Comparison between ‘slow’ and ‘flash’ pyrolysis oils from biomass

Maggi, R.; Delmon, Bernard

doi:10.1016/0016-2361(94)90007-8

Cited by 106 publications

(61 citation statements)

References 3 publications

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“…water-solubles and -insolubles) [5-8, 15, 16], or listings of components without quantitative concentrations [5,7,8,10,11,14,16,19]. The composition used for model calculations here is therefore a representative one based on typical information from a number of researchers, and does not pretend to be an accurate model of a particular product.…”

Section: Fuel Propertiesmentioning

confidence: 99%

“…The main components are organic acids, aldehydes, ketones, phenols, anhydrosugars such as levoglucosan, pyrolytic lignin (comprising guaiacyl-and syringylbased fragments of the original lignin polymer) and substantial quantities of water, typically 25% [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22]. Usually only trace amounts of hydrocarbons are present, the vast majority of the components being oxygenates.…”

Section: Introductionmentioning

confidence: 99%

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A model for the evaporation of biomass pyrolysis oil droplets

Hallett¹,

Clark²

2006

Fuel

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This paper presents a numerical model for the evaporation and pyrolysis of a single droplet of pyrolysis oil derived from biomass. Continuous thermodynamics theory for multicomponent droplet evaporation is used, with the fuel being represented by four fractions: organic acids, aldehydes/ketones, water, and pyrolytic lignin, each of which is described by a separate distribution function. Pyrolysis of the lignin fraction is included, and detailed properties for all fractions are presented. The model is compared with the results of suspended droplet experiments, and is shown to give good predictions of the times of the major events in the lifetime of a droplet.

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Section: Fuel Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A model for the evaporation of biomass pyrolysis oil droplets

Hallett¹,

Clark²

2006

Fuel

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show abstract

“…The pyrolysis process generates a complex mixture of oxygenated organic compounds that span a wide range of molecular weights (esp. carboxylic acids, aldehydes, hydroxyketones, sugars, and phenolics) (Radlein et al, 1987;Evans andMilne, 1987z 1987b;Maggi and Delmon, 1994;Meier et .,, ,…”

Section: Physical and Chemical Properties Of Pyrolysis Oilsmentioning

confidence: 99%

Combustion Properties of Biomass Flash Pyrolysis Oils: Final Project Report

Shaddix¹,

Hardesty²

1999

107

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“…Slow pyrolysis normally does not yield significant oils (~20-30%) and yields higher char solid fractions (on the same order as the liquid yields or less). Maggi and Delmon (1994) compare slow and fast pyrolysis products and conclude that their differences are more substantial than the fee dstock differences. But we propose that there is a continuum of product variations between idealized slow and fast pyrolysis regimes.…”

Section: Figure 1 a Diagram Of The Proposed Processmentioning

confidence: 99%

An economic analysis of mobile pyrolysis for northern New Mexico forests.

Brady¹,

Brown²,

Mowry³

et al. 2011

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In the interest of providing an economically sensible use for the copious small-diameter wood in Northern New Mexico, an economic study is performed focused on mobile pyrolysis. Mobile pyrolysis was selected for the study because transportation costs limit the viability of a dedicated pyrolysis plant, and the relative simplicity of pyrolysis compared to other technology solutions lends itself to mobile reactor design. A bench-scale pyrolysis system was used to study the wood pyrolysis process and to obtain performance data that was otherwise unavailable under conditions theorized to be optimal given the regional problem.Pyrolysis can convert wood to three main products: fixed gases, liquid pyrolysis oil and char. The fixed gases are useful as low-quality fuel, and may have sufficient chemical energy to power a mobile system, eliminating the need for an external power source. The majority of the energy content of the pyrolysis gas is associated with carbon monoxide, followed by light hydrocarbons. The liquids are well characterized in the historical literature, and have slightly lower heating values comparable to the feedstock. They consist of water and a mix of hundreds of hydrocarbons, and are acidic. They are also unstable, increasing in viscosity with time stored. Up to 60%ii of the biomass in bench-scale testing was converted to liquids. Lower (~550ºC) furnace temperatures are preferred because of the decreased propensity for deposits and the high liquid yields.A mobile pyrolysis system would be designed with low maintenance requirements, should be able to access wilderness areas, and should not require more than one or two people to operate the system. The technoeconomic analysis assesses fixed and variable costs. It suggests that the economy of scale is an important factor, as higher throughput directly leads to improved system economic viability. Labor and capital equipment are the driving factors in the viability of the system. The break-even selling price for the baseline assumption is about $11/GJ, however it may be possible to reduce this value by 20-30% depending on other factors e valuated in the non-baseline scenarios. Assuming a value for the char co-product improves the analysis.Significantly lower break-even costs are possible in an international setting, as labor is the dominant production cost.iii

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Comparison between ‘slow’ and ‘flash’ pyrolysis oils from biomass

Cited by 106 publications

References 3 publications

A model for the evaporation of biomass pyrolysis oil droplets

A model for the evaporation of biomass pyrolysis oil droplets

Combustion Properties of Biomass Flash Pyrolysis Oils: Final Project Report

An economic analysis of mobile pyrolysis for northern New Mexico forests.

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