Static mixer for urea catalytic hydrolysis

Disclosed is a static mixer for urea catalytic hydrolysis. The static mixer comprises a mixer inner barrel, a mixer outer barrel, a spiral diversion section, a mixing chamber and a mixer outlet section, the mixer inner barrel sequentially comprises a diluted air inlet straight section, an inner barrel air outgoing section and an inner barrel closed section along an airflow direction, the spiral diversion section is arranged between the inner barrel air outgoing section and the mixing chamber, multiple rows of air outgoing holes are axially formed in the wall face of the inner barrel air outgoing section, and an ammonia inlet is formed in the wall, close to the front end of the inner barrel air outgoing section, of the mixer outer barrel. The static mixer has the advantages of simple structure, small pressure decrease and supportiveness of sufficient mixing of ammonia and air; the inner barrel and the outer barrel are connected through a flange, so that the static mixer is convenient to demount, thereby being