Dual-purpose composite fertilizer and urea production device

The invention belongs to a production device capable of producing urea and a urea-based high-nitrogen composite fertilizer, in particular to a dual-purpose high-concentration urea-based composite fertilizer and urea production device which has simple structure and is easy to operate. The production device comprises a synthesizing tower which is sequentially connected with a medium-pressure decomposition separation system, a low-pressure decomposition separation system, a flash-evaporation separation concentration system, a steam heater, a urea solution pipeline inlet at the upper end of the steam heater, a steam separator, two steam separation concentration systems, a melting pump and a pelleting tower and the production device also comprises a batching system which is sequentially connected with a comprehensive belt, a dense-phase gas conveying system, a valve and a composite fertilizer batching feeding hole at the upper end of one steam separator. The invention has the advantages ofsimple structure, easy op