有机预处理协同催化电解提升黑液燃料性能的研究

Research on Improving the Fuel Properties of Black Liquor by Organic Pretreatment Combined with Catalytic Electrolysis

关键词:  有机预处理  催化电解  节能增效  燃料性能  黑液

Key Words:organic pretreatment  catalytic electrolysis  energy saving and efficiency improvement  fuel properties  black liquor

摘要:本研究以硫酸盐法制浆稀黑液（BL）为原料，基于有机预处理与催化电解技术，分离黑液中小分子有机组分和木质素、回收碱，进而将木质素解聚成烃类燃料，以实现黑液燃料性能的提升。结果表明，有机预处理与催化电解的组合技术最高可回收约98%的碱和89.1%的总木质素，且经电化学还原处理后，木质素液化率可达95.0%。黑液提质后，燃料（BLUF-3）的热值达35.1 MJ/kg，相比BL提升了132%，且具有低表观活化能（23.4 kJ/mol）和高指前因子（2.68×10⁶ min^-1），更易着火燃烧。在温度为123.52 ℃时，BLUF具有最大燃烧速率，为10.8%/min，其燃烧特性指数高于BL及其他生物质油，可燃性能高。

Abstract:In this study， the weak black liquor （BL） obtained from sulfate pulping was taken as raw material， based on the organic pretreatment and catalytic electrolysis techniques， the organic small molecule components and lignin in the BL， and recover alkali were separated. Then， lignin was depolymerized into hydrocarbon fuels in order to improve the fuel properties of the BL. The results showed that about 98% alkali and 89.1% total lignin could be recovered by the process of organic pretreatment combined with catalytic electrolysis technology， and the liquefaction rate of lignin after electrochemical reduction treatment could reach up to 95.0%. The calorific value of black liquor upgraded fuel （BLUF-3） reached 35.1 MJ/kg， which was increased by 132% compared with that of the BL， and it had low apparent activation energy （23.4 kJ/mol） and high pre-exponential factor （2.68×10⁶ min^-1） which made it easier to ignite and burn. When the temperature was 123.52 ℃， BLUF had the maximum combustion rate of 10.8%/min， and its combustion characteristic index was higher than that of BL and other biomass oils， with high flammability.