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Title: Oxy-coal Combustion Studies Task 3 Topical Report, Utah Clean Coal Program
Authors: Wendt, J. O. L.
Eddings, E. G.
Lighty, J. S.
Ring, T.
Smith, P. J.
Thornock, J.
Jia, Y.
Morris, W.
Pedel, J.
Rezeai, D.
Wang, L.
Zhang, J.
Kelly, K.
Issue Date: 6-Jan-2012
Type: Report
Pages: 168
Abstract: The objective of this project is to move toward the development of a predictive capability with quantified uncertainty bounds for pilot-scale, single-burner, oxy-coal operation. This validation research brings together multi-scale experimental measurements and computer simulations. The combination of simulation development and validation experiments is designed to lead to predictive tools for the performance of existing air fired pulverized coal boilers that have been retrofitted to various oxy-firing configurations. In addition, this report also describes novel research results related to oxy-combustion in circulating fluidized beds. For pulverized coal combustion configurations, particular attention is focused on the effect of oxy-firing on ignition and coal-flame stability, and on the subsequent partitioning mechanisms of the ash aerosol. To these ends, the project has focused on the following: • The development of reliable Large Eddy Simulations (LES) of oxy-coal flames using the Direct Quadrature Method of Moments (DQMOM) (Subtask 3.1). The simulations were validated for both non-reacting particle-laden jets and oxy-coal flames. • The modifications of an existing oxy-coal combustor to allow operation with high levels of input oxygen to enable in-situ laser diagnostic measurements as well as the development of strategies for directed oxygen injection (Subtask 3.2). Flame stability was quantified for various burner configurations. One configuration that was explored was to inject all the oxygen as a pure gas within an annular oxygen lance, with burner aerodynamics controlling the subsequent mixing. • The development of Particle Image Velocimetry (PIV) for identification of velocity fields in turbulent oxy-coal flames in order to provide high-fidelity data for the validation of oxy-coal simulation models (Subtask 3.3). Initial efforts utilized a laboratory diffusion flame, first using gas-fuel and later a pulverized-coal flame to ensure the methodology was properly implemented and that all necessary data and image-processing techniques were fully developed. Success at this stage of development led to application of the diagnostics in a large-scale oxy-fuel combustor (OFC). • The impact of oxy-coal-fired vs. air-fired environments on SOx (SO2, SO3) emissions during coal combustion in a pilot-scale circulating fluidized-bed (CFB) (Subtask 3.4). Profiles of species concentration and temperature were obtained for both conditions, and profiles of temperature over a wide range of O2 concentration were studied for oxy-firing conditions. The effect of limestone addition on SO2 and SO3 emissions were also examined for both air- and oxy- firing conditions. • The investigation of O2/CO2 and O2/N2 environments on SO2 emissions during coal combustion in a bench-scale single-particle fluidized-bed reactor (Subtask 3.5). Moreover, the sulfation mechanisms of limestone in O2/CO2 and O2/N2 environments were studied, and a generalized gassolid and diffusion-reaction single-particle model was developed to study the effect of major operating variables. • The investigation of the effect of oxy-coal combustion on ash formation, particle size distributions (PSD), and size-segregated elemental composition in a drop-tube furnace and the 100 kW OFC (Subtask 3.6). In particular, the effect of coal type and flue gas recycle (FGR, OFC only) was investigated.
URI: http://hdl.handle.net/123456789/11156
Appears in Collections:ICSE Management

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