微藻与塑料混合热解制备低氮低氧富烃液体油  

Microalgae co-pyrolysis with waste plastics to prepare low-O/N and hydrocarbon-rich liquid oil

作　　者：唐紫玥 陈伟[1] 胡俊豪[1] 杨海平[1] 陈应泉[1] 陈汉平[1] TANG Zi-yue;CHEN Wei;HU Jun-hao;YANG Hai-ping;CHEN Ying-quan;CHEN Han-ping(State Key Laboratory of Coal Combustion,School of Energy and Power Engineering,Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]华中科技大学能源与动力工程学院,煤燃烧国家重点实验室,湖北武汉430074

出　　处：《燃料化学学报》2021年第12期1860-1866,共7页Journal of Fuel Chemistry and Technology

基　　金：国家自然科学基金(51906082,51861130362);中国博士后科学基金(2019M662617)资助。

摘　　要：为了减少油中氮氧化合物,提高微藻生物油品质,本研究在固定床上开展了微拟球藻(NS)和聚乙烯塑料(LDPE)的混合热解/催化特性,探讨了O和N在热解气、液、固相的分布,并以此探讨了微藻与LDPE之间的交互作用以及催化剂的加入对混合热解的影响。研究发现,混合热解能有效抑制O和N向油中转移,促进微藻中O转变为H2O,N向气体产物转移。此外塑料添加明显减少了油中羧酸、酰胺和含氮杂环等含氧/氮化合物,提高了脂肪烃含量,同时有效促进碳氢气体的形成,并对CO和H_(2)也有一定的协同作用,特别是在25%LDPE时协同效应最强。同时ZSM-5能促进碳氢气体形成,提高气体产物的热值(35.6 MJ/m^(3)),并进一步减少油中含氮化合物,促进N向气体转移,O向气体和H_(2)O中转移,从而使油中O、N含量明显降低;此外混合催化热解能在一定程度上抑制芳烃的形成,提高脂肪烃选择性。In order to reduce N-/O-compounds content and improve the quality of microalgae bio-oil,the copyrolysis/catalytic of Nannochloropsis sp.(NS)and polyethylene(LDPE)were studied in a fixed bed,and the distribution of N and O was discussed,as well as the interaction between microalgae and LDPE and the influence of the addition of catalyst.It was found that co-pyrolysis could effectively inhibit the transformation of O and N to oil,and promote the O release as H_(2)O and N conversion to gas products.In addition,plastic adding significantly reduced the content of O-/N-compounds in oil,such as carboxylic acid,amide and N-heterocyclic,and increased the aliphatics content.Besides,it effectively promoted the formation of hydrocarbon gas,and showed a certain synergistic effect on CO and H_(2),and the interaction reached the maximum at 25%LDPE.Furthermore,ZSM-5 could promote the formation of hydrocarbon gas,increase the LHV of gas products(35.6 MJ/Nm^(3)),and further reduce the nitrogen compounds in the oil,while the N in microalgae transferred to gas,and O converted to gas and H_(2)O,which resulted in the further reduction of the O and N contents in the oil.Moreover,catalytic co-pyrolysis could inhibit the formation of aromatic hydrocarbons to a certain extent and improve the selectivity of aliphatic hydrocarbons.

关 键 词：混合热解/催化 微藻 LDPE 交互作用 脱氧除氮 

分 类 号：TK6[动力工程及工程热物理—生物能]