Research On Combustion And Pyrolysis Characteristics Of Microalgae And Feasibility Analysis Of Microalgae And Coal Blends Power Generation

With the exploitation and consumption of fossil energy leading to the reduction of energy reserves,as well as the serious environmental pollution and damage caused in the exploitation and utilization process,it is particularly urgent to find new alternative energy,among which renewable energy has always been concerned.Aaquatic microalgae,as a renewable energy—one of the important components of biomass energies,not only has the advantages of wide sources,high photosynthetic efficiency and no occupation of cultivated land,but also is similar to traditional energy utilization.However,compared with coal,microalgae have high water content and unstable ignition,so it is necessary to pretreat microalgae.In this paper,the effects of different pretreatment methods on the combustion and pyrolysis characteristics of microalgae were compared and analyzed to provide a reference for the efficient utilization of microalgae.In this paper,Chlorella vulgaris?a kind of microalgae?was taken as the research object,the weight loss characteristics of Chlorella vulgaris were studied by thermogravimetric analyzer,the effects of different drying methods and drying time on combustion characteristics and pyrolysis characteristics under different heating rates were analyzed,and the kinetic model of the reaction was established,and compared with the traditional drying method.In addition,Chlorella vulgaris and coal blends combustion power generation system and conventional coal-fired power generation system were compared by life cycle analysis and cost estimation,and the advantages and disadvantages of Chlorella vulgaris and coal blends combustion power generation system were analyzed.The main conclusions of this paper were listed as follows:?1?With the increase of microwave drying time,the comprehensive combustion pyrolysis characteristic index S increased.The S of microwave drying for 30min and 40min were higher than that of conventional drying.The S of microwave drying in pyrolysis process was higher than the conventional drying,indicating that the microwave drying method could improve the combustion and pyrolysis characteristics of Chlorella vulgaris.?2?With the value of?increasing,T_i,T_fand R_pall increased,while M_rdecreased,indicating that increasing the heating rate could improve the combustion and pyrolysis characteristics of Chlorella vulgaris.In addition,E and A after microwave drying were lower than the results of traditional drying,indicating that microwave drying method reduced the activation energy required in the combustion and pyrolysis of Chlorella vulgaris.?3?In the case of the production 1k Wh of electric power,the cost of microalgae and coal blends combustion power generation system?0.459yuan/k Wh?was higher than that of conventional coal-fired power generation?0.253 yuan/k Wh?.However,the environment impact potential value?765.091g CO₂eq.?of microalgae and coal blends combustion power generation system was lower than that of conventional coal-fired power generation?830.316g CO₂eq.?,indicating that microalgae and coal blends combustion power generation system is beneficial to the environment.