Concentrated Sulfuric Acid Anodic Protection Cooler CD-AP-350 350m² 98.5% H₂SO₄

The Carpe Diem CD-AP-350 Anodic Protection Sulfuric Acid Cooler is a high-capacity industrial heat exchanger engineered specifically for cooling concentrated sulfuric acid in large-scale chemical processing plants. With a heat exchange area of 350 square meters and the ability to handle 98.5% H₂SO₄ at flow rates up to 500,000 kilograms per hour, this unit delivers exceptional thermal performance while maintaining the highest standards of corrosion resistance. The cooler employs advanced anodic protection technology to form a stable passive film on the stainless steel surfaces in contact with the acid, dramatically extending equipment service life and reducing maintenance downtime. Constructed with a 304L stainless steel shell and a 316L tube bundle featuring Φ19*2.0 mm tubes with 6500 mm effective length, the CD-AP-350 represents the optimal balance between capital cost and long-term operational reliability for concentrated acid cooling applications in sulfuric acid production plants, fertilizer complexes, and petrochemical refineries worldwide.

The anodic protection system continuously monitors and controls the electrochemical potential of the acid-wetted surfaces, maintaining the alloy in its passive region where corrosion rates are reduced to less than 0.05 millimeters per year. This active corrosion control mechanism makes the CD-AP-350 especially suited for handling high-concentration sulfuric acid at elevated temperatures up to 85 degrees Celsius, where conventional materials would experience rapid degradation. The unit is designed and fabricated in full compliance with ASME Section VIII Division 1 pressure vessel code and carries both ISO 9001 quality management certification and the ASME U Stamp, ensuring adherence to the most rigorous international fabrication and inspection standards. Every heat exchanger undergoes comprehensive hydrostatic testing, helium leak detection, and radiographic examination of all longitudinal and circumferential welds before shipment, providing our customers with complete confidence in the equipment integrity and long-term performance of their critical process assets.

• Advanced Anodic Protection System: Real-time potentiostatic control maintains the passive layer on 304L and 316L stainless steel surfaces, reducing corrosion rates to below 0.05 mm per year even when handling 98.5% concentrated sulfuric acid at elevated operating temperatures.
• Large Heat Exchange Area: The 350 square meter surface area enables efficient cooling of high-volume acid streams, with the capability to reduce acid temperature from 85 degrees Celsius inlet to 48 degrees Celsius outlet under rated flow conditions of 500,000 kilograms per hour.
• Dual-Grade Stainless Steel Construction: The 304L shell provides excellent structural strength and general corrosion resistance, while the 316L tube bundle offers superior pitting and crevice corrosion resistance in the more aggressive tube-side environment where localized attack risks are highest.
• Optimized Tube Geometry: The Φ19*2.0 mm tube specification with 6500 mm effective length maximizes the heat transfer coefficient while maintaining adequate mechanical strength to withstand differential thermal expansion between the shell and tube bundles during operation.
• Comprehensive Quality Testing: Every CD-AP-350 undergoes hydrostatic pressure testing at 1.5 times design pressure, helium mass spectrometer leak detection with sensitivity down to 1*10⁻⁶ Pa·m³/s, and 100 percent radiographic inspection of all shell and channel welds prior to dispatch.
• Flexible Flange Configuration: Standard ANSI B16.5 Class 150 flanges are provided on all process connections, with optional DIN 2576, JIS B2220, and GB/T 9119 flange standards available to meet diverse international piping specifications without the need for adapters.
• Industrial Process Integration: Multiple nozzle orientations and support saddle configurations are available to accommodate various plant layouts, with the unit designed for both horizontal and vertical installation orientations to suit space-constrained brownfield sites.

The CD-AP-350 anodic protection sulfuric acid cooler is extensively deployed in sulfur-burning sulfuric acid production plants where concentrated acid at 98.5 percent strength must be cooled from absorption tower discharge temperatures of approximately 85 degrees Celsius to storage-appropriate temperatures below 50 degrees Celsius before transfer to product storage tanks. In phosphate fertilizer manufacturing complexes, this cooler handles the intermediate cooling stage between the sulfuric acid dilution system and the phosphoric acid reactor feed circuit, maintaining precise acid temperature control essential for optimal phosphate rock digestion kinetics and gypsum crystal morphology control. The unit also serves in copper and nickel hydrometallurgical operations where large volumes of concentrated sulfuric acid are used as the primary leaching agent and must be continuously recirculated through cooling loops to maintain stable leach temperatures throughout extended campaign durations. Within petroleum refinery alkylation units, the CD-AP-350 provides reliable cooling for the sulfuric acid catalyst stream, ensuring the acid retains its catalytic activity by preventing thermal degradation that occurs when acid temperatures exceed critical thresholds during the exothermic alkylation reaction process. The cooler is equally suitable for titanium dioxide pigment production via the sulfate process, where concentrated sulfuric acid serves as the digestion medium for ilmenite ore and requires precise temperature management to control reaction rates and product quality parameters.

Each CD-AP-350 Anodic Protection Sulfuric Acid Cooler is shipped in naked packing with a robust welded steel protective frame that safeguards all nozzles, flanges, and the anodic protection electrode housings against impact damage during ocean and overland transportation. All process openings are sealed with blind flanges and desiccant breather ports to prevent moisture ingress and atmospheric contamination of the internal tube surfaces during transit and site storage periods. The anodic protection controller, reference electrodes, and cathode assemblies are separately crated in foam-lined export-grade wooden cases with humidity indicators and shock-watch labels to ensure electronics and precision components arrive in factory condition. Carpe Diem provides a comprehensive documentation package including material test certificates to EN 10204 Type 3.1 for all pressure-containing components, a complete as-built fabrication data book with weld maps and NDE reports, the ASME U Stamp certificate of authorization, and a detailed installation and commissioning manual with troubleshooting guides for the anodic protection system. Our after-sales engineering team is available for on-site commissioning supervision, operator training, and periodic performance audits to ensure the cooler maintains its design thermal duty and corrosion protection effectiveness throughout its operational life.