Continuous production device for polyferric chloride and method thereof

A continuous production device for polyferric chloride, comprising:

• a first mixing pipeline, a second reaction pipeline, a third reaction pipeline, a concentration device and a drying device;
• wherein the first mixing pipeline is provided with a first sodium nitrite feed inlet, a ferrous chloride feed inlet, a waste hydrochloric acid mixed liquid inlet, and a first oxygen inlet;
• a liquid outlet end of the first mixing pipeline is connected to the second reaction pipeline, and the second reaction pipeline is provided with a second sodium nitrite feed inlet and a second oxygen inlet;
• a liquid outlet end of the second reaction pipeline is connected to the third reaction pipeline, and a top of the third reaction pipeline is provided with a third oxygen inlet and a polymerizing agent feed inlet;
• the first mixing pipeline, the second reaction pipeline and the third reaction pipeline are each provided with a circulating spray device, and the circulating spray device comprises a reflux pump, a reflux pipeline and an atomizer, the atomizer comprises an atomizing pipe, the atomizing pipe is arranged horizontally and the atomizing pipe has an atomizing nozzle arranged upwardly;
• a horizontally arranged chemical filler plate for promoting gas-liquid contact is arranged below the atomizing pipe;
• the third reaction pipeline is further connected to the concentration device, and the concentration device is provided for an evaporation and a concentration of a polyferric chloride liquid;
• the concentration device comprises a steam chamber and a plurality of screw conveyors;
• cylinders of the plurality of screw conveyors are located inside the steam chamber, and a motor of each screw conveyor of the plurality of screw conveyors is located outside the steam chamber;
• the plurality of screw conveyors are arranged horizontally and at a same height, a liquid inlet and a liquid outlet of each two adjacent screw conveyors of the plurality of screw conveyors are connected head-to-tail, each cylinder of the each screw conveyor is provided with an interlayer, the interlayer is provided with a thermal conductive oil pipeline, and the each cylinder is further provided with a steam release port;
• and the concentration device is further connected to the drying device, and the drying device is provided for drying a concentrated solution.