Abstract
This research deals with the design and analysis of the nozzle and bed materials required for fluidized bed boiler. The design parameters (Diameter of the bed particle, Range of the terminal velocities, Minimum Fluidization /Bubbling velocities, Maximum amplitude and steady velocities) were calculated using Microsoft Excel by interpreting and solving various formulas. Best bed material was selected on the basis of their various characteristics like porosity, adhesive or cohesive properties, resistance to flow etc. An important characteristic change of air distributor velocity with combustion chamber temperature has been established. ANSYS was used as a simulation tool for the analysis. Static Structural solver was used to carry out the strength analysis of the designed wind box. Likewise, computational fluid dynamics (CFD) was carried out using FLUENT solver. Air flow inside the wind box and fluidization phenomena was verified using FLUENT. Furthermore, the designed system was checked for its validity by comparing the results from the Excel sheets and theoretical calculations with simulation results. Lastly, correlation between temperature and velocity inside combustion temperature were determined to identify their relationship with each other.
Highlights
Coal accounts for one of the major fuels utilized in Nepal and is almost exclusively consumed mainly by industrial sectors for heating and boiling processes in bricks, cement, steel production
The research is focused in designing a “Circulatory Fluidized Bed Boiler” with the optimum design of air distribution system, selection of suitable bed materials and computational study of movement of bed materials
Sand was selected as bed material
Summary
Coal accounts for one of the major fuels utilized in Nepal and is almost exclusively consumed mainly by industrial sectors for heating and boiling processes in bricks, cement, steel production. Apart from fewer coal reserves, coal for industrial usage is imported from other countries, primarily India. The concept of fluidized bed combustion has been emerged as a promising alternative in order to address the above issues. It bears substantial advantages over conventional firing system as it offers multiple benefits such as fuel flexibility, higher combustion efficiency, compact boiler design and reduced emission of noxious pollutants such as SOx and NOx [1]. Rice husk and agricultural wastes are burnt in these boilers. These boilers have industrial scale size and are not available in any universities of Nepal. The research is focused in designing a “Circulatory Fluidized Bed Boiler” with the optimum design of air distribution system, selection of suitable bed materials and computational study of movement of bed materials
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