... Cogeneration Systems
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Steam is generated in circulating fluidized bed boilers. The main advantage of CFB technology is the reduction in the emission of acid rain producing components, primarily sulfur dioxide and nitrous oxides. Sulfur dioxide is reduced by the addition of calcium containing products, such as limestone, to the combustion chamber. The limestone reacts with the sulfur dioxide to produce calcium sulfate, which is removed from the combustion process with the remaining ash. Nitrous oxide production is minimized by maintaining the combustion temperature at approximately 1,600 degrees Fahrenheit; a level much lower than conventional fossil fuel combustion temperatures which normally exceed 2,200 degrees Fahrenheit. The fly ash waste produced is sent to a local company which reuses the ash for structural fill and treatment. Steam is distributed through an extensive network of underground steam and condensate return piping in excess of fifty miles. |
