Heat exchanger
AssigneeSulzer Brothers Limited
InventorGeorg Hirschle
Life of this patent
Estimating the term…
Abstract
The heat exchanger is constructed in various embodiments such that the crevice duct between the outermost coil of tubes and the jacket defining the crevice duct is maintained at a constant width during operation. In some embodiments, the outermost coil tubes is carried on the jacket to maintain a constant width of the crevice duct. In other embodiments, a separate set of cooling tubes in provided to maintain the jacket cool. In other embodiments, the amount of heat drawn off through the outermost coil of tubes is increased.
Claims20
A heat exchanger comprising
- a pressure vessel;
- a cylindrical gas flue in said pressure vessel for conveying a hot gas from an inlet zone to an outlet zone;
- a tube bunch within said gas flue for conveying a cooling medium therethrough in heat exchange relation with the flow of hot gas, said tube bunch having an outermost coil of tubes transverse to the gas flow and spaced from said gas flue to define an annular crevice duct of a dimension that, at the working temperature, the average temperature of the gas issuing from said crevice duct is substantially equal to the average temperature of the gas issuing from the remainder of said tube bunch;
- and
- means for maintaining the average heat flow through said outermost coil of tubes substantially equal to the average heat flow through the remaining tubes of said tube bunch during heating and radial expansion of said flue.
A heat exchanger for cooling hot gases comprising
- a pressure vessel having a gas inlet connection for receiving a flow of hot gas and a gas outlet for expelling the flow of gas;
- a cylindrical jacket disposed within said pressure vessel to form a gas flue therein for the passage of the flow of hot gas from said inlet connection to said gas outlet;
- a tube bunch coiled within said jacket for conveying a cooling medium therethrough in heat exchange relation with the flow of hot gas, said tube bunch having an outermost coil of tubes transverse to the gas flow and bounding an annular crevice duct of predetermined width with said jacket;
- and
- means for maintaining the average heat flow through said outermost coil of tubes substantially equal to the average heat flow through the remaining tubes of said tube bunch during heating and radial expansion of said jacket.
A heat exchanger for cooling a hot gas comprising
- a pressure vessel having a gas inlet connection for receiving a flow of hot gas and a gas outlet for expelling the flow of gas;
- a cylindrical jacket disposed within said pressure vessel to form a gas flue therein for passage of the flow of hot gas from said inlet connection to said gas outlet, said jacket having at least one slot extending longitudinally of said gas flue to permit heat expansion of said jacket while maintaining the diameter of said jacket;
- and
- a tube bunch within said gas flue for conveying a cooling medium therethrough in heat exchange relation with the flow of hot gas, said tube bunch having an outermost coil of tubes transverse to the gas flow and spaced from said gas flue to define an annular crevice duct of a dimension that, at the working temperature, the average temperature of the gas issuing from said crevice duct is substantially equal to the average temperature of the gas issuing from the remainder of said tube bunch.
Dependencies are inferred from the claim text.