解耦双回路气化系统中生物质催化水蒸气气化制富氢气体

为强化生物质气化过程中焦油转化和氢气富集,提出了一种新型解耦双回路气化系统(DDLG) 。该气化系统将气化过程解耦为燃料气化、焦油重整和半焦燃烧三个子过程,分别发生于三个独立的反应器,即气化反应器、重整反应器和燃烧反应器。其中,气化反应器和重整反应器并行布置,分别与燃烧反应器相连,形成两个平行的且可独立控制的双循环回路。以松木屑为原料及兼作为原位焦油重整催化剂的煅烧橄榄石为循环固体热载体,考察了反应条件对 DDLG 中松木屑气化性能的影响。结果表明,重整反应器从气化反应器中解耦,并辅以橄榄石催化剂,可实现焦油高效转化脱除。如气化反应器700℃、重整反应器 850℃和水蒸气与原料中碳的质量比(S/C) 1.2 反应条件下,产品气中焦油含量降低至13.9g /m~3,气体产率和H_2分别达到1.0m~3 /kg,和38.8%。

Hydrogen-rich gas production from catalytic steam gasification of biomass in a decoupled dual loop gasification system

In order to strengthen tar destruction and hydrogen-rich gas production in the biomass gasification, a novel decoupled dual loop gasification (DDLG) system was proposed. The system decouples gasification process into fuel gasification, tar reforming and residual char combustion, which occur in three independent reactors, i.e. gasifier, reformer and combustor. Both the gasifier and the reformer are separately interconnected with the combustor, forming two circulation loops in parallel. With pine sawdust as feedstock, and calcined olivine as both solid heat carriers and in-situ tar destruction catalyst, the performance of biomass gasification was investigated. The results indicate that the reforming after the gasifier and the presence of olivine catalyst greatly improve the tar destruction. Specifically, at the gasifier temperature of 700 ℃, the reformer temperature of 850 ℃ and the steam to carbon mass ratio (S/C) of 1.2, the tar content in product gas decreases to 13.9 g/m³, and the dry gas yield and H₂ concentration reach 1.0 m³/kg, and 38.8%, respectively.