Square All-Welded Heat Exchanger

Design parameters

Flow range: 1–2000 m³/h
Working pressure: vacuum to 8.2 MPa
Operating temperature: -195 to 300°C
Interface size: DN25 to DN300; connection types include welding, flanged, and threaded connections.
Corrosion Resistance: Welded sealing without rubber gaskets, a wide selection of metals and alloys, exceptional corrosion resistance, and an extended service life.

Design Features

The square all-welded heat exchanger combines the advantages of plate heat exchangers and shell-and-tube heat exchangers, retaining the traditional plate heat exchanger’s high efficiency, compact structure, high-temperature resistance, excellent sealing performance, and reliable safety, while also enabling operation under higher pressure and temperature conditions.
It is suitable for applications such as steam condensation and liquid–liquid heat exchange, and is particularly well‑suited to the heat‑transfer requirements of special media in industries including power generation, petrochemicals, coking, pharmaceuticals, metallurgy, refrigeration, and pulp and paper. Through a carefully designed process configuration, it ensures an optimal balance between heat‑transfer efficiency and pressure‑drop losses. The shell features a six‑panel detachable structure, enabling both mechanical and chemical cleaning of the internal components.

Structural features

• High heat transfer efficiency
  The plates are designed with a herringbone structure, resulting in high heat transfer efficiency.
• Low fluid retention
  The high turbulence on the plate surfaces and within the flow channels results in reduced fouling and minimal liquid holdup.
• Reduce material costs
  By designing the edge structure of the plates, all surfaces in contact with the process fluids are made of the same material as the plates themselves. This approach not only accommodates a wide range of fluid‑handling requirements but also significantly reduces material costs and lowers initial capital expenditures.
• Removable and washable
  In the event of plate blockage, the square all-welded heat exchanger can have its peripheral cover plates removed for cleaning.
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Main structural types

1. Non-removable type

Structure: All plates are laser-welded into a single, non‑removable plate pack, with no gaskets.
Maintenance and cleaning: Chemical cleaning only.
Applicable media: media prone to scaling, containing particulates, corrosive, and operating under high temperature and high pressure.
Typical applications: high-pressure heating and condensation in power plants, petrochemical facilities, and chemical industries.

2. Detachable on one side

Structure: One side of the plate bundle is welded and sealed, while the other side (the side with the movable pressure plate) can be opened.
Maintenance and Cleaning: The removable side can be inspected and mechanically cleaned, while the welded side can only be chemically cleaned.
Applicable medium: One side is a scaling‑prone or corrosive medium, while the other side is a relatively clean medium.
Typical applications: district heating, certain chemical processes (process fluid on one side, cooling water on the other)

3. Double-sided and detachable

Structure: The plate pack can be opened from both sides, and the entire plate bundle can be easily withdrawn.
Maintenance and Cleaning: After the plate bundle is removed, both sides can be mechanically cleaned and inspected.
Applicable medium: Situations where both sides of the medium are prone to scaling or require frequent cleaning and maintenance.
Typical applications: papermaking, food processing, pharmaceuticals, and the metallurgical industry (where media tend to scale).