Journal article Open Access

CO2 gasification in a dual fluidized bed reactor system: Impact on the product gas composition

Anna Magdalena Mauerhofer; Josef Fuchs; Stefan Müller; Florian Benedikt; Johannes Christian Schmid; Hermann Hofbauer


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    <subfield code="a">&lt;p&gt;The use of CO&lt;sub&gt;2&lt;/sub&gt; as gasification agent in the 100 kW&lt;sub&gt;th&lt;/sub&gt; dual fluidized bed gasification pilot plant was investigated at TU Wien. For this purpose, steam as gasification agent was replaced stepwise by CO&lt;sub&gt;2&lt;/sub&gt;. Softwood was used as fuel and olivine as bed material. Starting from 100 vol.-% steam as gasification agent, substituting it by 32, 45 and finally 68 vol.-% CO&lt;sub&gt;2&lt;/sub&gt;. All loop seals were fluidized further with steam, which resulted in these volume percentages. Additionally, a CO&lt;sub&gt;2&lt;/sub&gt; gasification test campaign converting softwood with a mixture (90/10 wt.-%) of olivine and limestone was investigated. For this case, the gasification agent was composed of 65 vol.-% CO&lt;sub&gt;2&lt;/sub&gt; and 35 vol.-% steam. The use of CO&lt;sub&gt;2&lt;/sub&gt; as gasification agent led to changes of the product gas. Instead of a H&lt;sub&gt;2&lt;/sub&gt;-enriched product gas, which was produced during steam gasification, CO and CO&lt;sub&gt;2&lt;/sub&gt; occupied the major share of the product gas. Consequently, the H&lt;sub&gt;2&lt;/sub&gt;/CO ratios as well as the lower heating values decreased when substituting steam by CO&lt;sub&gt;2&lt;/sub&gt;. Tar contents were lower for CO&lt;sub&gt;2&lt;/sub&gt;/steam gasification compared to pure steam gasification.&lt;/p&gt;</subfield>
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