关键词: 木质建筑模板, 生物质, 固定床, 热解, 三相产物

Abstract:

The pyrolysis experiment of waste wood building formwork was carried out in a horizontal fixed bed reactor to explore the influence of pyrolysis temperature (400—800℃) on the pyrolysis products of waste wood building formwork. In addition, two typical biomass, wood chips and rice husks, were selected to compare and analyze the distribution and properties of the pyrolysis products of the three raw materials. The results show that with the increase of pyrolysis temperature, the solid phase yield of waste wood building formwork and two typical biomass shows a decreasing trend, while the gas phase yield shows an increasing trend, and the liquid phase product yield reaches a peak at 500℃ and then gradually decreases. The content of functional groups on the surface of biochar decreases continuously, and the pore structure of biochar tends to be abundant except rice husk. The oxygen-containing heavy organic molecules in the pyrolysis oil are gradually transformed into light aromatic and hydrocarbon molecules. The proportion of combustible components in pyrolysis gas increases. The solid phase yield of wooden building formwork is the highest at 400℃, reaching 40.16%. The pyrolysis liquid phase yield is the highest at 500℃, reaching 53.6%. With further increase in temperature, the gas phase yield reaches 43.3% at 800℃. At the same pyrolysis temperature, the liquid phase yield of wood building formwork is the highest, and the proportion of oxygen and aromatic organic compounds in pyrolysis oil is relatively high. The proportion of combustible components in pyrolysis gas at low temperature is higher than that of wood chips and rice husks. This study provides a useful reference for the resource utilization of waste wood building formwork.

Key words: wood building formwork, biomass, fixed bed, pyrolysis, three-phase product