基于热效率和㶲效率分析的循环流化床生物质气化规律研究

STUDY ON CIRCULATING FLUIDIED BED BIOMASS GASIFICATION LAW BASED ON ENERGY AND EXERGY ANALYSIS

基于热效率和㶲效率分析方法,研究循环流化床生物质气化过程中的主要参数(生物质种类、气化温度、水蒸气与碳的比值S/C和当量比ER)对气化系统㶲效率的影响。研究表明:在循环流化床生物质气化的诸多影响因素中,原材料的固定碳含量的变化对气化系统㶲效率影响最大:固定碳含量为8.99%的肉骨粉气化过程系统㶲效率最低为12.52%;固定碳含量为68.68%的晋城无烟煤气化过程系统㶲效率最高为59.95%,同时发现气化系统热效率与㶲效率的差值与所产气体的热值的关系。而其他增大气化参数(气化温度、S/C和ER)会提高㶲效率和热效率,但达到一定程度后将出现峰值,再升高温度将呈降低趋势。

Based on the energy and exergy analysis method,this paper studies the main parameters of the circulating fluidized bed biomass gasification process.The influence of biomass types,gasification temperature,ratio of steam to carbon(S/C)and equivalence ratio(ER)on the exergy efficiency of the gasification system.Studies have shown that among the many influencing factors of circulating fluidized bed biomass gasification,the change of biomass type has the greatest impact on the exergy efficiency of the gasification system.The MBM gasification process with FC of 8.99%has the lowest exergy efficiency at 12.52%.The Jincheng coal gasification process with FC of 68.68%has the highest exergy efficiency at 59.95%.At the same time,the relationship between the difference between the energy efficiency and the exergy efficiency of the gasification system and the calorific value of the gas produced is found.The increase of other gasification parameters,gasification temperature,S/C and ER will increase the exergy efficiency and energy efficiency,but after reaching a certain level,the peak will appear and the temperature will decrease.