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利用上吸式固定床反应器,对烟秆进行了水蒸气气化实验,在617~1 435℃的温度范围内研究了温度及水蒸气流量对气化特性的影响。结果表明,当气化温度低于917℃时,升高温度可同时促进均相和非均相产氢反应的进行,产氢率随着温度升高而迅速上升。当温度上升到917℃时,非均相反应已进行得足够充分,潜在产氢率达到最大值,碳转换率超过0.8。当温度超过917℃后,温度升高对产氢的影响主要体现为促进均相反应进行,产氢率上升变缓。温度达到1 327℃时,均相反应速率足以使气体在反应器内反应完全,因而升高温度不再有助于提高产氢率,产氢率最大值为0.97m~3/kg。水蒸气流量增加能够促进气化产氢反应与水蒸气扩散,同时会缩短气体停留时间、降低局部温度,因此,随着水蒸气流量增加,产氢率先升高后降低,在917℃时烟秆气化的最佳水蒸气流量为15.7 g/min。结果可以为生物质高温气化制氢的研究提供参考。
The experiment of steam gasification of tobacco straw was carried out by using a fixed-bed adsorption reactor. The effects of temperature and steam flow on the gasification characteristics were studied in the temperature range of 617-1 435 ℃. The results show that when the gasification temperature is lower than 917 ℃, the increase of temperature can promote both homogeneous and heterogeneous hydrogen production. The hydrogen production rate increases rapidly with the increase of temperature. When the temperature rises to 917 ° C, the heterogeneity reaction has proceeded sufficiently, the potential hydrogen production rate reaches its maximum, and the carbon conversion rate exceeds 0.8. When the temperature exceeds 917 ℃, the effect of temperature increase on hydrogen production is mainly reflected by the promotion of homogeneous reaction, and the hydrogen production rate increases slowly. When the temperature reaches 1 327 ℃, the homogeneous reaction rate is enough to make the gas react completely in the reactor. Therefore, raising the temperature no longer helps to increase the hydrogen production rate, and the maximum hydrogen production rate is 0.97 m 3 / kg. Therefore, with the increase of water vapor flow rate, the hydrogen production rate first increases and then decreases. At 917 ℃, the growth of tobacco stems The optimum vaporized gas flow rate is 15.7 g / min. The results can provide a reference for the research of hydrogen production by high temperature gasification of biomass.