Reuse Of Waste Ashes Formed At Oil Shale Based
Power Industry In Estonia
Author(s)
R. Kuusik, M. Uibu, A. Trikkel & T. Kaljuvee
Abstract
Estonian oil shale belongs to low-grade fossil fuels and by its combustion huge
quantities of ash (currently about 5 million tons annually) are formed. Since
1959 pulverized firing (PF) has been used, and circulating fluidized bed
combustion (CFBC) technology has recently been implemented – two units each
of 215 MW capacity are in operation. In previous investigations of PF ashes the
results have been used as a basis for several large-scale applications like
production of construction materials and conditioning/neutralizing of soils; a
developing of industrial applications for CFBC ashes is hindered by insufficient
basic data. In the current investigation attention was focused on the reactivity of
ashes towards SO2 and CO2 in heterogeneous gas – solid and gas – water – solid
systems, being important for characterization of ashes as sorbents for the capture
of acidic gases named from flue gases. The significant differences in chemical
and phase composition as well as in surface properties of ashes have been
shown. The SO2-binding characteristics for CFBC ashes are higher than for PF
ashes and they have more perspective as dry sorbents of sulphur dioxide. Also,
under wet carbonization conditions, CFBC ashes can be carbonized more deeply
as compared to PF ashes. As a result of carbonation, ashes could be
environmentally friendly landfilled and abatement of CO2 emissions will be
achieved.
Keywords: Estonian oil shale, pulverized firing, circulating fluidized bed
combustion, waste ashes, reactivity, sulphur dioxide, carbon dioxide.
1 Introduction
Estonian power supply is over 90% covered by oil shale fired thermal power
plants. Local solid fossil fuel oil shale is characterized by low heating value
Keywords
Estonian oil shale, pulverized firing, circulating fluidized bedcombustion, waste ashes, reactivity, sulphur dioxide, carbon dioxide.
Related Book
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