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Fluidized Bed Combustion Seminar Report

Combustion and gasification are seen as potential alternatives to resolve this waste management issue and growing number of local waste incineration facilities have successfully adopted these techniques. Municipal solid waste has been successfully burnt in a grate combustion system or mass burn combustion system. Fluidized bed combustors can be designed to combust any solid waste without the use of supplemental fuel. a continuation study on combustion behavior of solid waste in a fluidized bed combustor is carried out by changing the fluidization number and total air factor.

Researchers have conducted various experiments with mixed solid Knowledge of the physical characteristics and chemical composition refuse derived fuel (RDF) which is fuel originated from segregated municipal solid waste has been used in a fluidized bed combustor .combustion of RDF was carried out in a bubbling fluidized bed of a square column result‟s are found out that the freeboard (region above the surface) temperature was higher than the bed temperature due to high volatile matter contents in the RDF. The temperature distribution in the combustor was slightly affected by the changing of the air ratio.

Results showed that the combustion efficiency was significantly increased at higher air ratios. It was also pointed out that gas temperature increased as the gas traveled up the freeboard region and the combustion efficiency was observed to increase at higher freeboard temperature. Furthermore, the physical characteristics of municipal solid waste such as moisture content, volatile matter content, fixed carbon content and ash content also vary depending on the individual waste component. Chemical compositions of the municipal solid wastes such as carbon content, oxygen content, hydrogen content also vary according to the waste itself.

Physical and chemical characteristics of municipal solid waste are important in the design of a combustion system. For example, information on the carbon, hydrogen and oxygen content of the municipal solid waste or mixed solid waste enables the calculation of air requirement for the complete combustion, excess air combustion or even starved air combustion (gasification), thus enabling the estimation of air compressor power and costing. Physical characteristic provides information of the waste itself such as the density of the waste which gives an indication of the mixing of the waste and fluidization medium especially in a fluidized bed combustion system. The amount of water in the waste gives an indication of the burning profile and the sustainability of the waste combustion inside the fluidization medium (sand).

Volatile matter gives information whether the combustion is on the freeboard (region above the surface of the sand bed) or bed combustion. Therefore, information of the solid waste characterization, physical and chemical compositions are crucial as data gathered are useful for the design and operation of the combustion system. In line with the issues mentioned, the study is to investigate the optimum fluidization number and air factor for sustainable combustion of mixed solid waste in a fluidized bed system.

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