Life Cycle Assessment And Economic Analysis Of Microalgae Biodiesel

With the progress of society and the rapid development of economy,the demand for electric power increases year by year.And our countryelectricity generation occupies the dominant position still is the firepower.The impact of thermal power on the environment is becoming more and more serious.The reserves of primary fossil energy,such as coal and oil,are shrinking,and countries around the world are looking for alternative sources of energy,such as wind power generation and solar power generation.And power generation technology has made great progress.However,the unstable power supply of wind power generation brings great challenges to the stability of the grid.The cost of photovoltaic power generation is relatively high,its price is twice as high as that of thermal power generation,and the manufacturing process of photovoltaic panels is not environmentally friendly.The biomass energy represented by microalgae has great potential for development and is called green energy.In this paper,the microalgae biodiesel power generation system is used to evaluate the system by using the life cycle assessment method.Through the comprehensive collection of microalgae culture stage,harvest stage,drying stage,transportation stage,pretreatment stage,vegetable oil extraction stage,biodiesel preparation stage,power generation stage data,Then the life cycle assessment method is used to process the data.When 3MW·h was obtained,the total consumption coefficient was 11.66 mm person equivalent,while coal and diesel accounted for 98.97%and 1.03%respectively.The consumption of 2.52L diesel fuel in the transportation phase is 0.046,0.003,0.004 and 0.001,respectively,which indicates that the transportation stage of microalgae is not the main influencing factor to determine the environmental impact of the whole system.And the main impact is in the power generation phase;The local impact of microalgae biodiesel generation is far greater than that of global power generation,while the regional impact is the least.Therefore,the system has little negative effect on the environment and is a kind of environment-friendly power generation system worthy of promotion.Finally,the economy of biodiesel power generation and thermal power generation is compared and analyzed.The resource consumption cost of thermal power generation system is larger than that of biodiesel power generation system,but the external environmental cost is just the opposite.It is mainly related to the production process of biodiesel.