Fluidized bed gasification of biomass – In bed investigation of gas and tar formation

Mayerhofer, Matthias; Fendt, S.; Spliethoff, Hartmut; Gaderer, Matthias

doi:10.1016/j.fuel.2013.06.025

Cited by 32 publications

(15 citation statements)

References 15 publications

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“…Untuk penukaran termokimia tenaga, biojisim boleh digunakan melalui tiga proses berbeza: penggasan, pirolisis dan pembakaran langsung [11]. Daripada proses-proses itu tadi, penggasan biojisim adalah satu kaedah yang berpotensi untuk menghasilkan bahan bakar gas yang bersih untuk pembakaran dalam dandang dan dalam enjin pembakaran dalam [12,13]. Dalam keadaan sebenar, produk sampingan yang tidak diingini seperti tar akan dihasilkan oleh proses penukaran penggasan [14].…”

Section: Pengenalanunclassified

Combustion Performance of Syngas From Biomass Waste in Gas Burner System/Prestasi Pembakaran Syngas Dari Sisa Biojisim Dalam Sistem Pembakar Gas

et al. 2018

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Syngas from biomass residues is an alternative fuel to address the ever-increasing fossil fuel supply problem and the issue of releasing toxic gases from the fossil fuel burning process. Syngas is also a renewable fuel and features environmentally friendly fuel. This study was conducted to investigate the performance of the syngas produced from oil palm shells (PKS) using fluidized bed gasifier. In this study, the produced syngas was tested for its combustion performance from the aspect of gas combustion temperature and resulting emission concentrations such as nitrogen oxide (NOx), carbon monoxide (CO) and sulfur dioxide (SO2). The resulting syngas was studied at different ratio of air velocities to fuels. From the test, the ratio of velocity of air to fuel affects the gas combustion temperature and emission emission concentration. By increasing the air velocity to fuel ratio during the gasification process produces more positive effects primarily in improving the temperature of the gas burner combustion and reducing carbon monoxide (CO) emissions. However, the concentration of sulfur dioxide release (SO2) and nitrogen oxide (NOx) increase.

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Section: Pengenalanunclassified

Combustion Performance of Syngas From Biomass Waste in Gas Burner System/Prestasi Pembakaran Syngas Dari Sisa Biojisim Dalam Sistem Pembakar Gas

et al. 2018

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“…In the case of silica sand, with a higher bulk density, the biomass particles float on the top of the bed. The contact between volatiles and the bed material is limited since the released volatiles migrate directly to the freeboard [40] where the temperature is higher than the bed temperature as the partial combustion of biomass does not take place inside the bed (see bed and freeboard temperatures in Table 3). The temperature in the freeboard is higher than 750 o C, and consequently, oxygenated species are converted into PAH via cyclopentadiene radicals which then combine to generate aromatics with two or more rings as sugessted by Fitzpatrick et al [41] and Yu et al [42].…”

Section: Tar Compositionmentioning

confidence: 99%

Effect of sepiolite bed material on gas composition and tar mitigation during C. cardunculus L. gasification

Serrano

Sánchez-Delgado

Horvat

2017

Chemical Engineering Journal

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Sepiolite, a clay mineral that is commonly used as adsorbent, is proposed as bed material for biomass gasification in a lab-scale bubbling fluidized bed. In order to compare the obtained gas composition and tar generation, silica sand has been used as reference bed material. C. cardunculus L. has been employed as biomass feedstock. The operating temperature is varied from 830 to 875°C, at constant equivalence ratio (ER) of 0.30. The gas produced with sepiolite as bed material has a slightly lower quality than the gas generated with silica sand, the lower heating value (LHV) is 0.4-1.4 MJ/Nm 3 lower for sepiolite than for silica sand. However, the tar generation is rather reduced in the sepiolite bed and the tar composition is also different among the bed materials: the polycyclic aromatic hydrocarbons fraction (PAH) is drastically reduced while oxygenated compounds arise in the sepiolite tests. Sepiolite properties such as surface area and morphology have been analysed by means of specific surface area (BET) and scanning electron microscopy (SEM-EDS) before and after the experiments. The fuel behaviour and the properties of sepiolite induce the adsorption of tars and molten ashes on the sepiolite surface, leading to a much better performance in terms of tar mitigation and agglomeration.

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“…Multiphase flow technology is a mature industrial technology that is widely used in many fields such as the petrochemical, power, and metallurgical fields, among others [20,21]. This solves the problem of fluidity in traditional industries, which transforms solid particles into "quasi-fluids" with "fluid properties".…”

Section: Introductionmentioning

confidence: 99%

Biogas Production and Heat Transfer Performance of a Multiphase Flow Digester

Guo

Zhou

et al. 2019

Energies

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Traditional static anaerobic digestion technology presents the disadvantages of a low gas production rate and long digestion cycle, which is not conducive to the treatment of livestock manure. A 12 m3 multiphase flow anaerobic digester (MFD) was developed in this study to improve the biogas production rate and maintain constant temperature digestion during winters. Full-scale field experiments were conducted on the biogas production rate at different temperatures, the dynamic digestion effects, and the dynamic heating digestion effects of the system at Sichuan, China. A comparison of the dynamic and static digestion results of 50 days indicated that the biogas production for the dynamic digestion (DD) group was 115.22 m3 or 127.1% higher than that of the static digestion (SD) group with the same digestion temperature. The results of the heat transfer performance experiment revealed that the heat transfer rate of the system increased significantly, and the temperature of the biogas slurry increased rapidly. The optimization analysis of the system was based on the experimental results of the relationship between the slurry temperature and biogas production rate, and the economical digestion temperature of the system was proposed and calculated. Different insulation materials or insulation thicknesses have an influence on the economical digestion temperature. Additionally, the economical digestion temperature of the system in which the polystyrene insulation layer with a thickness of 90 mm was used, was found to be 27.2 °C. When digestion temperature was 22.3 °C, the energy efficiency ratio (EER) of dynamic anaerobic digestion system is 1. The advantages of MFD are low biogas production unit cost and high heat and mass transfer rate. However, the disadvantage of high operation energy consumption needs further improvement. And additional energy was required when system digestion temperature below 22.3 °C. The proposed MFD and dynamic anaerobic digestion system can play a significant role in using biomass resources and promoting the development of biogas projects.

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Fluidized bed gasification of biomass – In bed investigation of gas and tar formation

Abstract: h i g h l i g h t s Axial tar and gas profiles are measured in fluidized bed and freeboard. Most tar compounds are released at the beginning of the freeboard. Inside the fluidized bed heterocyclic tar compounds are hardly measured.

Cited by 32 publications

References 15 publications

Combustion Performance of Syngas From Biomass Waste in Gas Burner System/Prestasi Pembakaran Syngas Dari Sisa Biojisim Dalam Sistem Pembakar Gas

Combustion Performance of Syngas From Biomass Waste in Gas Burner System/Prestasi Pembakaran Syngas Dari Sisa Biojisim Dalam Sistem Pembakar Gas

Effect of sepiolite bed material on gas composition and tar mitigation during C. cardunculus L. gasification

Biogas Production and Heat Transfer Performance of a Multiphase Flow Digester

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