NiO/CaO添加剂下生物质水蒸气气化特性

Influence of NiO/CaO Additive on Biomass Steam Gasification

使用自制NiO/CaO添加剂在TGA上进行了吸碳实验、在单床和双床系统上进行了生物质气化实验。添加剂吸碳/脱碳循环性能实验结果表明,在天然石灰石上添加氧化镍强化了单位氧化钙吸碳容量,添加质量分数2%氧化镍获得最高吸碳容量(0.47 g-CO_2/g-CaO),较天然石灰石有较大提升。经过14次循环后,添加剂都出现了程度不同的烧结,引起了吸收容量的下降。气化实验表明,双床系统更利于使用添加剂来强化生物质气化,获得高氢气产率和较低的二氧化碳量。添加质量分数2%氧化镍的样品获得最大氢气产率265 mL/g生物质,相比天然石灰石提高了14%,相比单床系统提高了33%,继续增加镍含量影响不大。

The effect of the NiO/CaO additive on biomass gasification was investigated with a single and double reactor gasification system,also its CO_2 capture ability was discussed by using TGA.Impregnate of NiO on calcinedlimestone enhanced the CO_2 capture capacity per unit of Calcium.With 2%NiO,it showed the highest capacity（0.47 g-CO_2/g-Lime）,which is much higher than natural calcined limestone.After 14 carbonation/calcination cycles,every additive got sintering but different degrees,which resulted in decrease of capacity.By using double reactor system,where the biomass and additive were separately placed in different reactor,it displayed higher activity in gasification.With additive,it got more amount of H_2 and less amount of CO_2.In the case of 2%NiO/Lime,it obtained the highest hydrogen yield of 265 mL/g biomass,which is 14%higher than the case of calcined limestone and 33%higher than that in the single reactor system,further increase the.NiO content didn＇t improve the yield.