초록 ▼

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 ele

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.

대표청구항 ▼

1. A boiler comprising a pressure vessel having a tube and shell heat exchanger comprising: a. a tube bundle inside a shell, said tube bundle further comprising a single inlet end adjacent to an exterior surface of said shell and a single outlet end and said tube bundle further comprises a multi-pas

1. A boiler comprising a pressure vessel having a tube and shell heat exchanger comprising: a. a tube bundle inside a shell, said tube bundle further comprising a single inlet end adjacent to an exterior surface of said shell and a single outlet end and said tube bundle further comprises a multi-pass tube bundle formed from a single tube; b. a burner connected directly to said inlet end of said tube bundle, said burner adapted to project a flame directly into said inlet end of said tube bundle; c. means for inducing a draft of ambient air through said tube bundle; and d. means for inducing a flow of liquid through said shell.