Youjian Zhu , Diyu Liu , Zhiwu Tan , Huihui Liu , Tao Kan , Wennan Zhang , Hui Li , Yu Li , Wei Yang , Haiping Yang
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Meanwhile, the aromaticity of the char increased with increasing the wood blend ratio, resulting in an enhanced quality of the char. The volatile-char interactions could facilitate the cracking of large molecules in volatiles into small-molecule gases, leading to an increase in the gas yield of 0.6–14.6 %, and especially the H<sub>2</sub> yield of 16.2–53.8 %, as compared to the case without interaction in the experiment. The char yields hold fairly constant but the physicochemical structure of the char changed significantly with the interactions. Specifically, the O-containing functional groups on the char surface decreased significantly with increasing aromaticity and stability. More importantly, the total phosphorus content of char was increased by 11.3–33.6 %, as compared to the case without interaction, with the enhanced conversion of non-hydroxyapatite phosphorus to hydroxyapatite phosphorus. 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引用次数: 0
摘要
热解是一种对污水污泥进行无害化和资源化利用的热化学转化方法,可获得高附加值的含碳产品,并有利于减少温室气体,实现 "碳峰值和碳中和 "目标。这项工作研究了污水污泥和杨木的协同热解,探讨了木材混合比例和挥发物与碳的相互作用对热解产物特性的影响。研究发现,协同热解过程中的协同效应可提高芳香烃的产量,但会抑制含氮化合物和酚类化合物的形成。同时,木炭的芳香度随着木材混合比例的增加而增加,从而提高了木炭的质量。挥发物与木炭的相互作用可促进挥发物中的大分子裂解为小分子气体,与实验中无相互作用的情况相比,气体产率增加了 0.6-14.6%,特别是 H2 产率增加了 16.2-53.8%。炭产量基本保持不变,但炭的物理化学结构却随着相互作用发生了显著变化。具体来说,随着芳香度和稳定性的增加,炭表面的含 O 功能基团明显减少。更重要的是,随着非羟基磷灰石磷向羟基磷灰石磷的转化增强,与无相互作用的情况相比,炭的总磷含量增加了 11.3-33.6%。相互作用可提高磷的生物利用率,使生物炭成为更好的有机肥料。
Volatile-char interactions during co-pyrolysis of sewage sludge and poplar wood
Pyrolysis is a thermo-chemical conversion method for harmless and resource utilization of sewage sludge, which gives carbon-containing products with high added value and benefits for GHG reduction towards “carbon peaking and carbon neutrality” goals. In this work, co-pyrolysis of sewage sludge and poplar wood was studied to investigate the effects of the wood blend ratio and the volatile-char interactions on the pyrolysis product characteristics. It was found that the synergistic effect during co-pyrolysis could enhance the production of aromatic hydrocarbons but inhibit the formation of nitrogen-containing and phenolic compounds. Meanwhile, the aromaticity of the char increased with increasing the wood blend ratio, resulting in an enhanced quality of the char. The volatile-char interactions could facilitate the cracking of large molecules in volatiles into small-molecule gases, leading to an increase in the gas yield of 0.6–14.6 %, and especially the H2 yield of 16.2–53.8 %, as compared to the case without interaction in the experiment. The char yields hold fairly constant but the physicochemical structure of the char changed significantly with the interactions. Specifically, the O-containing functional groups on the char surface decreased significantly with increasing aromaticity and stability. More importantly, the total phosphorus content of char was increased by 11.3–33.6 %, as compared to the case without interaction, with the enhanced conversion of non-hydroxyapatite phosphorus to hydroxyapatite phosphorus. The interaction can increase bio-availability of the phosphorus and make biochar to be a better organic fertilizer in application.
期刊介绍:
The Journal of the Energy Institute provides peer reviewed coverage of original high quality research on energy, engineering and technology.The coverage is broad and the main areas of interest include:
Combustion engineering and associated technologies; process heating; power generation; engines and propulsion; emissions and environmental pollution control; clean coal technologies; carbon abatement technologies
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Alternative energy sources; biomass utilisation and biomass conversion technologies; energy from waste, incineration and recycling
Energy conversion, energy recovery and energy efficiency; space heating, fuel cells, heat pumps and cooling systems
Energy storage
The journal''s coverage reflects changes in energy technology that result from the transition to more efficient energy production and end use together with reduced carbon emission.