Characterization and pelletization of cotton stalk hydrochar from HTC and combustion kinetics of hydrochar pellets by TGA

Zhu, Guangkuo; Yang, Li; Gao, Ying; Xu, Jiayu; Chen, Haijun; Zhu, Yuezhao; Wang, Yinfeng; Chuan-hua, Liao; Lu, Chunmei; Zhu, Chong

doi:10.1016/j.fuel.2019.02.039

Cited by 99 publications

(42 citation statements)

References 50 publications

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“…Previous studies have indicated that the fuel quality of raw biomass can significantly be increased by the carbonization process and the resultant hydrochar has the potential to be used as a source of energy in firing units to replace conventional coal or other sources partially and reduce the environmental impacts [18,43]. By pelletizing hydrochars, fuel quality can be improved [11], and in addition to a decrease in the generation of nuisance dust, benefits related to transport, storage, and combustion are achieved. Liu, Quek, and Balasubramanian [6] concluded that the enhanced mechanical durability and considerably improved combustion characteristics make hydrochar pellets more suitable as solid fuels vis-à-vis raw biomass pellets.…”

Section: Implementation Of Hydrochar Pellet Systemsmentioning

confidence: 99%

“…While the increased bulk density and mechanical strength reduce the storage and transportation costs, the dimensional uniformity serves to ease the handling and feeding of the same, while making them amenable to many industrial applications [8,9]. As Ahlroth et al [10] and Zhu et al [11] have observed, an additional benefit is that the potential heating value of the solid product (hydrochar) can also be enhanced hereby, vis-à-vis the corresponding raw biomass.…”

Section: Introductionmentioning

confidence: 99%

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A Comprehensive Environmental Life Cycle Assessment of the Use of Hydrochar Pellets in Combined Heat and Power Plants

et al. 2020

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Hydrothermal carbonization (HTC) has been seen as a potentially beneficial process for converting wet biomass into value-added products. It is, however, necessary to overcome the challenges associated with handling the powdered form of hydrochar—a solid product of the HTC process—by controlling the formation of dust and facilitating smoother transportation and distribution in a potentially wide marketplace. In this paper, the authors investigate the environmental consequences of different alternatives for using hydrochar pellets produced from mixed sludges from pulp and paper mills in Sweden, using the environmental life cycle assessment (E-LCA). Two scenarios for possible end-uses of hydrochar in combined heat and power (CHP) plants as a source of energy (heat and electricity) were assessed. In these scenarios, hydrochar pellets were assumed to be combusted in CHP plants, thereby avoiding the use of combustible solid wastes (Scenario A) and coal (Scenario B), respectively, to recover energy in the form of electricity and heat. The environmental damages to Human Health, Ecosystem Quality, Climate Change, and Resources are evaluated based on 1 tonne of dry sludge as the functional unit. The results from this analysis illustrate that Scenario B, in which hydrochar replaces coal, offers the greatest reduction in all the environmental damage characterizations, except the Resources category. The displacement of energy-based coal due to hydrochar combustion contributed most significantly to the environmental damages wrought by the system—ranging from 52% in Resources to 93% in Ecosystem Quality. Overall, the results highlight that the application of hydrochar pellets for energy recovery to offset waste- and coal-based energy sources has great environmental benefits. The favorability of sludge hydrochar over solid wastes as fuel for CHP plants may be counter-intuitive at first, since HTC is an energy-intensive process, but when accounting for the necessity of dependence on imports of wastes for instance, the hydrochar pellet may well emerge as a good option for CHPs in Sweden.

