simulation so as to obtain corresponding heat storage capacity or heat release and temperature change curve with time.
3. An electronic device, comprising a processor and a memory, wherein the processor is configured to execute a program stored in the memory for a long-distance heat supply network supply-demand abrupt hydrothermal coupling dynamic simulation method, so as to implement the dynamic simulation method according to claim 1.

Description

Method and system for dynamically simulating supply and demand abrupt change hydrothermal coupling of long-distance heat supply pipe network Technical Field The invention relates to the technical field of central heating, in particular to a method and a system for dynamically simulating supply and demand abrupt change hydrothermal coupling of a long-distance heat supply network. Background Along with the continuous expansion of the central heating scale of towns, the long-distance heat supply network is widely applied to regional heating systems due to long conveying distance and wide coverage range. The heat supply pipe network has the characteristics of large pipe diameter, long pipe line, high water capacity of the system and the like, and ensures the large-scale heat supply requirement and simultaneously makes the operation characteristic of the system more complex. In the actual operation process, the long-distance heat supply pipe network is easily influenced by factors such as heat source output change, power grid dispatching, user side load fluctuation, meteorological condition mutation and the like, and the heat supply and demand mutation working condition frequently occurs. When the load on the supply side or the demand side is suddenly changed, the pressure, the flow and the temperature distribution in the pipe network are changed, and if the pressure, the flow and the temperature distribution are improperly regulated, the fluctuation of the tail end heat supply temperature, the instability of a hydraulic system and even the influence on the heat supply safety and the heat supply quality are easily caused. The existing heat supply network operation analysis and regulation technology mainly uses steady state calculation, and generally assumes constant system working conditions, so that the time-varying characteristics of the network parameters in the supply and demand mutation process are difficult to reflect. Although some technologies introduce a dynamic analysis method, the calculation process is complex, the calculation amount is large, and the requirements of engineering operation on the calculation efficiency and the practicability are difficult to meet. In addition, the prior art focuses on heat source or user side regulation, often ignores heat storage and buffer capacity of a long-distance heat supply pipe network, and is difficult to quantitatively analyze heat storage release characteristics of the pipe network in a load mutation process. Therefore, how to comprehensively analyze the hydraulic characteristics, the thermal response and the pipe network heat storage capacity of a long-distance heat supply pipe network under the supply and demand mutation working condition while ensuring the calculation efficiency is still a technical problem to be solved. Disclosure of Invention The invention aims to provide a method and a system for dynamically simulating supply and demand abrupt change hydrothermal coupling of a long-distance heat supply network. The invention is realized by the following measures: The first aspect provides a method for dynamically simulating supply and demand abrupt change hydrothermal coupling of a long-distance heat supply pipe network, which is characterized by comprising the following steps of S1, acquiring topological structure parameters, elevation, pipeline structure parameters, heat preservation layer structure parameters and environmental parameters of different laying modes of the long-distance heat supply pipe network under an initial stable operation working condition of a heat supply system; s2, constructing a node association matrix, and setting pipe network operation parameters, physical parameters, mutation working condition parameters and space step sizes; S3, performing initial hydraulic calculation by adopting a node flow method to obtain flow of each pipe section of the heating pipe network and pressure distribution of each node; s4, on the basis of an initial hydraulic calculation result, performing time propulsion calculation on a temperature field in the pipe network when the supply and demand load is suddenly changed, and synchronously updating physical parameters of a heating medium and the hydraulic state of the pipe network in the calculation process of the temperature field so as to realize the coupling dynamic simulation of hydraulic power and heating power; and S5, carrying out statistical analysis on the heat storage or heat release process of the heat supply pipe network under the supply and demand load abrupt change working condition on the basis of coupling dynamic simulation to obtain corresponding heat storage or heat release and temperature change curves with time. Further, the pipeline structure parameters comprise pipeline length, pipe diameter and pipeline heat conductivity coefficient, the heat insulation structure parameters comprise heat conductivity coefficient and thickness of a heat insulation layer, the environment paramet