Emissions From Oxy-Combustion of Raw and Torrefied Biomass
Emissions From Oxy-Combustion of Raw and Torrefied Biomass
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DOI：
10.1115/1.4047330
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发表时间：
2020-06
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影响因子：
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通讯作者：
Xiaoxiao Meng;Emad Rokni;Wei Zhou;Hongliang Qi;R. Sun;Y. Levendis
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作者：
Xiaoxiao Meng;Emad Rokni;Wei Zhou;Hongliang Qi;R. Sun;Y. Levendis
这项工作评估了在传统（空气）和模拟富氧燃烧（氧气/二氧化碳）环境中原始和烘焙生物质（含可溶物和稻壳的干酒糟）燃烧产生的酸性气体的演变。重点放在后者，因为可再生或废弃生物质的富氧燃烧，加上碳捕获和利用或封存，可能有利于缓解全球变暖。富氧燃烧环境设置为 21%O2/79%CO2 和 30%O2/70%CO2。结果显示，无论是生物质还是烘焙生物质的燃烧，在 21%O2/79%CO2 条件下产生的 CO2 排放量低于 30%O2/70%CO2 条件下的 CO2 排放量，而 CO 排放量则呈现相反的趋势。空气中燃烧的CO排放量明显低于两种富氧燃烧环境，其中21%O2/79%CO2环境中的CO排放量最高。 NO排放量与CO2变化趋势相同，HCN排放量与CO变化趋势相同，其中NO排放量高于HCN排放量。富氧燃烧的 SO2 排放量低于空气燃烧。此外，与原始生物质的燃烧相比，烘焙生物质的燃烧产生更高的CO2和NO，相当的CO和SO2，以及更低的HCN排放。在本研究测试的三种条件中，当气体成分为 30%O2/70%CO2 时，生物质的富氧燃烧，无论是原始状态还是烘焙状态，都达到最高的燃烧效率，并导致 CO、HCN 和 SO2 排放量最低。
This work assesses the evolution of acid gases from raw and torrefied biomass (distiller’s dried grains with solubles and rice husk) combustion in conventional (air) and simulated oxy-combustion (oxygen/carbon dioxide) environments. Emphasis was placed on the latter, as oxy-combustion of renewable or waste biomass, coupled with carbon capture and utilization or sequestration, could be a benefit toward mitigating global warming. The oxy-combustion environments were set to 21%O2/79%CO2 and 30%O2/70%CO2. Results revealed that combustion of either raw or torrefied biomass generated CO2 emissions that were lower in 21%O2/79%CO2 than at 30%O2/70%CO2, whereas CO emissions exhibited the opposite trend. Emissions of CO from combustion in air were drastically lower than those in the two oxy-combustion environments and those in 21%O2/79%CO2 were the highest. Emissions of NO followed the same trend as those of CO2, while HCN emissions followed the same trend as those of CO. Emissions of NO were higher than those of HCN. The emissions of SO2 were lower in oxy-combustion than in air combustion. Moreover, combustion of torrefied biomass generated higher CO2 and NO, comparable CO and SO2, and lower HCN emissions than combustion of raw biomass. Out of the three conditions tested in this study, oxy-combustion of biomass, either in the raw and torrefied state, attained the highest combustion effectiveness and caused the lowest CO, HCN, and SO2 emissions when the gas composition was 30%O2/70%CO2.