Heat exchanger apparatus for converting a shell-side liquid into a vapor

A heat exchanger apparatus for converting a shell-side liquid to a vapor comprising:

• a shell having, an inner surface forming a cavity, the shell comprising, an inlet for introducing the shell-side liquid into the cavity and an outlet located in a top portion of the shell for allowing the vapor to exit the cavity, wherein the inlet is positioned on the shell to introduce the shell-side liquid into the annular space;
• a drip tray positioned in the cavity between the outlet and the liquid level;
• a first moisture separator positioned within the outlet;
• and a second moisture separator positioned in the cavity between the drip tray and the outlet;
• a tube bundle comprising a plurality of tubes for carrying a tube-side fluid located in the cavity and having a longitudinal axis;
• a shroud circumferentially surrounding the tube bundle and positioned between the tube bundle and the inner surface of the shell so that an annular space exists between the shroud and the inner surface of the shell;
• an opening in a bottom portion of the shroud that forms a passageway between the annular space and the tube bundle;
• an opening in a top portion of the shroud that forms a passage way between the annular space and the tube bundle;
• and
• a means for maintaining, a level of the liquid within the shell at a height above the shroud and the tube bundle and below the outlet.

A heat exchanger apparatus for converting a shell-side liquid to a vapor comprising:

• a shell having a cavity, the shell comprising an inlet for introducing the shell-side liquid into the cavity and an outlet for allowing the vapor to exit the cavity;
• a tube bundle positioned in the cavity and comprising a plurality of tubes for carrying a hot tube-side fluid;
• a thermal insulating barrier positioned between the tube bundle and the shell so that a space exists between the thermal insulating barrier and the shell, an opening in a bottom portion of the thermal insulating barrier that forms a passageway between the space and the tube bundle, an opening in a top portion of the thermal insulating barrier that forms a passageway between the space and the tube bundle;
• wherein heat emanating from the tube bundle causes a natural cyclical thermosiphon flow of the shell-side liquid within the cavity;
• and further comprising:
• the inlet positioned on the shell to introduce the shell-side liquid into the space;
• the outlet is located in a top portion of the shell;
• means for maintaining a level of the shell-side liquid within the cavity that submerges the thermal insulating barrier and the tube bundle;
• a drip tray positioned in the cavity between the outlet and the liquid level;
• a first moisture separator positioned within the outlet;
• and
• a second moisture separator positioned in the cavity between the drip tray and the outlet.