Pyrolysis of wheat straw pellets in a pilot-scale reactor: Effect of temperature and residence time

IF 3.5 3区工程技术 Q3 ENERGY & FUELS

Energy Science & Engineering Pub Date : 2024-07-09 DOI:10.1002/ese3.1833

Bidhan Nath, Guangnan Chen, Les Bowtell, Thong Nguyen-Huy

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Abstract

Pyrolysis of two types of pellets (T₁: 100% wheat straw, and T₂: 70% wheat straw; 10% sawdust, 10% biochar, and 10% bentonite clay) was performed in a pilot-scale reactor under a nitrogen environment at 20°C to 700°C. This was to investigate slow pyrolysis yields and gas composition as a function of temperature and residence time. The experimental data were obtained between 300°C and 600°C, with a residence time of 90 min, a nitrogen flow rate of 50 cm³/min, and a heating rate of 20°C/min. The results indicated that the maximum pyrolysis temperature is 605°C with a residence time of 55 min. The product analysis showed that the proportion of gas was higher than that of biochar and bio-oil. The conversion efficiency increased with higher temperatures and varied between 66% and 76%. The results showed that carbon dioxide was the main component in the produced gas, and the maximum gas concentration was 63.6% at 300°C for T₁. The higher temperature and longer residence time increased the syngas (CO + H₂) composition for both T₁ and T₂ treatments. Nevertheless, the produced biochar had a high carbon content and retained a high calorific value, indicating slow pyrolysis is the ideal utilization route of wheat straw pellet biomass for biochar.

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在中试规模反应器中热解小麦秸秆颗粒：温度和停留时间的影响

在一个中试规模的反应器中，在 20°C 至 700°C 的氮气环境下对两种颗粒（T1：100% 小麦秸秆；T2：70% 小麦秸秆；10% 锯末、10% 生物炭和 10% 膨润土）进行了热解。目的是研究缓慢热解产率和气体成分与温度和停留时间的函数关系。实验数据是在 300°C 至 600°C 之间获得的，停留时间为 90 分钟，氮气流速为 50 立方厘米/分钟，加热速度为 20°C/分钟。结果表明，最高热解温度为 605°C，停留时间为 55 分钟。产品分析表明，气体的比例高于生物炭和生物油。转化效率随温度升高而提高，在 66% 至 76% 之间。结果表明，二氧化碳是生成气体的主要成分，T1 在 300°C 时的最大气体浓度为 63.6%。在 T1 和 T2 处理中，较高的温度和较长的停留时间增加了合成气（CO + H2）的成分。尽管如此，生产的生物炭含碳量高，热值也高，这表明缓慢热解是生物炭利用小麦秸秆颗粒生物质的理想途径。

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来源期刊

Energy Science & Engineering Engineering-Safety, Risk, Reliability and Quality

CiteScore

6.80

自引率

7.90%

发文量

298

审稿时长

11 weeks

期刊介绍： Energy Science & Engineering is a peer reviewed, open access journal dedicated to fundamental and applied research on energy and supply and use. Published as a co-operative venture of Wiley and SCI (Society of Chemical Industry), the journal offers authors a fast route to publication and the ability to share their research with the widest possible audience of scientists, professionals and other interested people across the globe. Securing an affordable and low carbon energy supply is a critical challenge of the 21st century and the solutions will require collaboration between scientists and engineers worldwide. This new journal aims to facilitate collaboration and spark innovation in energy research and development. Due to the importance of this topic to society and economic development the journal will give priority to quality research papers that are accessible to a broad readership and discuss sustainable, state-of-the art approaches to shaping the future of energy. This multidisciplinary journal will appeal to all researchers and professionals working in any area of energy in academia, industry or government, including scientists, engineers, consultants, policy-makers, government officials, economists and corporate organisations.