Catalytic steam gasification of food waste with food waste ash supported Nickel catalyst: conventional vs in-situ two-stage approach.

IF 2 4区 环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES
Aayush Raizada, Sanjeev Yadav
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Abstract

In this study, first, a novel Ni catalyst was developed where 5% nickel was loaded on food waste ash and thereafter, it was used in steam gasification of food waste via two different processes: conventional overlapping process (COP) with simultaneous pyrolysis and gasification, and in-situ two-stage process (ITP) with consecutive pyrolysis and gasification. The temperature for the pyrolysis and gasification stage in ITP was maintained at around 850 °C. Both the processes (COP and ITP) were also conducted at the same temperature of 850°C with a steam flow rate of 0.73 mL/min for 100 g of the food waste sample. The processes were conducted in a downdraft gasifier with variations in catalyst content. The catalyst content in the feed-catalyst mixture was varied from 0 to 50 g, and results indicated that the use of a 50 g catalyst during COP increased the syngas yield quite significantly (∼70%). However, the results showed that the Ni catalyst did not have much effect on syngas yield from ITP, though it increased the hydrogen fraction in syngas (∼80%). The highest hydrogen fraction in syngas from COP and ITP was found to be 71.74% and 66.53% respectively. Consequently, the highest hydrogen yield of 1.3 m3/kg was obtained from COP for 50 g of catalyst in a feed-catalyst mixture. Furthermore, performance parameters such as high heating value (HHV), carbon conversion efficiency (CCE), and cold gas efficiency (CGE) were determined for performance analysis of the Ni-based catalyst in conventional and in-situ steam gasification.

食物垃圾灰负载镍催化剂催化蒸汽气化:常规与原位两阶段方法。
本研究首先研制了一种新型镍催化剂,在食物垃圾灰分上负载5%的镍,然后通过常规重叠法(COP)同时热解气化和原位两段法(ITP)连续热解气化两种不同的工艺对食物垃圾进行蒸汽气化。ITP热解和气化阶段的温度保持在850℃左右。两种工艺(COP和ITP)也在850℃的相同温度下进行,蒸汽流速为0.73 mL/min, 100 g食物垃圾样品。这些过程是在一个下吸式气化炉中进行的,催化剂含量不同。进料-催化剂混合物中的催化剂含量从0到50 g不等,结果表明,在COP过程中使用50 g催化剂可显著提高合成气收率(约70%)。然而,结果表明,镍催化剂对ITP合成气收率没有太大影响,尽管它提高了合成气中的氢含量(约80%)。COP和ITP的合成气氢组分最高,分别为71.74%和66.53%。因此,在进料-催化剂混合物中,当催化剂用量为50 g时,COP的产氢率最高,为1.3 m3/kg。通过测定高热值(HHV)、碳转化效率(CCE)和冷气效率(CGE)等性能参数,对镍基催化剂在常规和原位蒸汽气化中的性能进行了分析。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Environmental Technology
Environmental Technology 环境科学-环境科学
CiteScore
6.50
自引率
3.60%
发文量
0
审稿时长
4 months
期刊介绍: Environmental Technology is a leading journal for the rapid publication of science and technology papers on a wide range of topics in applied environmental studies, from environmental engineering to environmental biotechnology, the circular economy, municipal and industrial wastewater management, drinking-water treatment, air- and water-pollution control, solid-waste management, industrial hygiene and associated technologies. Environmental Technology is intended to provide rapid publication of new developments in environmental technology. The journal has an international readership with a broad scientific base. Contributions will be accepted from scientists and engineers in industry, government and universities. Accepted manuscripts are generally published within four months. Please note that Environmental Technology does not publish any review papers unless for a specified special issue which is decided by the Editor. Please do submit your review papers to our sister journal Environmental Technology Reviews at http://www.tandfonline.com/toc/tetr20/current
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