Dirty water heat exchanger
A heat exchanger is described for use with a burner which produces hot gases and consists of: a cylindrical furnace duct having a first end connected to the burner for receipt of the hot gases and an open second end, the furnace duct defining a heater chamber therein; the furnace duct including a spiral liquid heating path surrounding at least a part of the heater chamber, the spiral path having a liquid inlet and a liquid outlet; an exhaust tube spaced apart from and surrounding at least a portion of the length of the furnace duct to define an exhaust gap therebetween, the exhaust trube having first and second ends, the second exhaust tube end being closed and surrounding the second furnace end to direct hot gases from the heater chamber, past the furnace duct second end and into the exhaust gap, the first exhaust tube end having an exhaust gas outlet, whereby the hot gases make a double pass and the heated liquid makes a single pass through the heat exchanger; means for mounting the furnace duct and the exhaust tube to one another, the mounting means securing the furnace duct to the exhaust tube at no more than one axial position to accommodate differential expansion between the furnace duct and the exhaust tube; a stationary mount secured to the first furnace duct end and a sliding support secured to the second exhaust tube end to accommodate differential axial expansion and contraction of the heat exchanger; and a slip joint mounting means allowing relative axial movement between the furnace duct and the exhaust tube, including radially oriented and axially extending spacer plates secured to one of the furnace duct and exhaust tube; and means for supporting the heat exchanger in a chosen position.
- Assignee:
- NOV; EDB-86-120625; NOV-85-013662
- Patent Number(s):
- US 4584969
- OSTI ID:
- 5718598
- Country of Publication:
- United States
- Language:
- English
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