Slow Pyrolysis as a Method for the Destruction of Japanese Wireweed, Sargassum muticum
Slow Pyrolysis as a Method for the Destruction of Japanese Wireweed, Sargassum muticum
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DOI：
10.5539/enrr.v5n1p28
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发表时间：
2015-01
期刊：
影响因子：
--
通讯作者：
J. Milledge;A. Staple;P. Harvey
中科院分区：
文献类型：
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作者：
J. Milledge;A. Staple;P. Harvey
日本的丝状藻（Sargassum muticum）是英国的一种入侵物种，可以通过收获它作为能源和化学品来控制。热解是在没有空气的情况下通过加热使干生物质的有机组分热分解。物质在固体、液体和合成气之间的分布取决于生物质以及热解温度和时间。在较低温度（~ 400 ℃）下缓慢热解往往会产生更多的固体炭。热解炭可以是一种有效的土壤改良剂，由于其稳定性或作为燃料燃烧的螯合剂。该研究试图回答这样一个问题：缓慢热解是否可以成为一种高效节能的方法，用于破坏日本金合欢并产生潜在的产品生物炭？开发了一个简单的试验装置，以建立从海藻的缓慢热解的生物炭，生物原油和合成气的产率。使用来自海藻原料分析的组成数据、来自弹式量热法的较高热值（HHV）和文献值计算能量平衡。将1公斤干海藻加热400摄氏度以缓慢热解所需的能量估计为0.5兆焦耳。由热解产生的合成气和生物原油的HHV总计为2.9MJ。因此，在通过海藻热解产生的生物原油和合成气馏分中存在足够的能量来为该过程提供动力并产生有用的生物炭，但不足以用于干燥的能量。
Japanese wireweed, Sargassum muticum is an invasive species to Great Britain, which might be controlled by harvesting it for energy and chemicals. Pyrolysis is the thermal decomposition of the organic components of dry biomass by heating in the absence of air. The distribution of matter between solid, liquid and syngas depends on the biomass and the pyrolysis temperature and time. Slow pyrolysis with lower temperatures (~ 400⁰ C) tends to produce more solid char. Pyrolysis char can be an effective soil ameliorant, a sequestration agent due to its stability or burned as a fuel. The research attempts to answer the question: Could slow pyrolysis be an energy efficient means for the destruction of Japanese wireweed and produce a potential product, biochar? A simple test rig was developed to establish the yield of biochar, biocrude and syngas from the slow pyrolysis of Sargassum muticum. An energy balance was calculated using compositional data from the analysis of the seaweed feedstock, higher heating values (HHV) from bomb-calorimetry and literature values. The energy required to heat 1 kg of dry seaweed by 400⁰ C for slow pyrolysis was estimated at 0.5 MJ. The HHV of syngas and biocrude produced from the pyrolysis totalled 2.9 MJ. There is, therefore, sufficient energy in the biocrude and syngas fractions produced by the pyrolysis of seaweed to power the process and produce useful biochar, but insufficient energy for drying.