摘要
结合浙江省长兴市某大米加工厂800kW稻壳气化发电系统测试结果，对MW级生物质气化发电站的运行特性进行了详细分析，重点考察了气化温度、当量比和负荷对生物质流化床气化特性的影响，并对系统存在的问题进行了讨论。气化炉轴向温度分布表明：床内存在流化不充分现象；密相区温度与当量比和负荷（加料速率）变化密切相关（负荷不变，床温随当量比增加近似线性升高；当量比相同，较高负荷对应较低的床温）。燃气热值随气化温度升高而降低，负荷变化对其影响不大。当气化温度保持在700～800℃之间时，燃气热值基本稳定在5453～6407kJ／Nm^3。原料水分对气化炉的运行也有重要影响：当原料水份低于15％，水分含量增加，有助于提高运行气化当量比，提高燃气品质和产气率；然而原料水分含量超过15％，气化炉温度将很难控制。
Based on the testing results of a 800 kW rice husk gasification and power generation plan in a rice factory in Changxing city, Zhejiang province, China, the operational performance of MW-scale biomass gasification and power generation plant was analyzed. The effects of bed temperature, equivalence ratio （ER） and load on the gasification characteristics of biomass in fluidized bed gasifier were investigated; the operational problems about the plant were also discussed. The results showed that the gasifier was not in well fluidized state, according to the axial temperature profile, and the temperature profile in dense phase of bed was correlative to change in ER and load. Bed temperature increased linearly with increasing ER when the load was fixed, while the lower temperature corresponded to higher load when ER was same; the low heating value of fuel gas （ QLHV ） was decreased with the rature increasing bed tempe, while the load had no effect on it. The low heating value of fuel gas ranged from 5453 to 6407 kJ/Nm^3 at the temperature of 700 - 800 ℃. The influence of water content in rice husk helped to improve the QLHV and yield of fuel gas when the water content was below 15%, however, the operation of gasifier became unstable when it exceeded 15%.
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2007年第4期389-393,共5页
Acta Energiae Solaris Sinica
基金
国家高技术研究发展计划(863)(2003AA514010)
广东省自然科学基金团队项目(003045)
广东省科技计划(2004A11007002)
关键词
生物质
气化发电
运行性能
biomass
gasification and power generation
operational performance
