Research And Application Of Model-Based Real-Time Optimization Of City-Level Steam Heating System Operation And Scheduling

With the development of China's economy and the acceleration of urbanization.Smart cities have become a new trend in the development of global cities,and the connotation is that cities use a newer way to improve their core systems by using the new generation of information technology with the Internet of Things,cloud computing,etc.as the core,thereby optimizing and maximizing Use limited energy.As an important energy subsystem in the urban system,the urban heating system is naturally an important part of the construction of a smart city.The proposal of smart heating is in line with the general background of comprehensively promoting the energy production and consumption revolution strategy and building a "smart city".As the construction scale of urban heating pipelines continues to expand,the types,density and complexity are also increasing,and the areas and functions they undertake are also getting larger and larger.However,in recent years,problems such as thermal pipeline explosion accidents,water leakage,air leakage,and pipeline corrosion still exist.Part of the reason is that our form of heating is still relatively extensive,and part of the reason is due to the discrete heating method.Its brutal consumption of energy,disorderly emissions,and serious running and dripping have hindered the smart heating of cities in China.development of.City-level steam heating systems are required to stimulate "chain reforms" in energy technology,production,and supply.On the one hand,improve energy utilization efficiency and guide energy consumption toward intensive and clean development;on the other hand,promote the transformation and development of China's energy industry's industrial layout towards a more refined and diversified direction.The city-level central heating system in the southern region can not only replace a large number of small and medium-sized industrial boilers,but also significantly improve energy saving and emissions reduction in industrial production.At the same time,the central heating system in the south is also closely related to the energy supply of people's livelihood in large public buildings such as hospitals,shopping malls,and complexes,and is an important energy infrastructure to support the production and life of urban people.Therefore,it is of great significance to analyze the operation status and optimize the operation of urban heating systems.This paper builds a real-time optimization model for the operation and dispatch of urban-level heating systems,and establishes operational evaluation indicators based on economics,safety,and steam quality.By comparing the indicators of different schemes,a real-time optimized scheduling scheme for a multi-heat source city-level steam heating system is obtained.The main research contents are as follows:A hydraulic and thermal model of a multi-heat source urban steam network is established in this paper.Compared with the traditional modeling method,the model established in this paper focuses on the laying and heat dissipation of urban steam heating networks,and appropriately improves the original steam thermal hydraulic model.Based on the law of conservation of energy,a heat storage model for a city-level steam heating network was established,and the optimal scheduling method for heat storage and energy release of the pipeline was studied.A real-time optimization model for multi-source urban steam heating system operation scheduling was proposed.From the perspectives of economy,steam supply quality,and safety and stability of the heating network operation,an index for evaluating the operation adjustment scheme was established,and multi-source urban steam was determined Objective function for real-time optimization of heating system operation scheduling.It is using the model established above to solve a city-level steam heating network model.By comparing the steam consumption quality of hot users in the decommissioning operation and the grid-connected operation,according to the proposed optimized operation index,a more reasonable operation mode is selected,which provides a scheduling basis for the safe,reliable,and efficient operation of the urban steam heating network.The grid-connected operation of the S double line and the S line optimizes the pressure distribution of the pipe network,improves the quality of steam and the safety and reliability of the pipe network operation,and the relative stability improvement rate is between 1.5% and 30.2%.Based on the optimized scheduling method of the heat storage characteristics of the steam pipe network,the energy storage characteristics of the city-level heat supply network are used for the optimal scheduling.The steam supply scheme using the heat storage characteristics and the operation scheme without heat storage are compared to obtain the steam used.The dispatching method of the heat storage energy storage characteristics can effectively reduce the peak heat consumption during the day,and can alleviate the peak heat consumption by about 17.5t / h at most,which plays a role of peak clipping and valley filling.At the same time,the dispatching method using the energy storage characteristics of the steam heating network is safer than a pipe network that does not use the energy storage characteristics of the steam pipe network.The reasonable use of the energy storage characteristics of the pipeline can effectively reduce the temperature of the important monitoring pipelines,which can reduce up to about 5 ° C.Reduce hidden dangers of pipeline over-temperature and achieve efficient and safe operation.