A Power Plant Thermal System Analysis Method Based On Energy-Efficiency Distribution Matrix Equation

The coal-fired power plant is not only a huge power generator, but also a huge energy consumer, which is the main form in our electric power industry for a long period.As the inspection tools, the research on the thermal economic analysis method has an important theoretical and practical meaning for being not only the theoretical foundation of the thermal system designing and technical reconstruction, but also the practical technique of the realtime analysis of thermal equipment economically run in power plant.Especially, with the rapid development of applied mathematics and computer, new requests have been put forward in the study of the thermal system analysis method.It has been a new hotspot in its study field that how to increase the analysis method's versatility, intelligence, accuracy and being suitable for computerization.Based on the study of the present thermal system analysis method, the energy-efficiency distribution matrix (EEDM) equation has been derived directly from circle efficiency calculation expression in normal energy balance method by a strict mathematic derivation.Compared with the present matrix methods, there is a one-to-one corresponding relationship between the topologic configuration of the EEDM equation and actual thermal system configuration, and its matrix element values reflect the thermal parameters of the actual thermal system.Moreover, the matrix equation contains the special element that can express the power plant thermal economic indexes (circle efficiency) directly.The structure and thermal characteristics of the thermal dynamic system can be expressed in mathematics conveniently.All of above have made the analysis method based on the EEDM equation more strict and scientific.In local quantitative analysis of auxiliary system, from the point of view of "merging first, and then analyzing", the conception of a virtual thermal system is proposed.Therefore, the paper constructs the virtual thermal system, which is adapted to EEDM equation, and proposes the universal expression rules of each auxiliary steam-water component.In local quantitative analysis of thermal equipment, the paper has proposed the universal expression rules on the local changes of thermal equipment in the EEDM equation by researching the energy balance equation.Adopting this method can effectively avoid the shortages of the traditional analysis method, such as needing calculating steam-water coefficient of heater in advance, and the question of similarity on analysis model.In thermal system analysis of co-generation unit, the paper has perfected the analysis thought of multiple cycle, and constructed the supplement equation of the EEDM equation.Combined with the EEDM equation, it can analyze the influences of heat and electricity on local quantitative analysis in power plant, which effectively overcome the defect of other traditional thermal system analysis method.The latter can only analyze the influence on electricity.Aiming at each of aspect analysis, the paper proposes the example.Analysis process and results indicate that the analysis method based on the EEDM equation is versatile, intelligent, accurate and suitable for computerization, which is accorded with the current trend of the thermal system analysis method.