Marine Urea Solution[2]
Overview
Marine Urea Solution is a specialized chemical formulation designed for use in marine Selective Catalytic Reduction (SCR) systems. It consists of 32.5% high-purity urea dissolved in deionized water, meeting strict ISO 22241 standards for marine applications. This solution is critical for ships to comply with International Maritime Organization (IMO) Tier III NOx emission regulations under MARPOL Annex VI. The product is specifically engineered for the harsh marine environment, with additives to prevent crystallization and ensure stable performance. Unlike automotive-grade DEF (AdBlue), marine formulations must withstand longer storage periods and more extreme temperature variations while maintaining consistent quality for reliable SCR system operation.
Physical and Chemical Properties
Marine Urea Solution appears as a clear, colorless liquid with a density of approximately 1.09 g/cm³ at 20°C. The pH typically ranges between 9.0-11.0, making it slightly alkaline. The solution has a freezing point of about -11°C, requiring special consideration in cold climates. Key chemical properties include its thermal stability (decomposes above 80°C) and reaction characteristics in SCR systems. When injected into exhaust streams, it decomposes to form ammonia, which then reacts with NOx to produce harmless nitrogen and water. The solution is non-flammable and has low volatility, but may crystallize if exposed to temperatures above 50°C for extended periods.
Main Applications
The primary application of Marine Urea Solution is in marine diesel engine exhaust aftertreatment systems. It's used in SCR technology to reduce NOx emissions by up to 90%, helping vessels meet IMO Tier III requirements. The solution is automatically dosed into the exhaust stream before the SCR catalyst. Major users include cargo ships, tankers, cruise liners, and offshore vessels. The solution is also used in port equipment and some stationary marine diesel generators. Beyond emission control, proper urea solution management is now part of ship operational procedures, with documentation required for regulatory compliance during port state inspections.
Safety and Storage
Marine Urea Solution requires careful handling despite its relatively low hazard profile. Storage tanks should be made of approved materials (stainless steel or specific plastics) to prevent contamination. The solution is sensitive to metallic impurities which can deactivate SCR catalysts. Recommended storage temperature is between 5-25°C, with protection from direct sunlight to prevent urea decomposition. Bulk storage systems should include temperature monitoring and agitation for homogeneous mixing before use. Shelf life is typically 12 months when stored properly, though marine-grade formulations often include stabilizers for extended durability in challenging conditions.
B2B Procurement Guide
When procuring Marine Urea Solution, verify the supplier's ISO 22241 certification and quality control processes. For ship operators, consider delivery logistics - some suppliers offer bunkering services similar to fuel delivery. Bulk purchasing typically offers cost advantages but requires adequate storage capacity. Key procurement factors include: batch consistency testing, packaging options (IBCs, drums, or bulk), regional availability, and technical support. Many classification societies (DNV, ABS, LR) provide approved supplier lists. For newbuilds, coordinate with SCR system manufacturers for compatibility verification. Maintenance contracts for dosing systems often include urea supply agreements.
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