Abstract
NKK has developed a new combustion controller that reduces both NOx and CO concentrations in the exhaust gas discharged from municipal refuse incineration furnaces. We have found that the manipulation of the cooling air flow rate is important because it affects the furnace temperature and O2, NOx and CO concentrations in exhaust gas. This controller manipulates the flow rate of the cooling air. It monitors the furnace temperature and O2, NOx and CO concentrations as process variables, and outputs the cooling air flow rate control signal as a manipulated variable. This multi-input/single-output controller was designed using by a fuzzy control algorithm and tested on site at a municipal refuse furnace. The result of the on-site test was quite successful.
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