CCUS Reboiler Welded Coiled Tubing

-- A High-Efficiency Heat Exchange and Corrosion-Resistant Solution for Carbon Capture Reboiler Systems

Discover high-efficiency welded coiled tubing solutions designed for CCUS amine regeneration reboilers. These corrosion-resistant continuous coils eliminate weld risks, enhance heat transfer, and significantly extend system service life.

In carbon capture, utilization, and storage (CCUS) processes, the reboiler serves as the core heat exchange equipment in the amine regeneration system. Its primary function is to heat amine-rich liquid that has absorbed carbon dioxide, causing it to release high-purity carbon dioxide and convert into amine-lean liquid for recirculation. This process typically operates at high temperatures ranging from 120°C to 150°C, and the medium contains high concentrations of amine solution and CO₂ degradation products, creating an extremely corrosive chemical environment.

Heat exchange efficiency and material corrosion resistance are key indicators determining the economic viability of reboiler operation. Experimental data indicate that when monoethanolamine is used as the absorbent, the uniform corrosion rate under high-temperature conditions increases significantly with rising carbon dioxide loading. Consequently, industrial design typically requires the selection of materials with a high pitting equivalent index. Austenitic or duplex stainless steel is a common choice, typically containing at least 18% chromium to form a stable passivation layer. Under more severe conditions, nickel alloys, with a nickel content exceeding 35%, can effectively prevent chloride-induced stress corrosion cracking.

Welded coil tubing technology provides a physical safeguard for the structural integrity of the reboiler. Compared to tube bundles welded from multiple sections of straight pipe, continuous-length welded coils tubing eliminate approximately 90% of the circumferential welds and mechanical connection points in the system. According to fluid dynamics simulations, this seamless, continuous structure significantly optimizes the flow pattern of the medium within the tubes and reduces the potential leakage rate caused by weld defects by more than 80%.

Evaluations by authoritative engineering institutions indicate that the use of high-performance alloy welded coiled tubes in carbon capture reboilers can significantly enhance the system’s overall heat transfer efficiency. Thanks to the material’s exceptional resistance to pitting corrosion, the service life of critical heat exchange components can be extended from the traditional 8 years to approximately 20 years. This technical solution ensures carbon capture rates while significantly reducing lifecycle maintenance costs and downtime risks.