Aluminum heat exchanger material

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Galvanic or impressed current anodes are used to protect these components. The anode material is determined by the electrolyte zinc and aluminum for seawater, magnesium for freshwater circuits. Platinized titanium is used for the anode material in impressed current protection. Potential-regulating systems working independently of each other should be used for the inlet and outlet feeds of heat exchangers on account of the different temperature behavior. The protection current densities depend on the material and the medium. 

Oil and hydrocarbon leaks that return with the condensate coat heat-exchange surfaces and cause FW system fouling and deposit binding. These materials must be removed or they will reenter the boiler to produce nonwettable boiler surfaces, and create serious problems. Oil in condensate should be removed by the use of an inline pre-coat filter. The pre-coating should be either aluminum hydroxide ox ferric hydroxide becaue both these hydrous oxide gels have an affinity for oil. 

It will also be possible by relatively minor piping changes to convert the forward-feed evaporator to backward feed, which might be more favorable if the calcium sulfate scale problem can be solved. Except for tubes, pump shaft sleeves, impellers, etc., the plant will be built exclusively of steel and cast iron. Tube materials will be evaluated by tubing different evaporator effects and heat exchangers with steel, admiralty metal, aluminum brass, and 90/10 cupronickel. The copper alloy tubes will be used exclusively in the final condenser and in the few heat exchangers that are in contact with nondeaerated sea water. 

For higher-temperature applications or when aluminum is not acceptable, stainless steel (temperatures up to 700°C) or copper materials can be used. For very high temperatures (gas turbine heat recovery T > 1200°C), a ceramic plate-fin heat exchanger has also been developed (17) (Figure 16). 

Perforated, or matrix, heat exchangers are highly compact and consist of a stack of perforated plates made of high-thermal-conductivity material, such as copper or aluminum, alternating with spacers of low thermal conductivity, such as plastic or stainless steel. The pack of alternate low- and high-thermal-conductivity... 

The melt is hot enough to sublime (i.e., >178°C) the aluminum chloride out of the melt as it forms, and the product is continuously collected on a water-cooled, scraped-surface heat exchanger. Commercial alkylation reactions are the largest single use for anhydrous aluminum chloride, in particular the alkylation of benzene to ethylbenzene enroute to styrene (Chap. 19). Aluminum chloride made by this route is only slightly more expensive (at 1.80/kg) than aluminum because of the large molar quantity of relatively inexpensive chlorine (23c/kg) added to the relatively expensive aluminum (ca. 1.60/kg) [47]. Liquid (solution in water specific gravity 1.28) aluminum chloride is a by-product of the manufacture of the anhydrous material. The... 

The material used was 3003-0 aluminum alloy, 3.18 mm (0.125 in.) thick, cut into compact tension specimens as in Trebules s work [% Also, 5.6-mm (0.22-in.)-thick specimens prepared from material removed from a brazed heat exchange cap sheet were tested. The nominal yield strength and ultimate strength of 3003-0 aluminum are 41 MPa (6 ksi) and 110 MPa (16 ksi), respectively. 

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