Abstract
This paper aims to reveal the temporal and spatial variation of temperature and product gas components inside the updraft biomass gasifier, and the relationship between it and the chemical reaction was also analyzed. Using wood processing residues, the gasification characteristics of the gasifier were studied in depth. The results indicated that the gas products could be ignited after the gasifier startup 4 min and the time of normal operation condition was 81 min. The optimum air flow rate of the gasifier was ∼1.9 m3/h, with a LHV of product gas of 4.38 MJ/Nm3, temperature of the oxidation zone of 960 °C, and gasification intensity of 57.8 kg/(m2·h). Along with the height direction, the layered characteristic of reaction type was very obvious, and the height of the oxidation zone, reduction zone, pyrolysis zone, and desiccation zone could be calculated approximately as 130 mm, 95 mm, 195 mm, and the rest of the material height, respectively.
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