Physical and Combustion Properties of Binder-Assisted Hydrochar Pellets from Hydrothermal Carbonization of Tobacco Stem
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ORIGINAL PAPER
Physical and Combustion Properties of Binder‑Assisted Hydrochar Pellets from Hydrothermal Carbonization of Tobacco Stem Miao Liang1,2 · Wenjie Lu3 · Ping Lei4 · Le Wang1 · Bing Wang1 · Bin Li1 · Yi Shen3 · Ke Zhang1 Received: 6 May 2019 / Accepted: 16 October 2019 © Springer Nature B.V. 2019
Abstract Hydrothermal carbonization (HTC) combined with pelletization is an efficient upgrading process to convert biomass into energy-dense pellets. Binders usually serve an important role in the quality of biofuel pellets. Here, hydrochar was produced from tobacco stem through HTC, and was pelletized in the presence of various binders. The effect of four kinds of binders (K2CO3, CaCO3, xanthan gum and carboxymethyl cellulose) on the basic fuel properties, mechanical strength, moisture adsorption and combustion characteristics was investigated. The results showed that K 2CO3 assisted pellet had decreased compressive strength, increased hygroscopicity and high combustion residues. The compressive strength of pellets increased with increasing amount CaCO3 binder probably due to the hardening effect of enhanced adhesion attraction forces between adjacent particles. Meanwhile, the CaCO3 assisted pellet exhibited the lowest moisture uptake behavior. In addition, the introduction of organic binders led to improved mechanical strength, especially for xanthan binder, which could be ascribed to the formation of solid bridges and enhancement of adhesion forces between particles. TGA results suggested that the binder-assisted pellets exhibited desirable combustion characteristics such as decreased ignition temperature and increased comprehensive combustibility index. Kinetic parameters of the combustion process of binder-assisted pellets were also determined by employing the model free isoconversional Kissinger–Akahira–Sunose method. This study demonstrated that HTC of tobacco stem combined with pelletization in the presence of appropriate binders provide an alternative for solid biofuel pellets production. Graphic abstract Hydrothermal carbonization (HTC) of tobacco stem combined with pelletization in the presence of appropriate binders provide an alternative for solid biofuel pellets production.
Keywords Biomass · Hydrochar · Pelletization · Binders · Combustion properties · Tobacco stem
Statement of Novelty * Yi Shen [email protected] * Ke Zhang [email protected] Extended author information available on the last page of the article
Hydrothermal carbonization combined with pelletization provide a promising strategy for the fuel utilization of biomass. To our knowledge, this is the first report on the preparation of binders-assisted pellets from tobacco residues. This study not only systematically investigated the effect of different binders on the physical and combustion properties
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of hydrochar pellets produced from HTC of tobacco stem, but also provided a basis for the production of energy-dense hydrochar based pellets.
Introduction Large amounts of tobacco stem are gener
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