Syngas obtained from biomass gasification needs to fulfil strong purity requirements before being used as raw material in power energy generation or chemicals manufacturing. The use of hot catalytic filter candles inside the freeboard of fluidized bed gasifiers allows obtaining clean syngas without dust and low tar content. The tar removal efficiency of four different catalytic filter designs was evaluated with real biomass tar produced in situ in a dual fluidized bed gasifier (DFBG). The tar conversion reached at the outlet of the fluidized bed gasifier was larger for the candles with catalytically active layer design. If a monolith is also incorporated, the tar conversion increases up to 95% which is one of the highest values obtained up to date. In this case, the tar content at the outlet of the catalytic filter was as low as 0.2 g/Nm3 (N2 free, d.b.).
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机译：从生物质气化中获得的合成气必须满足很强的纯度要求，才能用作发电或化工生产的原料。在流化床气化炉干舷内使用热催化滤烛可以获得清洁的合成气，且无粉尘和低焦油含量。使用双流化床气化炉（DFBG）原位生产的实际生物质焦油评估了四种不同催化过滤器设计的焦油去除效率。对于具有催化活性层设计的蜡烛，在流化床气化炉出口处达到的焦油转化率更大。如果还加入整料，则焦油转化率提高至95％，这是迄今为止获得的最高值之一。在这种情况下，催化过滤器出口的焦油含量低至0.2 g / Nm3（不含N2，d.b。）。
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