A direct fired furnace consists of three parts: a combustion system, a flue gas system, and a control system: 1. The combustion system consists of a burner, a combustion air system, a gas supply system, and an ignition system. A burner: Two burners are set up in a staggered arrangement in the flue gas duct to facilitate uniform mixing of heated flue gas (facilitating uniform thermal expansion of the flue gas duct and uniform inlet temperature of SCR); B Combustion air system: Under normal circumstances, flue gas is used as the combustion air, and in the event of a fault, it switches to air combustion; C ignition system: using plasma ignition; Shichu 2. The flue gas system consists of a flue gas diversion device, a combustion chamber, and a mixing chamber. The flue gas is divided into three streams by the diversion device, and the two streams on both sides flow through the combustion chamber from the outside for preheating. Afterwards, the smoke in the middle, as well as the high-temperature smoke generated by combustion
