螺旋藻烟气固碳系统能耗及耦合因子交互关系

Interactive Relationship in CO₂ Spirulina-Fixation System and Energy Consumption Assessment

摘要: 在CO₂利用技术中，微藻固碳因可利用宽浓度CO₂中显示出其特有的优势。微藻固定CO₂体系上游涉及CO₂捕获、提纯与运输，下游涉及CO₂供给与微藻固碳，具有诸多内部交互及与外界环境交互的不确定因素。本研究基于全生命周期理论建立的CCUS-algae模型，通过规模化螺旋藻固碳实践数据，建立了体系中交互耦合的定量关系。上下游交互关系涉及烟气源与捕获净化耦合关系，CO₂源与运输距离耦合关系，CO₂源供给与反应器耦合关系，营养盐与蛋白含量耦合关系。体系与环境交互关系包括辐射、温度与生长率耦合关系。定量评价了环境影响因子对微藻固碳体系的定量影响。从全生命周期角度，针对燃煤电厂和煤化工两种典型燃煤烟气，比较了采用食品级与非食品级螺旋藻固碳的能耗，并与封存技术进行了技术对比。

Abstract: Carbon sequestration by microalgae performs its unique advantage on available for wide range of CO₂ concentration in CCUS technologies. The upstream of CO₂ fixation system involves CO₂ capture, purification and transportation, while the downstream involves CO₂ supply and algal carbon fixation. There are several coupling impacts in system and uncertain factors with external environmental conditions. The CCUS-algae model, based on full life cycle theory, was established to quantitatively evaluate the effects of coupling factors, including relationship of flue gas with capture purification and transport distance, relationship of CO₂ source supply with the type of bioreactor, relationship of nutrient supply with protein content. The effects of environmental impact factors of radiation and temperature on growth rate were established according to a practical large-scale algae cultivation. The flue gas from coal-burning power plant or coal chemical industry is compared with this approach for cultivating algae as edible food and biomass. The energy consumption of the system is optimized by coupling the upstream and downstream key factors from the perspective of the whole life cycle, and the energy consumption of carbon sequestration is compared with CO₂ storage technology.