Advantageous Effects Of Low Air RatioCombustion In An AdvancedStoker-type Waste Incinerator

Measures such as low air-ratio combustion and exhaust gas recirculation (EGR) have become the subject of a great deal of attention with a view to reducing the amount of environment are impacting substances from the waste incineration process, and also to making the most effective use of energy. However, it has been understood that there would be considerable difficulty utilizing low airratio combustion in a conventional grate furnace. The application of hightemperature air combustion technology for enhancing sound combustibility could provide solutions to these problems and has been previously studied. A practical test was conducted at a 105 ton per day capacity municipal solid waste stoker-type incineration plant. The test demonstrated that stable low airratio combustion operation is possible at a stoichiometry of 1.3 with EGR and high-temperature air combustion technology resulting in a 17% decrease in flue gas flow, an energy efficiency improvement of 10%, and a significant reduction of toxic product emission such as nitrogen oxides and dioxins when compared with a stoichiometry of 1.6 in the conventional process.