Production of Torrefied Solid Bio-Fuel from Pulp Industry Waste

Huang, Michael R. S.; Chang, Chia‐Chi; Yuan, Min-Hao; Chang, Ching‐Yuan; Wu, Chao‐Hsiung; Shie, Je-Lueng; Chen, Yen-Hau; Chen, Yi‐Hung; Ho, Chungfang; Chang, Wei-Ren; Yang, Tzong–Jer; Lin, Fengyi

doi:10.3390/en10070910

Cited by 21 publications

(20 citation statements)

References 34 publications

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Section: Torrefaction Of Sewage Sludgementioning

confidence: 99%

“…Huang et al used a laboratory scale batch reactor to perform the torrefaction of waste from pulp industries [26]. The obtained energy densification ratios varied between 1.26 and 1.5, depending on the process parameters [26]. Huang et al investigated the microwave co-torrefaction of sewage sludge with Leucaena and noticed a synergetic effect of the use of combined feedstocks for torrefaction [27,28].…”

Section: Torrefaction Of Sewage Sludgementioning

confidence: 99%

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Torrefaction as a Valorization Method Used Prior to the Gasification of Sewage Sludge

et al. 2019

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The gasification and torrefaction of sewage sludge have the potential to make the thermal utilization of sewage sludge fully sustainable, thus limiting the use of expensive fossil fuels in the process. This includes sustainability in terms of electricity consumption. Although a great deal of work has been performed so far regarding the gasification of sewage sludge and some investigations have been performed in the area of its torrefaction, there is still a gap in terms of the influence of the torrefaction of the sewage sludge on its subsequent gasification. This study presents the results from the torrefaction tests, performed on a pilot scale reactor, as well as two consecutive steam gasification tests, performed in an allothermal fixed bed gasifier, in order to determine if torrefaction can be deemed as a primary method of the reduction of tar content for the producer gas, from the aforementioned gasification process. A comparative analysis is performed based on the results obtained during both tests, with special emphasis on the concentrations of condensable compounds (tars). The obtained results show that the torrefaction of sewage sludge, performed prior to gasification, can indeed have a positive influence on the gas quality. This is beneficial especially in terms of the content of heavy tars with melting points above 40 °C.

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Section: Torrefaction Of Sewage Sludgementioning

confidence: 99%

Section: Torrefaction Of Sewage Sludgementioning

confidence: 99%

Torrefaction as a Valorization Method Used Prior to the Gasification of Sewage Sludge

et al. 2019

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“…Some amount of work on thermal treatment for utilization of the sewage sludge has been performed, including some fundamental work, using thermogravimetric analysis [20,21]. Huang et al torrefied waste from pulp industries in a laboratory scale, batch reactor and determined energy densification ratios varying from 1.26 up to 1.5 depending on the process conditions [22]. Studies performed by Huang et al on microwave co-torrefaction of sewage sludge with leucaena reported synergistic effect between the two feedstocks, during torrefaction [23,24].…”

Section: Dry and Wet Torrefaction And Pyrolysis Of Sewage Sludgementioning

confidence: 99%

“…Heat obtained this way was recovered in HRSG to generate steam for a steam turbine. Some operational problems have been reported [22,24]: cold spots in the coke bed, due to inadequate penetration by plasma torches [49]; too short life span of the refractory of the reactor-caused by adding additional refractory to remediate the problem of the cold spots [49]; erosion of the refractory of the after-burner (which caused the operator to lower the exit temperature of syngas from 1200 • C to 750 • C) [49]. Reactor requires auxiliary substances to operate.…”

Section: Slagging Gasifier As a Feasible Tool For Gasification And Inmentioning

confidence: 99%

Novel Concept of an Installation for Sustainable Thermal Utilization of Sewage Sludge

et al. 2018

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This study proposes an innovative installation concept for the sustainable utilization of sewage sludge. The aim of the study is to prove that existing devices and technologies allow construction of such an installation by integration of a dryer, torrefaction reactor and gasifier with engine, thus maximizing recovery of the waste heat by the installation. This study also presents the results of drying tests, performed at a commercial scale paddle dryer as well as detailed analysis of the torrefaction process of dried sewage sludge. Both tests aim to identify potential problems that could occur during the operation. The scarce literature studies published so far on the torrefaction of sewage sludge presents results from batch reactors, thus giving very limited data of the composition of the torgas. This study aims to cover that gap by presenting results from the torrefaction of sewage sludge in a continuously working, laboratory scale, isothermal rotary reactor. The study confirmed the feasibility of a self-sustaining installation of thermal utilization of sewage sludge using low quality heat. Performed study pointed out the most favorable way to use limited amounts of high temperature heat. Plasma gasification of the torrefied sewage sludge has been identified that requires further studies.

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“…Globally, biomass fuel is becoming more and more attractive as a suitable substitute for fossil fuels due to the increasing demand for clean energy [2][3][4]. Furthermore, biomass is a renewable energy source, and its importance will increase as national energy policies and strategies focus more heavily on renewable sources and conservation [5].…”

Section: Introductionmentioning

confidence: 99%

Potential of Tropical Fruit Waste Biomass for Production of Bio-Briquette Fuel: Using Indonesia as an Example

et al. 2017

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Within developing countries, there is an appeal to use waste biomass for energy generation in the form of bio-briquettes. This study investigated the potential use of bio-briquettes that are produced from the waste biomass of the following tropical fruits: durian (Durio zibethinus), coconut (Cocos nucifera), coffee (Coffea arabica), cacao (Theobroma cacao), banana (Musa acuminata) and rambutan (Nephelium lappaceum). All fruit waste biomass samples exhibited an extremely high level of initial moisture content (78.22% in average). Fruit samples with the highest proportion of fruit waste biomass (of total unprocessed fruit mass) were represented by cacao (83.82%), durian (62.56%) and coconut (56.83%). Highest energy potentials (calorific value) of fruit waste biomass were observed in case of coconut (18.22 MJ·kg −1 ), banana (17.79 MJ·kg −1 ) and durian (17.60 MJ·kg −1 ) fruit samples, whereas fruit waste biomass with the lowest level of ash content originated from the rambutan (3.67%), coconut (4.52%), and durian (5.05%) fruit samples. When investigating the energy demands to produce bio-briquettes from such feedstock materials, the best results (lowest amount of required deformation energy in combination with highest level of bio-briquette bulk density) were achieved by the rambutan, durian and banana fruit waste biomass samples. Finally, all investigated bio-briquette samples presented satisfactory levels of bulk density (>1050 kg·m −3 ). In conclusion, our results indicated the practicability and viability of such bio-briquette fuel production, as well as supporting the fact that bio-briquettes from tropical fruit waste biomass can offer a potentially attractive energy source with many benefits, especially in rural areas.

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Production of Torrefied Solid Bio-Fuel from Pulp Industry Waste

Cited by 21 publications

References 34 publications

Torrefaction as a Valorization Method Used Prior to the Gasification of Sewage Sludge

Torrefaction as a Valorization Method Used Prior to the Gasification of Sewage Sludge

Novel Concept of an Installation for Sustainable Thermal Utilization of Sewage Sludge

Potential of Tropical Fruit Waste Biomass for Production of Bio-Briquette Fuel: Using Indonesia as an Example

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