Laboratory evaluation of high-temperature sulfur removal sorbents for direct coal-fired turbines: Final report Page: 6 of 459
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ABSTRACT
Direct coal-fired turbine concepts currently being developed
require substantial levels of sulfur removal from high-temperature gas
streams. Calcium-based sorbents, limestones, dolomites, limes and lime
hydrates, are capable of sulfur removal in direct coal-fired turbine
combustor environments at temperatures up to 1200*C. Two types of
desulfurizer processes are considered in this report using calcium-based
sorbents: fluidized bed desulfurizers using coarse sorbent particles
(300-1000 m), and entrained desulfurizers using fine sorbent particles
(1-40 pm). Small-scale laboratory tests were performed on a variety of
calcium-based sorbents to determine the kinetics of sulfation and
sulfidation over ranges of conditions applicable to both types of
desulfurizer processes. Correlations are developed in the report for
the effect of pressure, temperature, and particle size. Engineering
models are also developed for both desulfurizer types that incorporate
the laboratory reaction kinetics and predict potential commercial
performance and performance trends. It is concluded that both
desulfurizer concepts can be effective in direct coal-fired turbines,
with calcium-to-sulfur molar feed ratios ranging from 1.5 to 3.0, if the
correct calcium-based sorbent is selected, and if applicable design and
operating conditions are identified. Both desulfurizer concepts have
limitations and key development requirements, and site and fuel specific
engineering assessment is required to select the best concept for a
given combustor system. The influence of'the desulfurizer concepts on
turbine protection, through their influence on particle loading and
alkali release must also be assessed.i
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Newby, R.A.; DeZubay, E.A. & Chamberlin, R.M. Laboratory evaluation of high-temperature sulfur removal sorbents for direct coal-fired turbines: Final report, report, June 1, 1987; Pittsburgh, Pennsylvania. (https://digital.library.unt.edu/ark:/67531/metadc1188699/m1/6/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.