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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。
In order to solve the difficult problem of biomass ash being easy to slag and high content of tar in the process of thermochemical conversion of biomass fuels, a scheme of reburning after biomass gasification at low temperature was put forward. In the design of biomass gasification reburning On the experimental stage, the temperature of the gasification chamber at 500 mm from the vibration grate was measured by high temperature thermocouple by changing the excess air coefficient (αag) and the ratio of atomized water to gasification air mass ratio S / A , And the temperature of the flame front in the furnace were measured. The volume percentage of gas in the gasification chamber at 1000mm above the vibration grate was analyzed offline by SP-3420A gas chromatograph under different working conditions. The experimental results show that the temperature in the gasifier rises with the increase of αag and the decrease of S / A, while the temperature of the flame front formed by the combustion of raw syngas decreases with the increase of αag and S / A. 0.35 and S / A = 0.10, the volume percentage of H2 in the gasifier is the largest; the volume percentage of CO increases with the increase of αag, but the trend of increasing decreases gradually; the volume of CH4 The content of αag increased with increasing, with increasing S / A slowly increasing trend. The test and analysis results provide the basis for the design and operation of biomass gasification and reburning boiler.