230 tube, 184ft2(17,1m2)surface area polyester cooler for fiber production

111 tube polyester cooler with 102ft2(9.45m2) surface area
Devolatilization Preheaters, each containing 1,890 tubes and providing 3,638ft2(338m2) surface area

Typical equipment configuration for preheating polystyrene prior to final devolatilization.

Samhwa specializes in building heat exchangers which incorporate static mixing elements and especially suited for heating and cooling highly viscous fluids. The mixing elements continuously create a new Interface between the product and tube wall, thereby producing a uniform heat history in the Product. This arrangement produces a heat transfer rate that is three to seven times that of conventional heat exchangers. These heat exchangers are very compact, producing a short residence time.
Typical Applications
' Cooling polyester
' Preheating polystyrene prior to devolatilization
' Maintaining constant hot oil temperature in recirculation loops
' Cooling hot melt adhesive products immediately before packaging
' Heating viscous food product such as taffy, glucose products, corn starch
' Healing proprietary sealants in production of self-sealing automobile tires
' Cooling precursors used in carbon fiber production
' Cooling polystyrene foam in extrusion processes
' Maintaining temperature uniformity of cellulose acetate in filter tow production
' Removing heat generated in exothermic reactive processes

Standard Specifications
Heat exchangers are custom designed for each application.
' Materials: Carbon steel, stainless steel, Hastelloy, Inconel, etc.
' Pressure: :Exceeding 350 bar (5,075 psi)
' Viscosities: Exceeding 20,000 Pas (20,000,000 cp)
' Certifications: ASME, DIN, Chinese Safety Quality License, Others

Benefits / Advantages
' Increases heat transfer coefficients three to seven times that of traditional open tube designs
' Low pressure drop for high viscosity materials
' Short and uniform residence time
' Smooth shape and edge sealing of mixer elements allows no dead spaces for product to hang up or degrade
' Can be used for materials with low to high viscosities
' No moving parts, therefore no maintenance
' Can process highly corrosive materials upon various options of materials to be chosen ' Uniform temperature-no hot spots

New Design Promises Substantial Benefits

Samhwa has developed a new design (patent pending) of heat exchanger that is generating considerable interest among polymer producers. It uses helical mixing elements as before, but they are inserted into coils rather than tubes (see sample photo at right). The coil/mixer assemblies are arranged in a vessel similarly to a shell and tube heat exchangers design.
However, a key difference is that the heating or cooling fluid flows through the coils while the product flows in the open space previously filled by the heat/cooling agent. The result is a high heat transfer unit that requires much less flange wall thickness for a given pressure. Weight is substantially reduced, thereby reducing unit and installation costs.


' Lower pressure drop than other static mixer heat exchangers
' Weight is reduced from one-half to two-thirds
' Higher heat transfer
' Less cost
' Stronger than normal shell and tube type

The new design is expected to be suitable for any type of heat
exchange application. However, it will be ideal for high pressure
polymer processing applications, such as for polyester.