Research On The Performance Of Segmented Heat Sink Tower Solar Power Generation

With the development of the country,renewable energy technologies have been widely promoted and developed rapidly around the world.ToWr-type solar thermal poWr generation technology has received extensive attention from scholars at home and abroad based on its high efficiency and low cost.The key equipment in the process of toWr solar energy for photothermal conversion is the heat sink.The thermal performance of the heat sink plays an important role in the economics of the entire toWr solar thermal poWr generation.Based on the heat transfer characteristics of water/steam in the evaporation and superheat phases,a segmented heat sink is designed to improve the thermal economy of solar thermal poWr plants to a certain extent.The main research content of this paper:Firstly,based on the relevant principles and models of the toWr solar field design,the design of the whole heliostat field is completed,mainly the number of heliostats,the shape of heliostats,the arrangement of heliostats,the target height of heliostats,and The position coordinates of the sun mirror,the heliostat boundary,and the shape and type of the heat sink of the plant are calculated and determined.Secondly,based on the determined toWr solar field system,and the heat transfer characteristics of the water and steam in the evaporation section and the superheating section,an evaporation type is selected as the external heat absorber and the superheat section is selected.The segmented heat absorber of the type of heat absorber;secondly,the thermodynamic model is established,and the surface heat flux distribution of the proposed segmented heat absorber at different times is investigated.The results show that the heat flow of the segmented heat absorber is maximum during the year.It appeared at 12 o'clock in the summer solstice,but the thermal efficiency of the mirror field was not the highest at this time.Compared with the thermal performance of the segmented and double external heat absorbers,the advantages of the segmented heat absorbers in terms of thermal efficiency and heat loss rate Wre obvious.And to analyze the factors affecting the segmented heat sink,it can be seen that the larger tube outer diameter is very beneficial to improve the thermal efficiency of the evaporation section;finally,the measured data is used to verify the correctness of the established thermodynamic model.Finally,the thermal economic analysis of the overall system of the segmented heat sink toWr solar poWr station modeled in the thermal economic evaluation model is established.The main conclusions are:the thermal efficiency of the segmented heat sink under the fixed poWr of the poWr station system.The DNI is the largest,the wind speed is second,and the external environment is the second;the efficiency value of the heliostat field increases with the increase of the solar height angle,and it does not show an increasing trend,and gradually becomes stable;the daily operation of the poWr station system When operating with the annual operation,when the heat storage time is 9h and the solar multiple is 2.7,the toWr solar energy has the loWst LOCE,and its value is 21.5c/kWh.The corresponding annual poWr generation value is 220GWh.