Welded-Plate Exchangers

Other types of plate-and-frame heat exchangers are double-wall-plate exchangers, welded-plate exchangers, wide-gap-plate exchangers, and brazed-plate exchangers. Each type is briefly described below. 

B. Omberg and P. Crook, F Neir NickelFlloir and a New Semi-Welded Plate Heat Exchanger The State of theFrtfor Tomorrow s Fcid Coolers, Sulphur 94 (British Sulphur Conference), Tampa, Fla., Nov. 1994. 

There are two major types gasketed and welded-plate heat exchangers. Each shall be discussed individually. 

A spiral-plate exchanger is fabricated from two relatively long strips of plate, which are spaced apart and wound around an open, split center to form a pair of concentric spiral passages. Spacing is maintained uniformly along the length of the spiral by spacer studs welded to the plate. 

Spiral-plate exchangers are fabricated from any material that can be cold worked and welded. Materials commonly used include carbo steel, stainless steel, nickel and nickel alloys, titanium, Hastelloys, and copper alloys. Baked phenolic-resin coatings are sometimes applied. Electrodes can also be wound into the assembly to anodically protect surfaces against corrosion. 

Figure 10-7C. The patented COMPABLOG welded plate heat exchanger is technologically advanced, compact, and efficient. The fully welded design (but totally accessible on both sides) combines the best in performance, safety maintenance, and capital/maintenance costs. (Used by permission Vicarb Inc., Canada, publication VNT-3110 1997.)...

The shell of a heat exchanger is commonly made of carbon steel and standard pipes are used for the smaller sizes and rolled welded plate for the larger sizes (say 0.4-1.0 m). 

G. Effluent exchanger channel welds, plate, and heat-affected zone, isolated areas damaged postweld heat treatment. 

Figure 7 Various welded plate heat exchangers.

Aluminum plate-hn heat exchangers are often used as condensers in distillation and separation processes, but they require nonfouling and noncorrosive fluids. In the chemical industry, stainless steel or welded-plate heat exchangers have been used as top condensers of distillation columns, because they can be either directly installed inside the column or closely integrated outside (Figure 39),... 

Welded plate heat exchanger (courtesy of Barriquand)... 

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