Research On Coupling Characteristics And Integrated Optimization Model Of Energy And Environment Based On DES

With the increasing of electric power demand and world energy consumption, regulating energy construction, raising energy efficiency, improving energy security and solving environmental pollution have become the emphasis of the energy strategy of our country. A new energy supply mode, distributed energy system (DES), shows a promising future in China because of its unique characteristics, which include energy efficiency, economy, environmental protection and reliable energy supply. Distributed energy system is a kind of multi-generation system based on the establishment of energy step utilization. According to the different demands of customers, energy supply is carried out with the match of temperature, energy loss during the transportation decreasing to the lowest and energy efficiency increasing to the highest.One of the advanced subjects in DES field is to realize the optimizing configuration of material and energy among different energy utilization systems in virtue of system integration and combination, to improve the comprehensive utilization efficiency of energy and resource, and to abate the negative effect of fossil fuel utilization on the environment. In additional, for the users of distributed energy systems especially for the building users, with the variation of season, day and night alternation and the time of day, its terminal load requirements vary greatly and periodically, which makes the design of distributed energy systems a difficult task. An optimized distributed energy system design should fully consider these factors and favor the economical and efficient system operation under any working conditions, and the objective function’s accomplishment of economy, energy and environment.The research and development of integrating distributed energy system with environment, renewable resources, compound energy-saving technology and coal chemical industry were firstly overviewed in this paper. The evaluation of environmental benefits was used to identify the differences between distributed energy system and traditional energy system. Integrated effects between distributed energy system and denitration technology were mainly investigated. By the example of Guangzhou Asian-Games City and Guangzhou Higher Education Mega Center, the applications of integrating distributed energy system with renewable resources and compound energy-saving technology were demonstrated in detail.A set of mathematical models established from the point of view of system engineering were used to analyse distributed energy-environment integrated system qualitatively and quantitatively. Based on the engineering technology model, the programming model was set up to characterize and imitate the distributed energy-environment integrated system and to evaluate environmental impact, combining with technologies through energy consumption and energy production. Multi-objective programming models for distributed energy system were established to support optimal operation and configuration. Furthermore, the related analysis conclusions and suggestions were put forward. Based on an overall consideration of various factors, the programming model focused on the interaction and the integrated characteristics between distributed energy and environment.Considering actual districted energy systems with their input energy prices and external climate conditions etc., the optimal design of the integrated gasification multi-generation system under energy, economic and environmental multi-objects functions was investigated, and optimized schemes under different combination, and the influences of time of use prices and cool storage equipments on energy, economic and environmental performances in the life cycle were analyzed.