| Recent years,the installed capacity of parabolic trough concentrating solar thermal power generation plant(PTCSTPP)has been significantly improved,whereas the overall plant efficiency has yet to be improved.In this paper,an Improved Plant which based on the exist PTCSTPP and the theory of energy cascade utilization was proposed,the simulation models of the 30 MW PTCSTPP and the Improved Plant were established and compared,the thermal economic and techno-economic of the two plants were analyzed under design and operating condition,the heat storage subsystem structures of the two plants were designed which were suitable for the Improved Plant were proposed,and the thermal economic and techno-economic of the two plants which with their heat storage subsystems were analyzed under design and operating condition.First,the structure of 30 MW PTCSTPP which refer to the SEGS VI Plant was analyzed,the simulation model was built by using Ebsilon platform,the data correctness of the model is verified by using the operating parameters of the plant.Based on the simulation model,the thermal economic of SEGS VI Plant is analyzed.Second,the scheme of the Improved Plant was proposed based on SEGS VI Plant,which is using the theory of energy cascade utilization,the parameter optimization model and performance analysis model of the Improved Plant were established,the solar field of it was designed,the thermal economic and techno-economic of the simulation model of SEGS VI and the Improved Plant under design and operation condition were analyzed.The results show that compared with SEGS VI Plant,the Improved Plant can increase the overall plant efficiency by0.24% and 0.22% respectively under the design and operation conditions,and reduce the initial investment and LCOE by 1.24% and 1.54% respectively.Finally,in order to explore the impact of energy cascade utilization theory on the parabolic trough power plants with heat storage subsystem,the subsystems were designed for the SEGS VI Plant and the Improved Plant.The calculation model of energy storage efficiency and the optimization model of molten salt inlet temperature were established,and the parameters of the heat storage subsystem were optimized.The simulation model was established to analyze the thermal economic and techno-economic of the two system with their heat storage subsystems.The results show that,compared with SEGS VI Plant,the overall plant efficiency of the Improved plant was increased by 0.8%,and the initial investment and LCOE of the Improved Plant were decreased by 3.74% and 3.72% respectively,under the same heat storage capacity.It can be seen that the application of the energy cascade utilization theory to the solar field subsystem of PTCSTPP can effectively improve the overall plant efficiency and reduce the initial investment and LCOE.The research of this paper can provide a useful reference for the optimal design of the PTCSTPP. |
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