Chemical composition and calorific value of elephant grass varieties and other feedstocks intended for direct combustion

IF 1.1 4区农林科学 Q3 AGRICULTURE, MULTIDISCIPLINARY

Grassland Science Pub Date : 2021-05-28 DOI:10.1111/grs.12311

Anderson Carlos Marafon, André Felipe Câmara Amaral, Juarez Campolina Machado, Jailton da Costa Carneiro, Adriana Neutzling Bierhals, Victor dos Santos Guimarães

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引用次数: 6

Abstract

Perennial grasses display several positive attributes as suitable energy crops for use as a solid fuel for direct combustion, such as high annual production of dry matter per unit area, perennity and high harvest flexibility. This study aimed to characterize the chemical composition and calorific value of 18 elephant grass (EG) varieties (Pennisetum purpureum Schum.) and 10 other potential bioenergy feedstocks intended for direct combustion. Samples were obtained from 6-month-old EG and sorghum and 3-year-old eucalyptus, Mimosa caesalpiniaefolia, and bamboo plants. Sugarcane bagasse and straw, rice husk, corn stover, coconut husk, and fiber samples were also evaluated. The elemental composition, lower heating value (LHV), and cellulose (CEL), hemicellulose (HCEL), lignin (LIG) and ash contents (% dry matter) were analyzed. The results indicated that the EG genotypes showed significant differences when compared with other evaluated biomasses, but showed no differences among themselves. The EG varieties showed a mean LHV (16.7 MJ/kg) superior to that of rice husk, sugarcane bagasse, and sorghum and similar to that of sugarcane straw, coconut fiber, and corn stover. The EG varieties showed a mean ash content (4.74%) inferior to that of rice husk, sugarcane bagasse, coconut fiber, and sorghum; a mean CEL content (36.0%) similar to that of sugarcane straw, coconut fiber, corn stover, sorghum, and Mimosa caesalpinifolia; HCEL; a mean HCEL content (30.3%) superior to that of rice husk, bamboo, eucalyptus, M. caesalpinifolia, coconut husk, and fiber; and a mean LIG content (8.80%) superior to that of corn stover and similar to that of sorghum, sugarcane bagasse, and straw biomass. The significant capacity of EG to accumulate dry matter was associated with the biomass quality attributes (LHV and CEL, HCEL, LIG, and ash contents), thereby making it an excellent alternative to lignocellulosic feedstock for direct combustion.

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用于直接燃烧的象草品种和其他原料的化学成分和热值

多年生禾本科植物具有单位面积干物质年产量高、多年生和收获灵活性高等优点，适合作为固体燃料直接燃烧。本研究旨在表征18个象草品种(Pennisetum purpureum Schum.)和其他10种潜在的直接燃烧生物能源原料的化学成分和热值。样品取自6月龄的EG、高粱和3月龄的桉树、含羞草和竹子。蔗渣和秸秆、稻壳、玉米秸秆、椰子壳和纤维样品也进行了评价。分析了其元素组成、低热值(LHV)、纤维素(CEL)、半纤维素(HCEL)、木质素(LIG)和灰分(%干物质)含量。结果表明，与其他被评价生物量相比，EG基因型差异显著，但彼此间差异不显著。EG品种的平均LHV (16.7 MJ/kg)高于稻壳、甘蔗渣和高粱，与甘蔗秸秆、椰子纤维和玉米秸秆相似。EG品种的平均灰分含量(4.74%)低于稻壳、甘蔗渣、椰子纤维和高粱;平均CEL含量为36.0%，与甘蔗秸秆、椰子纤维、玉米秸秆、高粱和含羞草相似;HCEL;平均HCEL含量(30.3%)优于稻壳、竹子、桉树、玉兰、椰子壳和纤维;平均LIG含量(8.80%)优于玉米秸秆，与高粱、甘蔗渣和秸秆生物质相似。EG积累干物质的显著能力与生物质质量属性(LHV和CEL、HCEL、LIG和灰分含量)有关，从而使其成为直接燃烧的木质纤维素原料的优良替代品。

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来源期刊

Grassland Science Agricultural and Biological Sciences-Agronomy and Crop Science

CiteScore

2.70

自引率

7.70%

发文量

审稿时长

>12 weeks

期刊介绍： Grassland Science is the official English language journal of the Japanese Society of Grassland Science. It publishes original research papers, review articles and short reports in all aspects of grassland science, with an aim of presenting and sharing knowledge, ideas and philosophies on better management and use of grasslands, forage crops and turf plants for both agricultural and non-agricultural purposes across the world. Contributions from anyone, non-members as well as members, are welcome in any of the following fields: grassland environment, landscape, ecology and systems analysis; pasture and lawn establishment, management and cultivation; grassland utilization, animal management, behavior, nutrition and production; forage conservation, processing, storage, utilization and nutritive value; physiology, morphology, pathology and entomology of plants; breeding and genetics; physicochemical property of soil, soil animals and microorganisms and plant nutrition; economics in grassland systems.