双循环反应系统中麦饭石催化提质生物质热解挥发分

Catalytic upgrading of biomass pyrolysis volatile over medical stone in a dual loop reaction system

以麦饭石作为催化提质床料,在双循环反应系统中进行了生物质快速热解挥发分的催化提质实验,考察了麦饭石提质床料、催化提质温度和提质循环速率对生物质快速热解产物的影响。和石英砂相比,麦饭石催化提质降低了焦油产率,但提高了焦油中轻质焦油的相对含量。同时,麦饭石促使生物油中的氧元素以H2O、CO和CO2的形式脱除,且主要以H2O和CO的形式脱除,使焦油中烃类、酚类含量显著增大,酸类、酮类物质含量显著降低。催化提质温度升高更有利于焦油中的氧以H2O和CO形式脱除,焦油中烃类相对含量随提质温度升高而增加,而酸、酯、酮类含量降低。提高催化提质循环速率,焦油中轻质组分相对含量增加,但焦油中烃类、酚类相对含量均降低。在提质温度520℃,提质循环速率5.5kg/h时,提质油品质较好,轻质焦油含量较高,酚类物质相对含量可达到46.37%。

The catalytic upgrading experiment of biomass pyrolysis volatile over medical stone was carried out in a dual loop reaction system. The effects of upgrading bed material, catalytic upgrading temperature and circulating rate of medical stone were investigated. The results showed that upgrading by medical stone decreased the tar yield while increased the content of light tar compared to quartz sand.Medical stone promoted the removal of oxygen in bio-oil in the form of H2O, CO and CO2, especially in the form of H2O and CO. After catalytic upgrading by medical stone, the content of hydrocarbons and phenols in the tar increased significantly, while the content of acids and ketones decreased. Increasing catalytic upgrading temperature was more favorable to remove oxygen of tar in the form of H2O and CO. And the content of hydrocarbons in the tar increased while the content of acids, esters and ketones decreased with increasing catalytic upgrading temperature. When increasing the circulating rate of medical stone bed material, the light tar content increased while the content of hydrocarbons and phenols in the tar decreased. At catalytic upgrading temperature of 520℃ and circulating rate of 5.5 kg/h, the tar quality was in a good state with high content of light tar and the content of phenols reached 46.37%.