Life Cycle Assessment And Green Benefit Optimization Of Small Island Wind Turbine Based On Green Design

The problem of poor green benefit after the installation of wind turbine has become an important factor limiting its application and promotion.Life cycle assessment(LCA)technology can effectively evaluate the green degree of the product,so as to feedback and guide the green design of the product.At present,domestic and foreign scholars’ research on wind power LCA mostly takes large and medium-sized wind turbines as the object,and the huge structural difference between them and small wind turbines leads to the difference in evaluation methods and models of the two.At the same time,the entire life cycle of small wind turbines is relatively complex,and there are more space-time factors.Therefore,the paper introduces the LCA method to carry out evaluation research on small wind turbines,constructs a specific evaluation system for small wind turbines,and puts forward the concept of "scenario" to introduce it into the evaluation work.Based on the energy payback time index,the green benefit of the small wind turbine is evaluated in advance.Finally,the green benefit of the small wind turbine is optimized by referring to the assessment process,combined with the island environmental conditions,and using corresponding strategies.The specific research contents are as follows:First,drawing on the assessment system of large-scale wind turbines,building an LCA evaluation system of small wind turbines through research on the LCA technical framework.Establishing a small wind turbine inventory analysis stage model;determining the impact evaluation method CML and evaluation software Ga Bi.Getting the overall evaluation system,for the follow-up small wind turbine green benefit application analysis to establish the basis.Secondly,based on the payback time index,a dynamic multi-scenario LCA pre-installation evaluation method is proposed.Aiming at the problem that the LCA evaluation has less time and space considerations in the past,the concept of "scenario" is put forward and used in the evaluation work to make the calculated energy consumption evaluation result more accurate;Refer to the meteorological data of the specific installation location and use the probability theory method to make the calculated annual wind turbine power generation more realistic;According to the specific payback time obtained by the index definition,evaluate the green benefits of small wind turbines after installation,and then avoid the waste of resources caused by improper installation schemes.Then,using the evaluation method,a 300 W H-type wind turbine was used as theevaluation object to evaluate the green benefits of the wind turbine installed on two islands in the South China Sea(hereinafter referred to as "South")and the East China Sea(hereinafter referred to as "East").Use the established evaluation system and introduce scenario factor analysis to calculate the total input energy of the multi-scenario life cycle of the wind turbine;The power data of the wind turbine is obtained through the power characteristic experiment,and the wind power density function obtained by referring to the weather data is used to calculate the annual power generation;Finally,the energy compensation time is calculated.There are no scenarios 2.34a(south)and 2.16a(east),and multiple scenarios 2.12a(south)and 1.96a(east).The average life of the wind turbine is20 a.The results show that this method can be effective Pre-evaluate the green benefits of small wind turbines after installation;the assessment results of the South China Sea and East China Sea islands are more accurate after the introduction of scenario factors.Finally,referring to the entire pre-assessment process,some optimization strategy for the green benefits of small island wind turbines in a complex environment is proposed.Reduce the life cycle energy consumption of the wind turbine by replacing the blade material,transportation mode and using recyclable design;Adopt the strategy of reducing the probability of failure(the system’s annual downtime is relatively reduced by 15.88%)to increase the annual power generation of the wind turbine;The design of the folding blade fan realizes normal power generation in windy weather without artificial forced shutdown,and the service life is greatly extended,thereby improving the green benefit of the wind turbine.In addition,the application of wind-solar hybrid power generation system,application of wind-induced vibration energy collector,design and application of a wind-lamp integrated multi-function street lamp,can improve the power generation quality of the wind power system to a certain extent,reduce waste of resources,save production energy and manufacturing materials,and effectively improve the green benefits of the entire power generation system.