Ambitious decarbonization pathways to limit the global temperature rise to well below 2 °C will require large-scale CO₂ removal from the atmosphere. One promising avenue for achieving this goal is hydrogen production from biomass with CO₂ capture. The present study investigates the techno-economic prospects of a novel biomass-to-hydrogen process configuration based on the gas switching integrated gasification (GSIG) concept. GSIG applies the gas switching combustion principle to indirectly combust off-gas fuel from the pressure swing adsorption unit in tubular reactors integrated into the gasifier to improve efficiency and CO₂ capture. In this study, these efficiency gains facilitated a 5% reduction in the levelized cost of hydrogen (LCOH) relative to conventional O₂-blown fluidized bed gasification with pre-combustion CO₂ capture, even though the larger and more complex gasifier cancelled out the capital cost savings from avoiding the air separation and CO₂ capture units. The economic assessment also demonstrated that advanced gas treatment using a tar cracker instead of a direct water wash can further reduce the LCOH by 12% and that the CO₂ prices in excess of 100 €/ton, consistent with ambitious decarbonization pathways, will make this negative-emission technology economically highly attractive. Based on these results, further research into the GSIG concept to facilitate more efficient utilization of limited biomass resources can be recommended.

将全球温度上升限制在远低于 2 °C 的雄心勃勃的脱碳途径将需要从大气中大规模去除 CO _{2 。实现这一目标的一个有希望的途径是利用CO 2}捕获从生物质制氢。本研究基于气体转换综合气化 (GSIG) 概念研究了新型生物质制氢工艺配置的技术经济前景。GSIG 应用气体切换燃烧原理间接燃烧来自集成到气化器的管式反应器中变压吸附单元的废气燃料，以提高效率和 CO ₂捕获。在本研究中，这些效率提升有助于将氢气 (LCOH) 的平准化成本 (LCOH) 降低 5%，相对于_{具有燃烧前 CO 2捕获}的传统吹氧流化床气化，即使更大、更复杂的气化器抵消了避免使用空气分离和 CO ₂捕集装置可节省资本成本。经济评估还表明，使用焦油裂解装置代替直接水洗进行高级气体处理可以进一步降低 12% 的 LCOH，并且 CO ₂超过 100 欧元/吨的价格与雄心勃勃的脱碳路径相一致，将使这种负排放技术在经济上极具吸引力。基于这些结果，可以建议对 GSIG 概念进行进一步研究，以促进更有效地利用有限的生物质资源。