Low Pressure Drop Anodic Protection Sulfuric Acid Cooler CD-AP-400 400m² with

The Carpe Diem CD-AP-400 Anodic Protection Sulfuric Acid Cooler is a high-performance shell and tube heat exchanger specifically engineered for large-scale sulfuric acid production facilities requiring efficient thermal management. With a substantial 400m² heat exchange area and an advanced low pressure drop hydraulic design, this cooler achieves exceptional cooling performance while minimizing pumping energy consumption. The unit is designed to process 98.8% concentrated sulfuric acid at an inlet temperature of 92°C, reducing it to 58°C across a massive flow rate of 700,000 Kg/h. Constructed with a robust 304L stainless steel shell and a precision-engineered 316L stainless steel tube bundle (each tube measuring Φ25 × 2.5 × 6500mm), the CD-AP-400 delivers outstanding corrosion resistance and long-term operational reliability under the most demanding sulfuric acid service conditions. The integrated anodic protection system, featuring platinum-clad titanium anodes and Hastelloy C-276 cathodes, actively suppresses acid corrosion on all wetted surfaces, ensuring a service life that far exceeds conventional coolers without electrochemical protection.

• Optimized Low Pressure Drop Hydraulic Design: The tube-side and shell-side flow paths are engineered using computational fluid dynamics analysis to minimize pressure losses, reducing the required pumping power by up to 25% compared to conventional designs. This translates directly to lower operating costs and improved overall plant energy efficiency across the entire system duty cycle.
• Advanced Anodic Protection System: The integrated cathodic-anodic protection circuit continuously monitors and maintains a protective passive film on all acid-wetted stainless steel surfaces. Platinum-clad titanium anodes and Hastelloy C-276 cathodes provide uniform current distribution, effectively preventing active corrosion even at acid concentrations exceeding 98%.
• Premium 304L/316L Dual-Grade Construction: The shell side utilizes 304L stainless steel for excellent general corrosion resistance and cost-effectiveness, while the tube bundle is fabricated from 316L stainless steel with molybdenum addition for superior resistance to pitting and crevice corrosion in high-temperature concentrated sulfuric acid environments.
• High-Capacity Thermal Performance: With 400m² of effective heat exchange surface and a design that accommodates 700,000 Kg/h acid flow, the CD-AP-400 is purpose-built for large-capacity sulfuric acid production lines, drying towers, and absorption systems where maximum throughput cooling is essential.
• Precision Tube-to-Tubesheet Joints: Every tube-to-tubesheet connection undergoes strength welding followed by hydraulic expansion, creating a mechanically robust and leak-tight seal that withstands thermal cycling fatigue and prevents intermixing of acid and cooling water media.
• Full NDT Quality Verification: Each completed unit undergoes comprehensive non-destructive testing including 100% radiographic examination of all butt welds, dye penetrant inspection of fillet welds, helium leak testing of the tube bundle at 1.5 times design pressure, and hydrostatic testing of both shell and tube sides prior to shipment.
• Modular Maintenance-Ready Configuration: The removable tube bundle design allows for straightforward inspection, cleaning, and tube replacement without dismantling the entire unit. Flanged shell covers provide easy access to both tube sheets, minimizing downtime during scheduled maintenance shutdowns.

The CD-AP-400 Anodic Protection Sulfuric Acid Cooler is ideally suited for large-capacity sulfuric acid production plants, particularly in sulfur-burning and metallurgical off-gas based acid manufacturing facilities. It serves as the primary acid cooling stage in absorption and drying tower circulation loops where high-flow, high-concentration acid must be reliably cooled to maintain optimal absorption efficiency. The cooler is also deployed in spent acid regeneration plants, copper smelter gas cleaning systems, and phosphate fertilizer complexes where concentrated sulfuric acid heat recovery is critical to process economics. Additionally, its low pressure drop characteristics make it the preferred choice for retrofit projects where existing pumping infrastructure limits the allowable pressure loss across the cooling circuit, enabling capacity upgrades without requiring pump replacements.

Each CD-AP-400 cooler undergoes a rigorous quality assurance program prior to shipment. All materials are sourced from ISO-certified mills with full mill test certificates provided. Fabrication is performed by ASME-certified welders under a qualified welding procedure specification. Every unit is hydrostatically tested on both shell and tube sides at 1.5 times design pressure, followed by a helium mass spectrometer leak test to confirm zero detectable leakage. The anodic protection system is factory-commissioned and functionally tested with simulated acid conditions. For transportation, the cooler is shipped as a single assembled unit secured on a heavy-duty steel base frame with protective end covers over all flange faces and nozzle openings. The anodic protection control panel is packed separately in a waterproof wooden crate. All exposed machined surfaces receive a rust-preventive coating, and the complete assembly is wrapped in heavy-gauge polyethylene sheeting for weather protection during ocean freight. Comprehensive documentation includes material test reports, NDT records, hydrostatic test certificates, anodic protection system calibration reports, installation and operation manuals, and the ASME U Stamp data report.