Melting Behavior of Ashes from the Co-combustion of Coal and Straw

Straw may be used today as a substitute fuel to lower the greenhouse gas emissions from traditional coal-fired power plants and provide green-based electricity. It may also provide an alternative source of income to the local farmers helping the developed countries to support sustainable development...

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Bibliographic Details
Published in:Energy & fuels 2007-09, Vol.21 (5), p.3004-3009
Main Authors: Arvelakis, S, Frandsen, F. J
Format: Article
Language:English
Subjects:
01 COAL, LIGNITE, AND PEAT
09 BIOMASS FUELS
ADHESION
Applied sciences
ASHES
BOILERS
COAL
COCOMBUSTION
Combustion of heterogeneous mixtures. Incineration
Combustion. Flame
CRYSTALLIZATION
DEPOSITION
Energy
Energy. Thermal use of fuels
Exact sciences and technology
MELTING
PULVERIZED FUELS
STRAW
Theoretical studies. Data and constants. Metering
VISCOSITY
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Summary:Straw may be used today as a substitute fuel to lower the greenhouse gas emissions from traditional coal-fired power plants and provide green-based electricity. It may also provide an alternative source of income to the local farmers helping the developed countries to support sustainable development. The use of straw as a co-firing feedstock in traditional coal-fired plants is associated with operational problems, such as deposition, agglomeration, and/or corrosion, mainly because of the higher amounts of alkali metals and chlorine in straw compared to coal. This may lead to unscheduled shutdowns and costly repairs, increasing the operational costs and the cost of the produced power. In this paper, the melting characteristics of several ash fractions sampled from different parts of a pilot-scale pulverized fuel (PF) boiler operating with different coal/straw mixtures is determined by measuring the ash viscosity using a high-temperature rotational viscometer. The produced data provide information on the melting of the ash material, its flow characteristics, and the rates of crystallization and recrystallization, as a function of the temperature. This information may be used to modify the temperature profile in the different parts of the boiler to reduce the deposition of the ash material. The results show that the straw in the co-combustion mixture changes the viscosity characteristics of the produced ash fractions. The viscosity of the different ash fractions is lowered, as the percentage of straw in the co-combustion mixture increases, and leads to higher stickiness of the produced ash particles at lower temperatures.
ISSN:0887-0624
1520-5029
DOI:10.1021/ef070045m