Development of Ultra Low NOx Non-premixed Combustion Technology for Hydrogen

Abstract

Development of high-performance hydrogen combustion technology is underway to expand the use of hydrogen toward building a decarbonized society. Hydrogen is characterized by a higher combustion temperature than conventional hydrocarbon fuels such as LNG or LPG, which causes formation of a large amount of thermal NOx. Focusing on the characteristics of hydrogen, which enables stable combustion even at low air ratios, it was demonstrated that NOx formation in boiler furnaces can be significantly reduced by appropriately mixing hydrogen with combustion air. In addition, numerical simulation has been conducted to elucidate the mechanism of low NOx combustion.