【摘要】 为解决生物质燃料热化学转化过程中,生物质灰易结渣和气化气含量焦油高的2个难题,提出生物质低温气化后再燃的实验方案,并在自行设计的生物质气化再燃实验台上,通过改变稻壳气化介质的过量空气系数(αag)和雾化水与气化空气质量比S/A,利用高温热电偶测量了距震动炉排500 mm处气化室的温度,以及炉膛内火焰锋面温度;并利用SP-3420A气相色谱仪离线分析了不同工况下,震动炉排上方1000mm处气化室的气体的体积百分含量。实验结果表明:随着αag的增大和S/A的降低,气化炉内的温度升高;而粗合成气燃烧形成的火焰锋面温度随αag和S/A的增大而降低;在αag=0.35,S/A=0.10时,气化炉内H2的体积百分含量最大;CO的体积百分含量随着αag的增大而增大,但增大的趋势逐渐减小;CH4的体积百分含量随着αag的增大而增小,随S/A的增大有缓慢增大趋势。该文试验和分析结果为生物质气化再燃锅炉的设计和运行提供了依据。更多还原

【Abstract】 To solve the slagging and tar in biomass thermochemical utilization,the method of the crude syngas combustion after low-temperature gasification was proposed.Experiments of combustion after gasification to rice husk were taken by changing equivalence ratio of agent(aag) and the ratio of steam to air(S/A) on the self-designed experiment bench.Temperatures of the point which was 500 mm over the vibration grate in the gasifier and the flame front in furnace were measured by thermocouples respectively;the volume percentage of syngas was also measured under different conditions by an off-line gas chromatograph(SP-3420A) which was set at 1000 mm over the vibration grate.The results of the experiments show: The gasification temperature increases when increases and S/A declines,while the temperature of the flame front decreases with and S/A increases.The volume percentage of H2 reaches maximum value whenaag is 0.35 and S/A is 0.10.The volume percentage of CO increases as aag increases,while the increasing trend gradually decreases.The volume percentage of CH4 decreases when ER-ag increases and S/A decreases,respectively.The results of this paper provide basis and reference for the design and running of combustion after gasification system to biomass.更多还原