Project Details
Abstract
The demanding of the energy is increasing, but the supply of the low-sulfur fossil fuels is decreasing.
When high-sulfur fossil fuel oxides, sulfur dioxide is formed and causes environmental problems. In industry,
limestone rich in calcium carbonate is usually used for in-situ desulfation. Calcium carbonate reacts with
high temperature gaseous sulfur dioxide and oxygen to form calcium sulfate or calcium sulfite. Due to the
micro-structure of limestone, uniform, networking, and shrinking-core sulfation models have been reported.
The (partially) sulfated powders are removed from the system as the bottom or the fly ashes. When using
limestone powders for desulfation in circulating fluidized bed combustor, powder sulfation causes the
dynamical changes of the powder composition, density and size. These powder properties affect the particle
transport phenomena in the combustor significantly. In this project, we will develop a reliable model to
effectively predict the composition, size and density of the limestone powders, together with their flow
patterns in a circulating fluidized bed combustor.
In this two-year project, both the experimental and theoretical modeling works are to be carried out. In
the first year, a circulating fluidized bed combustor system will be constructed. This combustor will allow the
calcium carbonate powders to be continuously fed to the system together with the high sulfur content
petroleum coke powders. The (partially) sulfated powders are removed as the bottom ashes or fly ashes and
the compositions, the sizes and the densities of the removed powders will be measured. In the second year,
the sulfation mechanisms are developed by coupling the shrinking-core model, the collisional model and the
hydrodynamic fluidizing behavior of the powders. The predicted particle flow patterns and the properties of
the removed powders will be experimentally validated.
Project IDs
Project ID:PB10108-2793
External Project ID:NSC101-2221-E182-065
External Project ID:NSC101-2221-E182-065
Status | Finished |
---|---|
Effective start/end date | 01/08/12 → 31/07/13 |
Keywords
- limestone
- sulfation
- transport phenomena
- reaction kinetics
- circulating fluidized bed combustor
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