Influence of Ash Deposit Chemistry and Structure on Physical and Transport Properties

Baxter, Larry; Gale, Thomas K.; Sinquefield, Scott A.; Sclippa, Gian

doi:10.1007/978-94-009-1559-6_99

Cited by 11 publications

(11 citation statements)

References 14 publications

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“…Over the past fifteen years, a much better understanding of the alkali vaporization and subsequent ash deposition phenomena has been developed (Miles, et al, 1996a(Miles, et al, , 1996bJenkins, et al, 1998;Baxter, et al, 1997aBaxter, et al, , 1997bBaxter, et al, , 1992Dayton, 1997Dayton, , 1994. Ash vaporization involves a complex interaction of the alkali salts in the biomass.…”

Section: Alkali Compoundsmentioning

confidence: 99%

Hot Gas Conditioning: Recent Progress with Larger-Scale Biomass Gasification Systems; Update and Summary of Recent Progress

Stevens¹

2001

125

105

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As a result of environmental and policy considerations, there is increasing interest in using renewable biomass resources as feedstock for power, fuels, and chemicals and hydrogen. Biomass gasification is seen as an important technology component for expanding the use of biomass. Advanced biomass gasification systems provide clean products that can be used as fuel or synthesis gases in a variety of environmentally friendly processes.Advanced end-use technologies such as gas turbines or synthesis gas systems require high quality gases with narrowly defined specifications. Other systems such as boilers may also have fuel quality requirements, but they will be substantially less demanding. The gas product from biomass gasifiers contains quantities of particulates, tars, and other constituents that may exceed these specified limits. As a result, gas cleaning and conditioning will be required in most systems.Over the past decade, significant research and development activities have been conducted on the topic of gas cleanup and conditioning. This report provides an update of efforts related to large-scale biomass gasification systems and summarizes recent progress. Remaining research and development issues are also summarized.

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Section: Alkali Compoundsmentioning

confidence: 99%

Hot Gas Conditioning: Recent Progress with Larger-Scale Biomass Gasification Systems; Update and Summary of Recent Progress

Stevens¹

2001

125

105

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“…Wood has excellent heat insulation properties and low thermal conductivity values which equates to greater heat insulating properties [10]. Thermal properties are strongly influenced by the physical structures of the deposits, particle size, porosity and sintered condition [11,12].…”

Section: Introductionmentioning

confidence: 99%

Particle Sizes and Thermal Insulation Properties of Some Selected Wood Materials for Solar Device Applications

Oluyamo¹,

Bello²

2014

IOSRJAP

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“…For instance, Srinivasachar et al [3,4] have studied formation of the ash intermediates, which consist of gases, liquids and solids. Raask [5] elucidated deposit initiation, and Walsh et al [6,7] studied deposit characteristics and growth. Beer et al [8] tried to model ash behaviors.…”

Section: Introductionmentioning

confidence: 99%

Experimental Studies on the Normal Impact of Fly Ash Particles with Planar Surfaces

Dong

Xie

et al. 2013

Energies

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This paper presents the results of a comprehensive program of experiments in which fly ash particles were impacted under controlled conditions against a flat steel surface. The overall aim of these experiments was to gain an understanding of the ash deposition process in a pulverized coal boiler system. A continuous nitrogen flow carrying fly ash particles was used to examine the effect of particle incident velocity and particle diameter (d p ) on the normal restitution coefficient, and of the particle diameter on the critical velocity. The effect of the incident normal velocity and particle diameter on the normal restitution coefficient was also examined. The results show that the normal restitution coefficient increases rapidly with increasing incident velocity when this incident velocity is less than the yield velocity, and rapidly decreases with increasing incident velocity when the incident velocity is greater than the yield velocity. The critical velocity, determined solely by the first-contact energy loss, is proportional to d p −5/6 and therefore becomes larger for smaller particles. For instance, in the present work, the velocity v c of a particle with diameter of 85 μm is 0.19 m/s, which increases to 0.42 m/s for particles with a diameter of 65 μm.

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Influence of Ash Deposit Chemistry and Structure on Physical and Transport Properties

Cited by 11 publications

References 14 publications

Hot Gas Conditioning: Recent Progress with Larger-Scale Biomass Gasification Systems; Update and Summary of Recent Progress

Hot Gas Conditioning: Recent Progress with Larger-Scale Biomass Gasification Systems; Update and Summary of Recent Progress

Particle Sizes and Thermal Insulation Properties of Some Selected Wood Materials for Solar Device Applications

Experimental Studies on the Normal Impact of Fly Ash Particles with Planar Surfaces

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