Study On Characteristics Of Parabolic Trough Solar Power System

The rapid development of China’seconomy has a growing demand for power. The main energy structure of coal-fired leads to a sharp shortage of energy and environmental degradation. As the principal mode of massive power generation through solar energy in the future, the Concentrating Solar Power(CSP) technology is expected to have approximate power-generation cost as that of the fossil-fired power generation, nowadays parabolic trough thermal power generation system is one concentrated solar thermal power generation mode of the highest degree of commercialization and economical efficiency. The power generation technology of Trough type solar energy directly generating steam can effectively increase the trough type solar thermal power generation system performance, reduce power generation cost.This thesis adopts the modular modeling method to study the dynamic simulation model for the Solar Thermal Power Plant using Direct Steam Generation in Parabolic Trough Collectors filed(DSG-PTC-STPP) without heat storage and recirculation. The main contents are as follows:The thermal performance model for the trough Solar Collector Assembly(SCA) is studied.On considering the aspects affecting the heat transfer and flowing of the working-medium, and calculating the heat transfer processes,the thermal performance model forthe Solar Collector Element(SCE) is built by combining the fundamental formula of the sun position astronomical algorithm, the accurate heat absorption for the dynamic model of the SCE could be provided from the model.The real-time dynamic simulation model of the DSG-PTC-STPP system is developed. Based on the mass and energy conservation formula and the fundamental knowledge of the relative specialties, the mathematic model for the preheating section, evaporation section and superheated section of the collector and the steam-water buffer separator have been studied. Taking the STAR-90 simulation supporting system as the platform, the dynamic simulation models for the INDITEP power station thermodynamic system are built respectively, and carry out the simulation test, the disturbance test and characteristic analysis, the simulation experiment results show that the established simulation model can correctly reflect the dynamic characteristics of a thermodynamic system and the whole operation process, providing more reliable scientific evidence to development of DSG-PTC-STPP real-time simulation system and the design, debugging and verification of unit of same type.