Ultrahigh-temperature and high-pressure bayonet tube heat exchanger

The utility model relates to the field of heat exchangers, in particular to an ultra-high-temperature and high-pressure bayonet tube heat exchanger, and aims to develop heat exchange equipment which is simple, efficient, cost-saving and capable of running safely and stably. According to the scheme, an end cover, a tube box, a tube plate and a shell are sequentially connected from left to right, and an outlet header is arranged in the tube box; an outlet pipe of the outlet collecting box is arranged in a pipe side outlet in the top of the pipe box, a pipe side inlet is formed in the bottom of the pipe box, a plurality of bayonet pipe inner pipes connected with the outlet collecting box are arranged in bayonet pipe outer pipes respectively, gaps are reserved between the bayonet pipe outer pipes and the bayonet pipe inner pipes, and the bayonet pipe outer pipes are installed on the pipe plate in an inserted mode. The bayonet pipe outer pipes are communicated with the space in the pipe box, the right ends of the