Welded shell-and-plate heat exchangers combine all the advantages of plate and shell-and-tube heat exchangers and are reliable, compact devices without seals.
They are characterized by a high coefficient of heat transfer and good resistance to high temperatures (up to 900 ° C) and pressures (up to 140 bar).
Design and operation principle of welded shell-and-plate heat exchangers:
The core of the shell-and-plate heat exchanger is a completely welded plate package placed in the outer casing. Plate first welded together in ports, and then along the perimeter in a package, which is then placed in a cylindrical casing.
One medium enters and exits through the connecting tubes of the welded plate package. These nozzles are welded into the cover of the casing (flow on the side of the plates).
The other medium enters through the connecting pipe located on the cylindrical surface of the casing, directed to the channels between the plates by means of peripheral metal guides and exits through the outlet pipe (flow along the casing side).
The design can be fully welded or in some cases, with a single-pass version on the side of the plates, with a removable cover, which allows you to remove the package of plates for inspection and cleaning. In addition, a compact design is possible - in this case the inlet and outlet nozzle of the casing are located on the front cover of the heat exchanger.
Flow movement can be realized by counter-flow, straight-flow and cross-flow principle. If necessary (small temperature differences between heat carriers), all-welded heat exchangers can be manufactured in multi-pass version, both on the side of the plates and on the side of the casing. On the side of the casing, the passes are formed by means of special separating and guiding elements.
General operational parameters:
|
Maximum power |
up to 100 MW |
|
Operating temperature |
from -200 ° C to 600 ° C |
|
Maximum acceptable temperature |
up to 900 °C |
|
Operating pressure |
16, 25, 40, 100 bar |
|
Maximum allowable pressure |
up to 140 bar |
Main fields of application of shell-and-plate heat exchangers in chemical and petrochemical industry; in refrigeration engineering (cascades); in heat power engineering (steam condensers).
Applicable media: