公开(公告)号：US3603101A

公开(公告)日：1971-09-07

申请号：US3603101D

申请日：1969-06-24

Applicant: SIVALLS TANKS INC

Inventor： SULLIVAN LAWRENCE J

IPC: F17C7/00 ,  F17C9/02

CPC classification number: F17C7/00 ,  F17C2201/0138 ,  F17C2227/0302 ,  F17C2227/0337

Abstract: The heater includes a vessel containing a heat transfer fluid and a fire tube located adjacent the bottom to heat the heat transfer fluid. The fluid to be heated flows through a coil located in the vessel above the fire tube but submerged in the heat transfer fluid. The coil encircles two void boxes that occupy a substantial portion of the space in the vessel and reduce the volume of heat transfer fluid required to fill the vessel to a level above the boxes and the coil. The void boxes are spaced apart and positioned relative to the fire tube to cause the heat transfer fluid to flow upwardly between the boxes and downwardly past the coil between the boxes and the walls of the vessel due to the heat convection currents produced by the thermosyphonic effect. When the fluid being heated is a gas and the pressure of the gas is to be reduced, a choke is located in the coil adjacent its outlet to reduce the pressure after the gas has been heated. This reduces the condensation of liquids and the possibility of their freezing due to the reduction in temperature resulting from the pressure drop across the choke.