An Intensification of Biomass and Waste Char Gasification in a Gasifier

Paulauskas, Rolandas; Zakarauskas, Kęstutis; Striūgas, Nerijus

doi:10.3390/en14071983

Cited by 10 publications

(6 citation statements)

References 26 publications

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“…Experimental parametric investigations have been proposed to predict performance of fixed bed gasifiers. Gasification temperatures and air flow rate [13], air flow and biomass type [14], air and air-steam flow [15], moisture content and particle size [16], and recirculation of pyrolysis gas [17,18] are example of parameters tested in autothermal and continuous mode. The dependence of syngas heating value, permanent gas composition, tar content, energy efficiencies were in each case reported.…”

Section: Introductionmentioning

confidence: 99%

Effects of Oxygen and Steam Equivalence Ratios on Updraft Gasification of Biomass

Cerone

Zimbardi

2021

Energies

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Several experimental datasets available on the gasification of different lignocellulosic feedstocks were used to correlate the flow of gasifying agents with the performance of updraft gasification in an autothermic 200 kWth pilot plant. The feedstocks used included eucalyptus wood chips, torrefied eucalyptus and spruce chips, lignin rich residues from biorefined straw and reed, shells of almond and hazelnut, which were gasified in flows of air, air and steam, oxygen, oxygen and steam. Thermal profiles inside the gasifier and gas quality in terms of incondensable gas and tar content were recorded and used to calculate the energy efficiency of converting solid feedstock into gaseous and liquid carriers. Common behaviors and parametric functionalities were identified to better understand the process and the most efficient tools to achieve the desired products. In analyzing data, the ratio steam to biomass was reported in terms of the equivalence ratio, ER(H2O) i.e., the fraction of the stoichiometric quantity required to convert the feedstock into H2 and CO2. The use of steam was useful to stabilize the process and to tune the H2/CO ratio in the syngas which reached the value of 2.08 in the case of oxy-steam gasification of lignin rich residues at ER(H2O) of 0.25. Larger use of steam depressed the process by lowering the average temperature of the bed, which instead increased steadily with ER(O2). The production of tar depends on the biomass type and a substantial reduction can be achieved with the torrefaction pretreatment. The same effect was observed increasing the residence time of the syngas in the reactor, typically achieved using oxygen instead of air as main gasification flow or reducing the ER(H2O). Oxy-steam gasification of torrefied wood led to the best results in terms of cold gas efficiency and low heating value when carried out in the ranger 0.23–0.27 of both the ERs.

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Section: Introductionmentioning

confidence: 99%

Effects of Oxygen and Steam Equivalence Ratios on Updraft Gasification of Biomass

Cerone

Zimbardi

2021

Energies

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“…Also, an increase in the gasification rate is facilitated by an increase in the air supply into the working area of the gasifier, although an excessive increase in the air supply will not ensure the growth of the gasification coefficient. This statement is relevant to the results of studies [20,21,26]. This can be explained, according to the authors, by the fact that when the optimal equivalence ratio is reached, an increase in the air supply does not lead to the intensification of the thermochemical transformations of the fuel in the gasifier.…”

Section: Fig 2 Change In the Coefficient Of Gasification Rate Dependi...mentioning

confidence: 95%

Experimental study of gasification rate of fast-growing willow biomass

Jasinskas

Kukharets

Sukmaniuk³

et al. 2023

22nd International Scientific Conference Engineering for Rural Development Proceedings

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The biomass of fast-growing hybrid plants can be an effective source for energy conversion. The biomass of energy plants: hybrid poplar, hybrid willow etc., is a potential fuel for obtaining thermal and electrical energy. It should be noted that a small size downdraft gasifier, which is economically available and the most reliable equipment, is the most suitable for the use in small or medium production conditions for energy conversion of fast-growing willow biomass. The experimental confirmation of the mathematical model of fast-growing willow biomass gasification rate is proposed to carry out in the paper. According to the model, the rate of biomass gasification is proportional to the amount of biomass remaining ungasified. The gasification rate coefficients of four fractions of fast-growing willow biomass pieces and pellets were determined by the research results. During the research, the supply of oxidizer (air) to the working area (zone) of the downdraft gasifier was changed. When the air supply into a gasifier is minimal, the gasification rate coefficient is actually the same for all biomass fractions of fast-growing willow Salix Viminalis, L. and is 4.1·10-5 ± 0.1·10-5 s-1. With an increase in air supply the gasification rate coefficient increases and reaches its maximum value at an air supply of 9·10-3 m3·s-1, further increase in the air volume does not lead to an increase in the gasification rate coefficient. As the size of fuel pieces decreases, the rate coefficient also increases and is 9.476·10-5 s-1 for the fraction with the smallest pieces.

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“…As mentioned earlier, in anaerobic digestion, intensification focuses on ways to enhance and improve biomass gasification. To optimize the process of gasification, Paulauskas et al [70] investigated the efficacy of residual char gasification in a gasifier. The study used char made from wood and sewage sludge under different operating conditions in the gasification set-up.…”

Section: Intensification Of Gasification Processmentioning

confidence: 99%

Recent Advancements in Anaerobic Digestion and Gasification Technology

2023

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In recent times, there has been a growing demand for the use of biomass as an alternative energy due to its sustainable nature. At present, anaerobic digestion and gasification has been proven as a promising technology for exploiting this energy from biomass. This review aims to provide a comprehensive and detailed analysis of the combination of anaerobic and gasification technology as a hybrid system for sustainable waste-to-energy generation. This review reveals that both anaerobic digestion and biomass gasification have been successfully demonstrated as technologies for energy recovery. However, to improve the conversion efficiency in both technologies, the utilization of an intensifier, additive, and enhancer will be required. Moreover, temperature has been identified as a major factor affecting the technologies and should be considered. The bibliometric study conducted revealed that China is the leading country and has set the pace for other countries to follow suit. Subsequently, waste-to-energy research could be easily implemented on a global scale. This study recommends an experimental study of anaerobic digestion and gasification as a hybrid system.

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An Intensification of Biomass and Waste Char Gasification in a Gasifier

Cited by 10 publications

References 26 publications

Effects of Oxygen and Steam Equivalence Ratios on Updraft Gasification of Biomass

Effects of Oxygen and Steam Equivalence Ratios on Updraft Gasification of Biomass

Experimental study of gasification rate of fast-growing willow biomass

Recent Advancements in Anaerobic Digestion and Gasification Technology

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