High-pressure co-gasification of coal and biomass in a fluidized bed

McLendon, T. Robert; Lui, Alain P.; Pineault, Richard; Beer, Stephen K.; Richardson, Steven W.

doi:10.1016/j.biombioe.2003.08.003

Cited by 111 publications

(48 citation statements)

References 6 publications

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“…Many co-conversion studies related to co-gasification studies have focused on parametric studies of the gasifier [31][32][33][34][35][37][38][39][40][41][42][43], mostly omitting the mechanisms by which mixtures of coal and biomass interact and how coal and biomass thermally degrade. 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].…”

Section: Feedstockmentioning

confidence: 99%

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%

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

2014

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“…[1][2][3][4][5][6].This originates an increase in gas yield and its HHV, which leads to a higher cold gas efficiency. These results agree with the studies published by other authors who employed different types of gasifiers such as pressurized spouted bed and fluidised bed reactors [13,[17][18][19][20].…”

Section: Reaction Temperaturementioning

confidence: 99%

“…Petroleum coke is an important byproduct of petroleum refineries, and it is employed as feedstock in gasification systems, in combination with coal or separately, to produce a syngas that can be used to satisfy the increasing demand for hydrogen by refineries, and other applications [5]. Moreover, the cogasification of biomass with coal, could contribute to the reduction of the fossil fuels dependency and CO 2 emissions, as biomass is known to be neutral as regards CO 2 emissions [6]. During co-gasification coal, biomass and other wastes are put together and converted into a gaseous product stream that can be used to produce electricity, hydrogen, chemicals and liquid transportation fuels.…”

Section: Introductionmentioning

confidence: 99%

“…Additionally, biomass and coal are considered as potential feedstocks for the supply of syngas (CO and H 2 ) used in the synthesis of liquid fuels by gasification. In recent years, the advantages of the cogasification of woody biomass and coal have been reported by several researchers, including the reduction in the production of tar when coal is cogasified with biomass, which can produce large amounts of tar when gasified alone [6,[9][10][11].…”

Section: Introductionmentioning

confidence: 99%

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High-pressure co-gasification of coal with biomass and petroleum coke

Fermoso

Arias

Plaza

et al. 2009

Fuel Processing Technology

181

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The effect of the main operation variables (temperature, pressure and gasifying agent composition) on gas production and other process parameters, such as carbon conversion, cold gas efficiency and high heating value, during the steam-oxygen gasification of a bituminous coal were studied. It was observed that temperature and oxygen concentration were the most influential variables during the gasification process. In addition, co-gasification tests of binary blends of a bituminous coal with different types of biomass (up to 10 %) and petroleum coke (up to 60 %), as well as ternary blends of coal-petcoke-biomass (45-45-10 %) were conducted in order to study the effect of blending on gas production and carbon conversion.

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“…3) Previously, in order to understand the possible applications of coal/agricultural waste in high temperature industries, a number of studies concerning co-firing, 4) co-gasification 5) and copyrolysis 6,7) of blended fuels of coal and agricultural waste materials have been carried out. Carbon from wood char has been used for iron making in the past 8,9) while the mini blast furnaces in Brazil use wood char on a daily basis.…”

Section: Introductionmentioning

confidence: 99%

Structural Transformation of Agricultural Waste/Coke Blends and Their Implications during High Temperature Processes

et al. 2011

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With a sharp increase in demand and production, palm oil wastes, (i.e. empty fruit bunches, fibre and shells) are generated, out of which a large amount ends up in landfill. In such a context, alternative solutions are needed to reduce the impact of these agricultural wastes on the environment. The present paper investigates the effect of addition of agricultural waste materials on the combustion behavior of its blends with metallurgical coke (MC). Two types of agricultural waste materials, palm shell and coconut shell, were mixed in different proportion with MC, while the gas phase reactions were studied at 1 200°C in a drop tube furnace (DTF). In the tested conditions, the blends containing agricultural waste materials indicated higher combustion efficiencies compared to MC alone. Carbon structure analysis were performed through 13 CP/MAS NMR spectroscopy showing various groups of carbons present in the agricultural waste samples ranging from aliphatic to aromatic carbons. The morphology of the samples was studied through Scanning Electron Microscope (SEM). SEM provided a qualitative description of the pore structure in the raw samples as well as the changes occurring following the gas phase reactions in the DTF. It was found that the particles derived from the wastes became increasingly deformed and lost their cell lumen. Surface area measurements were found to be in good agreement with the SEM images, supporting the higher combustion efficiency of the blends in comparison to coke alone. The present study suggests that agricultural waste materials have the potential to partially replace MC, as an auxiliary fuel in metallurgical processes.

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High-pressure co-gasification of coal and biomass in a fluidized bed

Cited by 111 publications

References 6 publications

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

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

High-pressure co-gasification of coal with biomass and petroleum coke

Structural Transformation of Agricultural Waste/Coke Blends and Their Implications during High Temperature Processes

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