Aalborg XWi
The Alfa Laval Aalborg XWi is an exhaust gas boiler designed for waste heat recovery from engine exhaust gas. The top mounted steam drums for natural circulation remove the need for circulation pumps and can be equipped with electric heating elements. The heating surface consists of a water tube evaporator section to generate high pressure steam. Additional heating sections are also available: Economizer, superheater, low pressure evaporator and/or hot water section to improve energy efficiency.
Alfa Laval Aalborg XWi - natural circulation exhaust gas boiler
- Maximized heat recovery potential for CO2 reduction onboard
- Simple, reliable and efficient operation with natural circulation
- No power consumption and mainte¬nance costs for pumps
- Compact unit, easy installation and clear responsibility
- Potential integration of electrical steam generation while engine is not running
The Aalborg XWi boiler with natural circulation offers savings in waste heat recovery systems and eliminates all typical problems associated with forced circulation systems, such as cavitation, water hammering and operation and maintenance losses.
The Aalborg XWi boiler drum can be integrated with electrical heating elements to utilize shore power connection for steam generation while on port. The heating surface configuration is flexible. The energy efficiency of the system can be increased by adding tube section for feed water preheating and/or superheating as well as hot water generation. The design of the heating surface can be tailored to the actual engine and operating conditions, maintaining sufficient exhaust gas velocity for the best self-cleaning effects within the design limits.
How it works
Natural circulation refers to the ability of fluid in a system to circulate by means of gravity and density differences. In the Aalborg XWi, circulation begins naturally when the engine starts and ends naturally when the engine stops. Water remains inside the heating surface tubes, which prevents the risk of a soot fire, and energy loss is minimized because there is no unnecessary circulation during standstill.
Because water only circulates through the Aalborg XWi when the engine is running, no heat is lost to the cold air that flows through the boiler when the engine is stopped. This means less use of the fired boiler, with lower fuel costs and emissions as a result.
When the circulation is stopped, water fills the boiler tubes. This minimizes the risk for soot fires, which can occur with forced circulation. In forced circulation, typical system arrangement and sudden changes in engine load often lead to problems in water circulation, such as pump cavitation, which can cause a soot fire within the system
Service
We provide full support for our cruise & ferry steam boiler systems. Our support covers their entire life cycle, from design, installation and commissioning, past warranty and throughout the entire service life.
We can’t predict the future, but Alfa Laval Service Agreements can make it less uncertain. A fixed-period service agreement makes operation planning and cost projections more secure. A well-crafted maintenance strategy offers transparent cost control and safeguards performance, lengthening your equipment’s lifespan and reducing your total operating costs. Expert maintenance not only improves the performance of your Alfa Laval equipment, but also helps you get more from the equipment surrounding it.