In many industrial processes, the climate-damaging gas CO₂ is produced as undesired by-product. The dual fluidized bed biomass gasification technology offers the opportunity to tackle this problem by using the produced CO₂ within the process as gasification agent. Therefore, a 100 kW_th pilot plant at TU Wien was used to investigate the use of CO₂ as gasification agent by converting softwood as fuel and olivine as bed material into high-valuable product gas. A parameter variation was conducted, where the typically used gasification agent steam was substituted stepwise by CO₂. Thereby, the amount of CO and CO₂ increased and the content of H₂ decreased in the product gas. These trends resulted in a declining H₂/CO ratio and a decreasing lower heating value when CO₂ was increased as gasification agent. In contrast to these declining trends, the carbon utilization efficiency showed an increasing course. As second part of this work, a temperature variation from 740 to 840 °C was conducted to investigate the change of the main product gas components. With increasing temperature, CO and H₂ increased and CO₂ decreased. To determine the degree of conversion of CO₂ in the DFB reactor system, two approaches were selected: (1) a carbon balance and (2) a hydrogen balance. This way, it was found out that a certain amount of CO₂ was indeed converted at the investigated process conditions. Furthermore, under certain assumptions, the reverse water-gas shift reaction was identified to be the predominant reaction during CO₂ gasification.

在许多工业过程中，产生有害气候的气体CO ₂是不希望的副产物。双流化床生物质气化技术提供了通过使用过程中产生的CO ₂作为气化剂来解决此问题的机会。因此，一个100千瓦_日在TU Wien的中试设备来调查使用CO的₂通过转换软木作为燃料和橄榄石作为床料转化为高价值的产品气体作为气化剂。进行参数变化，其中通常使用的气化剂蒸汽逐步被CO ₂代替。由此，CO和CO _2的量增加，并且H ₂的含量产物气减少。当增加作为气化剂的CO ₂时，这些趋势导致H ₂ / CO比下降和较低的较低发热量降低。与这些下降趋势相反，碳利用效率显示出上升的趋势。作为这项工作的第二部分，进行了从740到840°C的温度变化研究主要产品气体成分的变化。随着温度升高，CO和H ₂升高，CO ₂降低。为了确定DFB反应器系统中CO ₂的转化程度，选择了两种方法：（1）碳平衡和（2）氢平衡。通过这种方式，发现一定量的CO ₂确实在研究的工艺条件下进行了转化。此外，在某些假设下，反向水煤气变换反应被认为是CO ₂气化过程中的主要反应。