Effects of feedstock on co-pyrolysis of biomass and coal in a free-fall reactor

Wei, Ligang; Zhang, Li; Xu, Shimei

doi:10.1016/s1872-5813(11)60044-3

Cited by 37 publications

(26 citation statements)

References 11 publications

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“…The interaction between coal and biomass during thermal co-conversion is an issue yet to be solved; some devolatilization and pyrolysis results of coal and biomass blends have revealed no or very little synergy between the two fuels [44][45][46][47][48][49][50][51][52][53][54][55][56] while others have revealed significant synergy [43,[57][58][59][60][61][62][63][64][65][66][67][68][69][70][71]. It is important to segregate the synergistic effect from the catalytic effect engendered by biomass mineral matters; most of the studies that found synergistic effects between the two fuels failed to segregate these two phenomena.…”

Section: Feedstockmentioning

confidence: 99%

“…However, the existence of non-catalytic synergistic effect remains controversial. Some researchers [43,[57][58][59][60][61][62][63][64][65][66][67][68][69][70][71][101][102][103][104][105][106][107][108] have shown evidence of synergy between biomass and coal while others [44][45][46][47][48][49][50][51][52][53][54][55][56] found no evidence of synergy. Trevor and Kandiyoti [109] pointed out that the way biomass components are intermeshed affects the distribution of pyrolysis products.…”

Section: Synergy Through Other Mechanismsmentioning

confidence: 99%

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A Review of Thermal Co-Conversion of Coal and Biomass/Waste

2014

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Abstract:Biomass is relatively cleaner than coal and is the only renewable carbon resource that can be directly converted into fuel. Biomass can significantly contribute to the world's energy needs if harnessed sustainably. However, there are also problems associated with the thermal conversion of biomass. This paper investigates and discusses issues associated with the thermal conversion of coal and biomass as a blend. Most notable topics reviewed are slagging and fouling caused by the relatively reactive alkali and alkaline earth compounds (K 2 O, Na 2 O and CaO) found in biomass ash. The alkali and alkaline earth metals (AAEM) present and dispersed in biomass fuels induce catalytic activity during co-conversion with coal. The catalytic activity is most noticeable when blended with high rank coals. The synergy during co-conversion is still controversial although it has been theorized that biomass acts like a hydrogen donor in liquefaction. Published literature also shows that coal and biomass exhibit different mechanisms, depending on the operating conditions, for the formation of nitrogen (N) and sulfur species. Utilization aspects of fly ash from blending coal and biomass are discussed. Recommendations are made on pretreatment options to increase the energy density of biomass fuels through pelletization, torrefaction and flash pyrolysis to reduce transportation costs.

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Section: Feedstockmentioning

confidence: 99%

Section: Synergy Through Other Mechanismsmentioning

confidence: 99%

A Review of Thermal Co-Conversion of Coal and Biomass/Waste

2014

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“…32 Biomass is available in bulk and can be found in agricultural residues (rice husk, pine cone, bagasse, wheat straw, etc. [33][34][35][36][37], wood residues (pine, weed, and fir sawdust 38 ), and in industrial and municipal solid wastes (palm shell, wheat straw, legume straw, walnut shell, and so on 31,[39][40][41][42][43]. Natural rubber is a biomass usually obtained from the rubber tree, guayule plant, russian dandelion, and rubber rabbitbrush.…”

Section: Introductionmentioning

confidence: 99%

Potential use of natural rubber to produce liquid fuels using hydrous pyrolysis – a review

2016

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Natural rubber is a tropical plantation crop that mainly consists of hydrocarbon polyisoprene (cis-1,4-polyisoprene). Rubber can be converted through depolymerization into liquid, which can be used as fuels or chemical feedstock. This paper provides information on natural rubber and its alternative sources worldwide. Although we focus on hydrous pyrolysis, we also introduced various depolymerization processes, including pyrolysis, gasification, chemical degradation, catalytic cracking and hydrogenation. Hydrous pyrolysis improves the depolymerization process, such that raw materials can be fed without requiring a drying process. This process can also be conducted at low temperatures, and water can be solely used as reaction medium and can be easily separated from the oil product. This paper also reviews the role of process parameters such as temperature, rubber to water ratio, reaction time, and type of gases on product quality and quantity. Moreover, this study highlights the environmental and economic feasibility of hydrous pyrolysis.

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“…As the amount of SS increased after 50 wt%, more carbon‐containing gases such as CO 2 were available because of the HT of the increased volatile matter from SS. Thus, as SS had high ash content, some metals could act as catalyst for a water–gas shift reaction, which could increase the yield of H 2 and CO 2 . The experimental and theoretical values of gas yield are also shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Effect of the Amount of Sludge on Physicochemical Properties and Chemical Structure of Low‐rank Coal under Hydrothermal Conditions

Liu

Cardoso

Zhao

et al. 2017

Asia-Pacific J Chem Eng

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Sewage sludge mixed with Yunnan low-rank coal was treated by hydrothermal treatment (HT) at mild temperature and high-pressure conditions. The fuel characteristics and chemical structure of HT solid products were investigated to explore the synergistic effects between low-rank coal and sludge. The results indicated that the fuel properties of HT solid products were negatively influenced as the amount of sludge increased, but there were synergistic positive effects on the content of volatile matter, fixed carbon, oxygen, and calorific value when the amount of sludge was more than 30 wt% in the HT at 300°C. More hydrogen groups in sludge were involved in the hydrogen transfer reactions between the low-rank coal and sludge, which promoted the occurrence of synergistic effects during the HT process. CO 2 and H 2 were the main gas products, but the yield of both gases produced by the HT of sewage sludge was significantly higher than that of low-rank coal. The aromaticity of HT solid products reduced from 60.65% to 51.83%, and the aliphaticity increased from 39.35% to 48.17% when the amount of sludge increased from 10 to 70 wt%.

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Effects of feedstock on co-pyrolysis of biomass and coal in a free-fall reactor

Cited by 37 publications

References 11 publications

A Review of Thermal Co-Conversion of Coal and Biomass/Waste

A Review of Thermal Co-Conversion of Coal and Biomass/Waste

Potential use of natural rubber to produce liquid fuels using hydrous pyrolysis – a review

Effect of the Amount of Sludge on Physicochemical Properties and Chemical Structure of Low‐rank Coal under Hydrothermal Conditions

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