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  燃烧性能  黑液

Key Words:Organic Pretreatment  Catalytic Electrolysis  Energy Saving and Efficiency Improvement  Fuel Properties  Black Liquor

摘要:针对传统碱回收系统中黑液作为劣质燃料，需要浓缩、助燃等过程辅助，存在能耗高、热效率低及硫氧化物排放等问题，本工作对硫酸盐法制浆得到的稀黑液进行研究，基于有机预处理与催化电解技术分离黑液中有机小分子组分和木质素、回收碱，进而将将木质素解聚成烃类燃料，以实现黑液的燃料性能提升。结果表明，本工作所获得的黑液提质后燃料热值达35.14MJ/Kg，相比原黑液提升了133.02%。最大燃烧速率温度为123.52℃，最大燃烧速率为10.82 %/min，以及燃烧特性指数高于原黑液及其他生物质油，说明其可燃性能高；低表观活化能（23.36 kJ/mol）和高指前因子（2.68*106 min-1）表明黑液提质后燃料更易着火燃烧。本研究有助于黑液利用的节能增效，帮助企业降低生产成本，并为生产和利用可再生能源提供技术参考。

Abstract:As the inferior fuel, black liquor needs the process assistance of concentration and combustion-supporting in the traditional alkali recovery system, which has the problems of high energy consumption, low thermal efficiency and sulfur oxide emission. In this work, the weak black liquor of kraft pulping was studied. Organic small molecule components and lignin were separated from black liquor, alkali was recovered based on organic pretreatment and catalytic electrolysis in this study. Then, lignin was depolymerized into hydrocarbon fuel to improve the fuel properties of black liquor. The results showed that the calorific value of black liquor upgraded fuel was 35.14MJ/kg, which was increased by 133.02% by comparing with that of the original black liquor. The temperature corresponding to the maximum combustion rate was 123.52℃, the maximum combustion rate was 10.82 %/min. The combustion characteristic index was much higher than that of black liquor and other biomass oils, indicating that the black liquor upgraded fuel has high flammability. Moreover, low apparent activation energy (23.36 kJ/mol) and high pre-exponential factor (2.68*106 min-1) indicated that the black liquor upgraded fuel is more easily to ignite and burn. This study contributes to the energy-saving and efficiency improvement of black liquor utilization, helps enterprises reduce production costs, and provides technical references for the production and utilization of renewable energy.