Utilization Of The Exergy Theory In Energy Audition

With the high speed development of economic and the acceleration of industrialization and urbanization in China, energy crisis and environment pollution caused by energy consumption become more and more severe. It has been the major factor to prevent the development of economic and the society. To improve the energy using efficiency, optimize the energy structure and make sure the energy supply safely and stably will be the most important issue.To achieve the energy development strategy, the government has adopted several macro-polices. Energy audit is one of these polices. It is a professional process that auditors check the enterprises operation including both physical and financial aspects. To a certain extent, energy audit pushes the enterprise to save energy. Whereas, energy audit is on the elementary stage;the theory and the method of energy audit has large room to improve.Exergy analysis is a method to estimate the energy system through the exergy theory. This method not only discloses the quantity of the energy losing but also the quality of the energy and the reason why energy loses. Base on this analysis, corresponding measure can be adopted to save energy. In nowadays, few studies are on the energy audit and how to improve the audit method, especially the exergy analysis. In this paper, the thought of using exergy theory into energy audit was put forward. And the study on the exergy analysis and application method was conducted. The main work is as below:(1) Study on the exergy analysis methods of different facilities and translate them to the form that can be easy used in energy audit. It mainly aims to establish the frame for the common sections and the basic concept of the exergy analysis.(2)Establish the "Exergy network chart" method to show how exergy stream flows through the network chart. This method will be better to analysis the energy system and more easily to find the weak point than the energy network chart method.(3)Set new project evaluated standard based on the thermo-economics and exergy theory. This standard will be more integrity as it considers both economic aspect and physical aspect.(4) The classical energy system was optimized based on the exergy analysis. In this paper the sewage sludge and coal co-combustion power generation system was studied to give some references to the utilization in the exergy audit.