Ignition device and reaction furnace used for dual-pressurization dilute nitric acid production

The invention relates to a dual-pressurization method dilute nitric acid production device, in particular to an ignition device used for dual-pressurization dilute nitric acid production. The ignitiondevice comprises a rotation device, a transmission shaft, an ignition arm, a gas conveying pipeline and an electronic ignition device. The top end of the transmission shaft and the rotation device for providing power are fixedly installed together. The bottom end of the transmission shaft is fixedly connected with the ignition arm which is arranged in the radial direction along the transmission shaft and is adjacent to the portion above a catalyst. Due to the implementation of the technical scheme mentioned above, one branch of the gas conveying pipeline in the ignition device conducts ignition through the electronic ignition device and sprays ignited flame downwards above the ignition arm; and the other branch of the gas conveying pipeline sprays the gas downwards through a large ignition pipe spray nozzle, the