After cleaning, the heat exchanger should be rinsed carefully with clean water. A solution of 1-2% sodium hydroxide (NaOH) or sodium bicarbonate (NaHCO 3) before the last rinse ensures that all acid is neutralized. One way to get an indication of the appropriate rinse time is to test the pH of the liquid at the outlet from the heat exchanger.
Dec 12, 2010 · Acid cleaning is only recommended if you have a lot of trouble getting the debris out of the plate heat exchanger. Some chemicals that can be used are nitric acid, citric acid, or phosphoric acid. Make sure you protect your eyes from splash back when cleaning with any type of acid. Wear protective goggles, and gloves to protect your hands. Cleaning Scale from a Heat Exchanger Chardon LabsSep 21, 2017 · Check the pH every five minutes. Add additional acid if the pH increases to greater than 3. Repeat step 8 until the pH remains between 2 and 3 for 30 minutes. The heat exchanger is now clean. Neutralize the cleaning solution to a pH of 5 with BD-6 by adding it to the tank and circulating the mixture.
Graphite block heat exchangers. Graphite block heat exchangers are adapted to the heating, cooling, evaporation, condensation and absorption of highly corrosive liquid chemicals. This design is one of the most versatile type of impervious graphite heat exchangers. Rows of holes are drilled through graphite blocks both horizontally and vertically to form the process and service channels. How to clean a plate heat exchanger - DFCNov 26, 2018 · Before pickling, firstly, flush the heat exchanger so that there are no impurities, such as mud and scale, inside the heat exchanger, which can improve the pickling effect and reduce the acid consumption. 2. The heat exchanger should be immersed in the acid solution for two hours, and then continuously circulated for three hours - four hours, during which the two sides should be alternately
Plate Heat Exchangers- Compact, efficient plate type heat exchangers and air-oil coolers designed for a long trouble free operation & low life-cycle cost. Provides complete range of Gasketed plate. Acid Resistant Heat Exchangers Ultramet CPTCorrosion resistant plate and frame heat exchangers are a compact, highly efficient and flexible design that can be made extremely acid and corrosion resistant with Ultramet CPTs tantalum surface technology. These designs are ideal for acid interchangers or when a flexible design is needed for varying heating/cooling requirements.
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