Performance study and economic analysis of wind supercharged solar chimney power plant

摘要

By setting up the unpowered wind pressure wheel at the chimney top, this paper puts forward the model of "wind supercharged solar chimney power plant (WS-SCPP)". Based on the prototype Spanish solar chimney power plant (SCPP), the physical, mathematical models are built, the performance of WS-SCPP and SCPP are compared and the relationship between chimney height increment and supercharging effect is discussed. The results show that: with the help of unpowered wind pressure wheel, the performance of WS-SCPP improves greatly. At the same turbine rotational speed, the shaft power of WS-SCPP is always higher than that of SCPP. When the speed is 100 rpm, the shaft power of SCPP increases from 37.8kw to 57.03kw, with an increase of 50.9%. The net income and NPV of WS-SCPP are always higher than those of SCPP. The lowest electricity selling price is significantly lower than that of SCPP, with a decrease of 20.1%. When the chimney height of SCPP is increased by at least 80 m, the performance is comparable to WS-SCPP. Wind supercharging technology is one of the effective ways to improve the efficiency and commercial application of SCPP. (C) 2020 Elsevier Ltd. All rights reserved.