A Comparative Study of the Gasification of Solid Refuse Fuel in Downdraft Fixed Bed and Bubbling Fluidized Bed Reactors

Park, Se Won; Lee, Jang Soo; Yang, Won Seok; Alam, Tanvir; Seo, Yong Chil

doi:10.1007/s12649-018-0431-6

Cited by 19 publications

(22 citation statements)

References 47 publications

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“…The heat transfer area was 241 increased due to the increase in surface area due to cell-wall destruction, and the heat conductivity was 242 increased; thus, the drying efficiency was increased upon increasing the temperature of the dry matter 243 [43]. High hydrothermal reaction temperatures seemed to reduce the oxygen-containing functional 244 groups during the increase in the carbon aromatic structure, thus making the hydrochar hydrophobic 245 [42].…”

Section: Natural Drying Efficiencymentioning

confidence: 99%

“…Dehydration is generally explained by the removal of hard siloxanes, and decarboxylation is the thermal cracking of long-chain carboxylic acids to carbonize the biomass by lowering the H/C and O/C ratios. As a result, the unit calorific value of the solid product is considered to be increased [42]. In addition, the decrease in sulfur and nitrogen components in feedstock, which are precursors of gaseous contaminants as the reaction temperature rises, is associated with the conversion to the gas or liquid phase as the volatile components decrease.…”

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Studies on the Gasification Performance of Sludge Cake Pre-Treated by Hydrothermal Carbonization

et al. 2020

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Proper treatment and careful management of sewage sludge are essential because its disposal can lead to adverse environmental impacts such as public health hazards, as well as air, soil, and water pollution. Several efforts are being made currently not only to safely dispose of sewage sludge but also to utilize it as an energy source. Therefore, in this study, initiatives were taken to valorize sewage sludge cake by reducing the moisture content and increasing the calorific value by applying a hydrothermal treatment technique for efficient energy recovery. The sludge cake treated at 200 °C for 1 h was found to be the optimum condition for hydrothermal carbonization, as, in this condition, the caloric value of the treated sludge increased by 10% and the moisture content removed was 20 wt.%. To recover energy from the hydrothermally treated sludge, a gasification technology was applied at 900 °C. The results showed that the product gas from hydrothermally treated sludge cake had a higher lower heating value (0.98 MJ/Nm3) and higher cold gas efficiency (5.8%). Furthermore, compared with raw sludge cake, less tar was generated during the gasification of hydrothermally treated sludge cake. The removal efficiency was 28.2%. Overall results depict that hydrothermally treated sewage sludge cake could be a good source of energy recovery via the gasification process.

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Section: Natural Drying Efficiencymentioning

confidence: 99%

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Studies on the Gasification Performance of Sludge Cake Pre-Treated by Hydrothermal Carbonization

et al. 2020

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“…Energy plays a vital role in our modern life. An accessible and secured supply of energy has become imperative for the sustainable growth of society [1]. To meet its energy demand, the world is heavily dependent on fossil fuel at present [2].…”

Section: Introductionmentioning

confidence: 99%

“…In addition, it is a propitious route to produce fruitful end products using various synthesis routes [10]. In the past decades, gasification of biomass and waste has been comprehensively studied by many researchers [11][12][13], whereas, in the present day, gasification of solid recovered fuel (SRF), an alternative fuel produced from the combustibles in MSW, is one of the key topics in waste gasification [1,[14][15][16].In South Korea, during the SRF manufacturing process, there is a significant amount of residue generated which approaches 40 wt% of input waste, and the disposal cost occupies 20% of the annual operating cost in a few manufacturing facilities [17]. The SRF residue produced as leftovers during the SRF manufacturing process is usually discarded in landfill because of its high ash content (>20 wt%) and high moisture content (>10 wt%) but low energy content (<3500 kcal/kg).…”

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Co-Gasification of Treated Solid Recovered Fuel Residue by Using Minerals Bed and Biomass Waste Blends

et al. 2020

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Solid recovered fuel (SRF) residue, which is leftovers from the SRF manufacturing process, usually is discarded in landfill because of its low heating value and high ash and moisture content. However, it could be used as a fuel after mechanical and biological treatment. Gasification experiments were conducted on treated SRF residue (TSRFR) to assess the viability of syngas production. Efforts were also made to improve the gasification performance by adding low-cost natural minerals such as dolomite and lime as bed material, and by blending with biomass waste. In the case of additive mineral tests, dolomite showed better performance compared to lime, and in the case of biomass blends, a 25 wt% pine sawdust blend with TSRFR showed the best performance. Finally, as an appropriate condition, a combined experiment was conducted at an equivalence ratio (ER) of 0.2 using a 25 wt% pine sawdust blend with TSRFR as a feedstock and dolomite as the bed material. The highest dry gas yield (1.81 Nm 3 /kg), with the highest amount of syngas (56.72 vol%) and highest lower heating value (9.55 MJ/Nm 3 ) was obtained in this condition. Furthermore, the highest cold gas efficiency (48.64%) and carbon conversion rate (98.87%), and the lowest residue yield (11.56%), tar (0.95 g/Nm 3 ), and gas pollutants content was observed.Energies 2020, 13, 2081 2 of 16 48,934 tons of MSW per day [8]. Usually, this MSW carries an incredible amount of materials like plastic, paper, wood, metals, and glass which can be recycled easily and effectively by doing energy recovery [9].Gasification of MSW is a productive way of generating heat and power. In addition, it is a propitious route to produce fruitful end products using various synthesis routes [10]. In the past decades, gasification of biomass and waste has been comprehensively studied by many researchers [11][12][13], whereas, in the present day, gasification of solid recovered fuel (SRF), an alternative fuel produced from the combustibles in MSW, is one of the key topics in waste gasification [1,[14][15][16].In South Korea, during the SRF manufacturing process, there is a significant amount of residue generated which approaches 40 wt% of input waste, and the disposal cost occupies 20% of the annual operating cost in a few manufacturing facilities [17]. The SRF residue produced as leftovers during the SRF manufacturing process is usually discarded in landfill because of its high ash content (>20 wt%) and high moisture content (>10 wt%) but low energy content (<3500 kcal/kg). However, the South Korean government has set a goal to reach 3% landfill for overall waste and zero landfill for recyclable waste by the year 2020 [8]. In addition, by the year 2050, the South Korean government aimed to expand the share of renewable and new energy to 20% [18]. Thus, to support the South Korean government's vision, in this study, an effort was made to recover energy from SRF residue via the gasification process. However, before applying the gasification process, to improve the quality of SRF residue it was tr...

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Refuse derived fuel produced in Brazil: physico-chemical analysis, standards and opportunities for energy recovery

de Oliveira,

Ducom,

de Castilhos Júnior

et al. 2024

J Mater Cycles Waste Manag

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A Comparative Study of the Gasification of Solid Refuse Fuel in Downdraft Fixed Bed and Bubbling Fluidized Bed Reactors

Cited by 19 publications

References 47 publications

Studies on the Gasification Performance of Sludge Cake Pre-Treated by Hydrothermal Carbonization

Studies on the Gasification Performance of Sludge Cake Pre-Treated by Hydrothermal Carbonization

Co-Gasification of Treated Solid Recovered Fuel Residue by Using Minerals Bed and Biomass Waste Blends

Refuse derived fuel produced in Brazil: physico-chemical analysis, standards and opportunities for energy recovery

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