Performance of entrained flow and fluidised bed biomass gasifiers on different scales
Performance of entrained flow and fluidised bed biomass gasifiers on different scales
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DOI：
10.1016/j.enconman.2013.02.001
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发表时间：
2013-05
影响因子：
10.4
通讯作者：
A. Tremel;Dominik Becherer;S. Fendt;M. Gaderer;H. Spliethoff
中科院分区：
文献类型：
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作者：
A. Tremel;Dominik Becherer;S. Fendt;M. Gaderer;H. Spliethoff
本生物质气化工艺研究比较了10兆瓦至500兆瓦的双流化床和吹氧气流床气化炉的能量效率和经济效益。虽然流态化气化技术已成为中小型生物质气化设施中应用最多的技术，但气流床气化技术仍仅用于工业规模的煤气化。因此，分析了夹带流动技术是否是生物质热化学转化的一种节能和经济有效的选择。特别关注生物质的预调节方法，使其能够在气流床气化炉中应用。为两种类型的气化炉选择了工艺链，并随后将其转换为模拟模型。模拟结果表明，对于生产加压成品气(2.5 Mpa)，两种气化炉的性能相似。沸腾床的冷气效率为76-79%，比气流床高0.5-2个百分点。这两种技术的净效率相似，根据规模的不同，在和71%之间。气流床的辅助功率消耗主要由空分装置、氧气压缩和燃料粉碎引起，而流态化床需要额外的功率主要用于气体压缩。在这两项技术的经济分析中，产品天然气的成本被确定在4.2美分/千瓦时(500兆瓦)到7.4美分/千瓦时(10兆瓦)之间。研究表明，气流床反应器也是具有竞争力的生物质气化技术，规模也较小。
This biomass gasification process study compares the energetic and economic efficiencies of a dual fluidised bed and an oxygen-blown entrained flow gasifier from 10MWthto 500MWth. While fluidised bed gasification became the most applied technology for biomass in small and medium scale facilities, entrained flow gasification technology is still used exclusively for industrial scale coal gasification. Therefore, it is analysed whether and for which capacity the entrained flow technology is an energetically and economically efficient option for the thermo-chemical conversion of biomass. Special attention is given to the pre-conditioning methods for biomass to enable the application in an entrained flow gasifier. Process chains are selected for the two gasifier types and subsequently transformed to simulation models. The simulation results show that the performance of both gasifier types is similar for the production of a pressurised product gas (2.5MPa). The cold gas efficiency of the fluidised bed is 76–79% and about 0.5–2 percentage points higher than for the entrained flow reactor. The net efficiencies of both technologies are similar and between 64% and 71% depending on scale. The auxiliary power consumption of the entrained flow reactor is caused mainly by the air separation unit, the oxygen compression, and the fuel pulverisation, whereas the fluidised bed requires additional power mainly for gas compression. The costs for the product gas are determined as between €4.2cent/kWh (500MWth) and €7.4cent/kWh (10MWth) in the economic analysis of both technologies. The study indicates that the entrained flow reactor is competitive technology for biomass gasification also on a smaller scale.