conduct an experiment to show that when we heat high quality coal, a , a gas eides which can be burnt.
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Explanation:
fluidized-bed combustion system is amorphous—that is, it has not undergone melting and resolidification.
Schematic diagram of a fluidized-bed combustion boiler.
Schematic diagram of a fluidized-bed combustion boiler.
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Fluidized-bed combustion systems are particularly suitable for coals of low quality and high sulfur content because of their capacity to retain sulfur dioxide (SO2; a pollutant gas) within the bed and their ability to burn coals of high or variable ash content. When limestone (calcium carbonate; CaCO3) or dolomite (a mixture of calcium and magnesium carbonates; CaMg(CO3)2) is introduced into the bed along with the coal, the limestone decomposes to calcium oxide (CaO), which then reacts in the bed with most of the SO2 released from the burning coal to produce calcium sulfate (CaSO4). The CaSO4 can be removed as a solid by-product for use in a variety of applications. In addition, partially spent calcium or magnesium can be regenerated and recycled by a variety of techniques. The formation and emission of nitrogen oxides (NOx; another pollutant gas) are inhibited by low operating temperatures. Fluidized-bed combustors, in general, need additional equipment (such as cyclone separators) to separate fines containing a high amount of combustibles and recycle them back into the system.
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