Helium heated bayonet tube steam generator
AssigneeFoster Wheeler Energy Corporation
InventorRobert O. Barratt
Life of this patent
Estimating the term…
Abstract
Water is heated to steam in bayonet tubes and the steam is superheated in bayonet tubes which are heated by helium and which extend from a single tube sheet in which there are no excessively large temperature gradients. Feed water enters the inner tube of a bayonet tube assembly so that it is heated in the annulus between the inner tube and its associated outer tube and then flows into the annular space between the inner and outer tube of a second bayonet tube assembly so that it is heated to steam to leave by the inner tube of the second bayonet tube assembly to then flow into the annular space between the inner and outer tubes of a third bayonet tube assembly to be superheated and leave the third bayonet assembly through the inner tube thereof.
Claims11
A helium heated steam generator comprising:
- an outer shell;
- a helium intake in said outer shell;
- a helium exhaust in said outer shell;
- a main tube sheet in said outer shell;
- a plurality of economizer bayonet tube assemblies extending upward from said main tube sheet;
- a plurality of evaporator bayonet tube assemblies extending upward from said main tube sheet;
- a plurality of superheater bayonet tube assemblies extending upward from said main tube sheet;
- each of said bayonet tube assemblies having an inner tube and a coaxial outer tube of larger diameter, said outer tubes having closed upper ends and being connected with said main tube sheet, said inner tubes extending below said main tube sheet;
- a feed water inlet for supplying fluid to said economizer bayonet tube assemblies;
- first conduit means permitting communication between said economizer bayonet tube assemblies and said evaporator bayonet tube assemblies;
- second conduit means permitting steam leaving said evaporator bayonet tube assemblies to flow into the annular space between the inner and outer tubes of said superheater bayonet tube assemblies;
- and
- a steam outlet through said shell connected with the inner tubes of said superheater bayonet tube assemblies;
- whereby when hot helium gas is flowed through said helium intake over said outer tubes and out of said helium exhaust, and feedwater is flowed through said feedwater inlet, and said economizer bayonet tube assemblies to said evaporator bayonet tube assemblies and steam flows from said evaporator bayonet tube assemblies through said superheater bayonet tube assemblies and through said steam outlet, steam will be superheated in said superheater bayonet tube assembly while flowing upward in the space between said outer and inner tube of said superheater bayonet tube assemblies and leave said superheater bayonet tube assemblies by said inner tubes of said superheater bayonet tube assemblies.
A helium heated steam generator comprising:
- an outer shell;
- a helium intake in said outer shell;
- a helium exhaust in said outer shell;
- a main tube sheet extending horizontally within said outer shell;
- a plurality of evaporator bayonet tube assemblies extending upward from said main tube sheet;
- a plurality of superheater bayonet tube assemblies extending upward from said main tube sheet;
- each of said bayonet tube assemblies having an inner tube and a coaxial outer tube of larger diameter, said outer tubes each having a closed upper end and being connected adjacent the lower end thereof with said main tube sheet, each of said inner tubes extending below said main tube sheet;
- means for supplying water to the annular spaces between the inner and outer tubes of said evaporator bayonet tube assemblies so that said water will flow upward to be transformed into steam when hot helium gas from said helium intake is flowing over said evaporator bayonet tube assemblies;
- means for flowing steam leaving the bottoms of said inner tubes of said evaporator bayonet tube assemblies to the spaces between said inner and outer tubes of said superheater bayonet tube assemblies so that the steam from said evaporator bayonet tube assemblies will flow upward in the annular spaces between the inner and outer tubes of said superheater bayonet tube assemblies to be superheated by heat supplied by said helium gas flowing over said superheater bayonet tube assemblies;
- and
- means to flow the superheated steam leaving the lower ends of said inner tubes of said superheater bayonet tube assemblies out of said shell.
Dependencies are inferred from the claim text.