Gas fired tube and shell heat exchanger

摘要

A gas fired tube and shell heat exchanger directs a flame directly into an inlet end of the tube bundle and the flame and exhaust are drawn through the tube bundle by an induced draft blower located in the exhaust stream outside of the shell. Liquid to be heated is pumped through the shell by an electric pump. In another preferred embodiment, a forced draft blower is placed on behind the burner to force air into the tube bundle. Control features prevent the burner from firing unless there is liquid flow through the shell.