Equipment and method for ozone circulation fumigation in grain depot

An equipment for ozone circulation fumigation in a grain depot, comprising a grain storage cavity, an air intake unit, a circulation unit, and a fixed unit, wherein the air intake unit is connected to the grain depot through the fixed unit, the circulation unit is located on a side of the grain depot away from the air intake unit, the circulation unit is connected to the air intake unit through a reflux pipe, and the reflux pipe is equipped with an ozone concentration sensor;

• a transverse diffusion tube of the air intake unit is connected with the grain storage cavity, a ventilation partition is provided in the grain storage cavity, a plurality of air vents are provided on the ventilation partition, and a backflow channel is formed between the ventilation partition and a side wall of the grain depot;
• a top of the grain storage cavity is equipped with a sealing film to avoid ozone in the grain storage cavity overflowing upward to a top of the grain depot, resulting in a waste of the ozone;
• a plurality of installation holes are evenly arranged on the transverse diffusion tube of the air intake unit, a vertical diffusion tube is connected to the transverse diffusion tube through the plurality of installation holes, and the vertical diffusion tube is equipped with a plurality of ventilation holes connected to the grain storage cavity;
• the ventilation partition is a multi-layer porous steel plate, and the vertical diffusion tube is a porous network tube;
• an ozone generator of the air intake unit is connected to a circulation fan through a first valve, the circulation fan is connected to an air intake pipe through a second valve, and the air intake pipe is connected to the transverse diffusion tube;
• a negative pressure fan of the circulation unit is located at the top of the grain storage cavity, a negative pressure air intake pipe of the negative pressure fan is connected with the backflow channel through a third valve, and a negative pressure outlet of the negative pressure fan is connected with the circulation fan through the reflux pipe;
• the backflow channel is connected to the grain storage cavity;
• and
• a fourth valve is arranged at intervals on the transverse diffusion tube.