Hydrogen and nitrogen circulation and self-cleaning system in hydrogen peroxide production device

The invention discloses a hydrogen and nitrogen circulation and self-cleaning system in a hydrogen peroxide production device, which comprises a hydrogenation tower, a hydrogenated tail gas cooler, a hydrogenated tail gas condensate metering tank, a hydrogen and nitrogen circulation compressor, a hydrogen and nitrogen filter and an aromatic hydrocarbon recovery device. According to the hydrogen and nitrogen recycling system, hydrogen and nitrogen are used as raw materials and compressed through the hydrogen and nitrogen recycling compressor, and the recycled hydrogen and nitrogen are filtered through the hydrogen and nitrogen filter and then mixed with the raw material hydrogen to enter the hydrogenation tower together. In addition, by-product degradation products covering the surface of the catalyst in the hydrogenation tower can be flushed through circulating nitrogen, the surface activity of the catalyst is effectively recovered, and therefore the continuous self-cleaning effect is achieved, the catalytic