公开(公告)号：US3570458A

公开(公告)日：1971-03-16

申请号：US3570458D

申请日：1969-05-09

申请人： MITSUBISHI HEAVY IND LTD ,  MITSUBISHI PETROCHEMICAL CO

发明人： SATO TAKEHIKO ,  KONDO TAKAO ,  OMORI TOSHIJI ,  ITO HISAO ,  TERAO MASARU

IPC分类号： F22B20060101 ,  F22B1/18 ,  F22B9/04 ,  F22B25/00 ,  F28D7/02 ,  F22B1/02 ,  F28F13/00

CPC分类号： F28D7/024 ,  F22B1/1884 ,  F22B9/04 ,  F22B25/00

摘要： A heat exchanger such as a boiler comprises a liquid section having a wall with a plurality of sleeve pipes extending therethrough. The fire tubes for conducting high-temperature gases extend through the respective sleeve pipes and upwardly in the liquid section without being directly coupled to the wall of the liquid section. The fire tubes extend in the form of a gentle curve such as a spiral through the liquid section and extend outwardly through an upper wall of the liquid section through respective additional sleeve elements and connect at their upper ends into an outlet gas chamber. Liquid is circulated by natural circulation from the liquid section through an exterior duct to the hollow sleeve elements and around the fire tubes and back upwardly into the liquid section. The gently curved form of the fire tubes inside the liquid section and their free mounting at their passage through the sleeve elements provides a construction which is capable of withstanding the high thermal stresses which are present in such boilers.