Brazed plate heat exchangers differ significantly from conventional plate heat exchangers
(usually referred to as removable plate heat exchangers) in structure, manufacturing process, and application.
The main differences are as follows:
1. Structural Design
Brazed plate heat exchangers are manufactured using a single-piece structure,
with stainless steel plates permanently welded together using high-temperature brazing
(copper or nickel-based brazing filler metal). They lack gaskets or a frame structure.
They are smaller, lighter, and feature a denser plate corrugation design,
resulting in higher pressure resistance (up to 30 bar).
Conventional removable plate heat exchangers are modular, consisting of individual plates,
rubber gaskets, and a metal frame, secured by bolts. The plates and gaskets can be replaced individually,
but they are larger and have a lower pressure resistance (typically ≤16 bar).
2. Manufacturing Process
Brazed plate heat exchangers are brazed at high temperatures in a vacuum brazing furnace,
resulting in a rigid, non-removable structure with no leaks (except at the inlet and outlet).
Removable plate heat exchangers rely on gaskets for sealing,
which require regular inspection or replacement to prevent leaks.
3. Application Scenarios
Brazed plate heat exchangers are used in high-pressure/high-purity media environments,
such as refrigeration (air conditioning, heat pumps), petrochemicals, and marine applications.
Detachable plate heat exchangers are used in industries such as food and beverage, HVAC,
and pharmaceuticals, where frequent cleaning or media replacement is required.
4. Cost and Lifespan
Brazed plate heat exchangers have a higher initial cost but a long lifespan (no gasket aging issues),
making them suitable for long-term, stable operation.
Detachable plate heat exchangers are suitable for applications where the media is prone to scaling,
frequent cleaning is required, or operating conditions are highly variable.
