New type of ultra-low emission sintering furnace: using blast furnace gas for direct ignition, safe and fast. The external type has been changed to an internal direct combustion furnace, saving 20% energy and fully burning carbon monoxide and flue gas oxygen content. The technological innovation and application of Shengyuan direct fired furnace in the denitrification system of steel sintering machine, and the disruptive innovation of Beijing Yongbo Technology.