Heat exchange system and method of assembly
A method of constructing a coil wound heat exchange module and transporting and installing the coil wound heat exchange module at a plant site, such as an natural gas liquefaction plant. A module frame is constructed and attached to a heat exchanger shell prior to telescoping of a coil wound mandrel into the shell. The module frame includes a lug and two saddles that remain attached to the shell throughout the process and when the heat exchanger is operated. The lug and saddles are constructed and located to stabilize the shell during construction, telescoping and transport (when in a horizontal orientation), and when the shell is installed at the plant site (in a vertical orientation). The lugs and saddles are adapted to allow for thermal expansion and contraction of the shell when it is transitioned from ambient to operating temperature and vice versa.
1. A heat exchange module comprising:
a coil wound heat exchanger comprising a shell having an outer surface, a top end, and bottom end, a shell longitudinal axis, a shell length extending along the shell longitudinal axis from the top end to the bottom end, the shell length being a largest dimension of the shell;
a module frame comprising a plurality of columns connected by cross-members;
a lug that is rigidly attached to the shell and the module frame; and
a first saddle that is rigidly attached to the shell and is connected to the module frame by a plurality of first saddle joints, each of the plurality of first saddle joints being adapted to accommodate for thermal expansion and contraction of the shell by enabling the first saddle to move relative to the module frame in a direction that is parallel to the shell longitudinal axis.
2. The heat exchange module of claim 1 , wherein each of the first saddle joints is adapted to prevent movement of the first saddle relative to the module frame in directions that are not parallel to the shell longitudinal axis.
3. The heat exchange module of claim 1 , wherein each of the plurality of first saddle joints comprises a plurality of bolts extending through a plurality of plates, at least one of the plurality of plates having a plurality of slots that each engage at least one bolt.
4. The heat exchange module of claim 1 , wherein the first saddle is positioned between the lug and the top end and the bottom end of the shell.
5. The heat exchange module of claim 4 , additionally comprising a second saddle positioned between the lug and the other of the top end and the bottom end of the shell.
6. The heat exchange module of claim 1 , wherein the lug is positioned within 5% of a longitudinal center of mass of the shell.
7. The heat exchange module of claim 1 , wherein the first saddle is positioned within 5% of a midpoint between the lug and one of the top and bottom end of the shell.
8. The heat exchange module of claim 5 , wherein the second saddle is positioned within 5% of a midpoint between the lug and the other of the top and bottom end of the shell.
9. The heat exchange module of claim 1 , wherein the first saddle further comprises a first contoured plate at a first interface with the shell, the first contoured plate being complimentary in shape to the shell along the first interface.
10. The heat exchange module of claim 9 , wherein the first interface comprises at least one third of a circumference of the shell.
11. The heat exchange module of claim 5 , wherein the second saddle further comprises a second contoured plate at a second interface with the shell, the second contoured plate being complimentary in shape to the shell along the second interface.
12. The heat exchange module of claim 11 , wherein the second interface comprises at least one third of a circumference of the shell.
13. The heat exchange module of claim 1 , wherein the first saddle further comprises a plurality of ribs, each of the plurality of ribs being oriented perpendicular to the plurality of first saddle joints and extending linearly between the heat exchange module and the plurality of first saddle joints.
14. The heat exchange module of claim 5 , wherein the second saddle further comprises a plurality of ribs, each of the plurality of ribs being oriented perpendicular to the plurality of second saddle joints and extending linearly between the heat exchange module and the plurality of second saddle joints.
15. The heat exchange module of claim 5 , wherein the first saddle, the second saddle, and the lug each encircle the shell.
16. The heat exchange module of claim 1 , further comprising at least one walkway comprising a walking platform and a railing, each of the at least one walkway being rigidly attached to the module frame and having no attachment points with the shell.
17. A plant for liquefying a hydrocarbon feed gas, the plant comprising:
a feed conduit for the hydrocarbon feed gas;
a main heat exchanger in fluid flow communication with the feed conduit;
a mixed refrigerant compression subsystem operationally configured to provide a refrigeration duty to the main heat exchanger;
wherein the main heat exchanger and the refrigerant compression subsystem are operationally configured to liquefy and subcool the hydrocarbon feed gas to form a liquefied product stream; and
wherein the main heat exchanger comprises at least one heat exchange module having the structure of the heat exchange module of claim 1 .
18. The plant of claim 17 , wherein the at least one heat exchange module comprises a first heat exchange module and a second heat exchange module, a module frame of the first heat exchange module being affixed to and vertically aligned with a module frame of the second heat exchange module.
19. The plant of claim 17 , wherein the shell of the first heat exchange module is in fluid flow communication with the shell of the second heat exchange module.
20. The heat exchange module of claim 5 , wherein the second saddle is rigidly attached to the shell and is connected to the module frame by a plurality of second saddle joints, each of the plurality of second saddle joints being adapted to allow for thermal expansion and contraction of the shell by enabling the second saddle to move relative to the module frame in a direction that is parallel to the longitudinal axis of the shell.
21. The heat exchange module of claim 20 , wherein each of the second saddle joints is adapted to prevent movement of the second saddle relative to the module frame in directions that are not parallel to the shell longitudinal axis.