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Section: Implementation Of Hydrochar Pellet Systemsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Comprehensive Environmental Life Cycle Assessment of the Use of Hydrochar Pellets in Combined Heat and Power Plants

et al. 2020

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“…[145] reported that H/C, O/C and calorific value of cellulose derived hydrochar at 200 °C shows no significant changes while for xylan derived hydrochar changes dramatically at the same temperature using Van Krevelen diagram which indicates initiation temperature of HTC for cellulose is above 200 °C. [196] determine the different, H/C and O/C atomic ratios of cotton stalk hydrochar from Van Krevelen diagram with different HTC temperature and reaction times.…”

Section: Hydrothermal Carbonization Of Biomassmentioning

confidence: 99%

A Comprehensive Review on Hydrothermal Carbonization of Biomass and its Applications

et al. 2019

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Hydrothermal carbonization (HTC) has gained a lot of interest in the last few years for the process production of hydrochar from the different kinds of biological materials such as agricultural waste. Therefore, a thorough review of the literature on HTC has been conducted, which is more energy-efficient and involves hydrochar preparation at a lower temperature without any specific requirements for pressure. This review article primarily differentiates between the hydrochar and biochar developed from various sources. Also, a comparative analysis has been done to evaluate the maximum efficiency of hydrochar production. The various parameters, which influence the hydrochar yield to include pH, temperature, the concentration of the modifying agent, duration of exposure, salt, and phenolic compounds, have also been highlighted in this review. The scale-up processes for industrial level hydrochar production, along with bioreactor designs, have also been discussed. We have also focused on various applications of hydrochar, such as adsorbent in wastewater treatment, carbon sequestration, gas adsorption and in the field of agriculture for soil amendment. The adsorption effects of hydrochar towards the partial and proportionate adsorption of heavy metals and hazardous chemicals have been depicted. This review of the literature clearly illustrates the role of HTC in environmental remediation of soil, air and water and its usage in various industries.

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“…Inúmeros trabalhos demonstram que a CHT é um processo ambientalmente vantajoso para o tratamento de resíduos ou biomassas, e o carvão assim obtido é similar aos carvões obtidos por pirólise [11][12][13][14][15][16][17].…”

Section: Introductionunclassified

Adsorção de azul de metileno em hidrocarvões de resíduos têxteis

et al. 2020

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RESUMO Os produtos têxteis, cada vez mais presentes em nosso dia-a-dia, geram uma grande quantidade de resíduos, sejam eles de forma sólida ou líquida. Dar o destino correto ou até mesmo transformar os resíduos sólidos é o novo desafio a ser enfrentado. Os resíduos sólidos, geralmente retalhos de tecidos, contém grande quantidade de compostos orgânicos, que podem ser carbonizados. Neste contexto, o principal objetivo do presente estudo foi a síntese de hidrocarvão utilizando resíduos têxteis. Os hidrocarvões formados podem ser utilizados como adsorventes de corantes, como o azul de metileno. A síntese de hidrocarvões utilizou uma razão resíduo/água de 3/80 massa (g) /volume (mL) a uma temperatura de 220 ºC. O tempo foi investigado entre 6 e 12 horas, sendo que este último obteve 71,2% de carbono, obtido por EDS e seguiu para caracterização por FTIR-ATR, DRX, MEV e pHpcz. O material proposto apresentou significativa capacidade de adsorção em meio básico, em torno de 72 mg.g-1. Os dados cinéticos obtidos foram melhor ajustados no modelo de pseudo segunda-ordem sugerindo que o processo de adsorção foi controlado por quimissorção, ocorrendo o compartilhamento ou troca de elétrons entre adsorvente e adsorvato. O modelo de Langmuir apresentou melhor correlação com os dados de equilíbrio. Os hidrocarvões sintetizados com resíduos têxteis apresentam, portanto, grande potencial em aplicações, visando à remoção de poluentes orgânicos de solução aquosa.

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Characterization and pelletization of cotton stalk hydrochar from HTC and combustion kinetics of hydrochar pellets by TGA

Cited by 99 publications

References 50 publications

A Comprehensive Environmental Life Cycle Assessment of the Use of Hydrochar Pellets in Combined Heat and Power Plants

A Comprehensive Environmental Life Cycle Assessment of the Use of Hydrochar Pellets in Combined Heat and Power Plants

A Comprehensive Review on Hydrothermal Carbonization of Biomass and its Applications

Adsorção de azul de metileno em hidrocarvões de resíduos têxteis

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