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Combined with the background related to electrochemical protection of heat exchangers mentioned previously, the following are typical application cases of anode protection in heat exchangers in different scenarios.: Case study of anodically protected acid cooler for sulfur acid production. A 200kt/a pyrite acid production plant uses an anode-protected acid cooler made of 316L stainless steel to cool the high-temperature concentrated sulfuric acid discharged from the absorption tower. After 14 years of continuous operation, there are still no obvious corrosion marks on the tube surface. It can be upgraded to a 250kt/a sulfur acid production system in the future. The equipment life of some similar units can even be extended to more than 20 years. Case of Phosphoric Acid Concentration Heat Exchanger in a Fertilizer Plant In the phosphoric acid concentration process of a fertilizer plant, the 316L stainless steel heat exchanger failed due to strong corrosion in just 6 months without anode protection. After applying anode protection, the equipment life was directly extended to more than 5 years, and the corrosion rate was significantly reduced. Canadian CIL tubular sulfuric acid cooler case. This equipment uses 316L stainless steel tube bundles, 304L stainless steel shells, and HastelloyC alloy auxiliary cathodes. It is used to cool 93% sulfuric acid at 63°C and 99% sulfuric acid at 110°C. The corrosion rate of stainless steel reaches 5.08~10.16mm/a when not protected, and drops to 25.4μm/a after anode protection is implemented. It replaces the traditional cast iron pipe cooler and greatly reduces the maintenance workload. Domestic Tianhua Institute anode protection concentrated sulfuric acid heat exchanger case study This series of products is suitable for various scenarios such as ordinary working conditions, high temperatures, high chloride ions, and high acid concentration in sulfuric acid production. It is widely used in the metallurgy, petrochemical, and fertilizer industries. Through precise anode potential control, the equipment can operate stably for a long time in a highly corrosive environment, greatly reducing the risk of leakage and shutdown. Case study of 316 stainless steel spiral heat exchanger. This equipment is used to cool 98% concentrated sulfuric acid below 240°C. It is equipped with a filament cathode and a special reference electrode. After anodic protection, the corrosion rate is controlled at 25.4μm/a. There is no obvious corrosion damage in the long-term operation of the equipment.