Analysis Of The Middle-Temperature Collector Based On Combined Solar And Geothermal Power Generation

In this paper, to Tibet Yangbajing Geothermal Power Station as the background, the trough solar collector system provides 250 ? temperature heat source for geothermal power plant. The main work of this paper is as follows:(1) The working principle of the solar thermal power generation system and the three types of geothermal power generation technology are introduced respectively. Solar energy and geothermal energy system structure was proposed according to the above introduction:medium temperature solar trough set heat exchanger and two-stage expansion geothermal power generation system combined system. According to its structure and three kinds of operating conditions, the working principle of the combined power generation system are introduced in detail, and analysis thermal performance of geothermal power and solar energy combined power generation.(2) The functions and features of Aspen Plus software is introduced, the simulation using the sequential modular modeling idea and one-dimensional ·equations of the Wegstein iterative simulation convergence method are illustrated in this paper. Secondly the electronic system of geothermal modeling to verify the correctness of the model, solar energy in thermal system modeling and applied to examples, finally, the solar energy and geothermal energy combined generation system is simulated and analyzed.(3) The design of small condenser are introduced from the structural design of reflector parabolic curve, a bracket, tracking strategy selection and assembling and machining precision; and the key technology of solar vacuum heat collecting pipe is introduced in detail from metal glass sealing connection technology, selective absorption coating and expansion joints and other aspects, which shows that the heat collecting pipe can satisfy the solar energy heat utilization.(4) Through the analysis of vacuum heat collecting pipe heat loss model by heat loss equation, mathematical model of thermal efficiency and the working fluid outlet temperature is obtained. On the basis, the vacuum tube solar collector thermal performance calculation of the interface is written through the MATLAB software and validate the correctness of a one-dimensional heat transfer model established in this paper. At last, use the procedure of this study to the temperature of straight through vacuum heat collecting tube for analysis and research.