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The Alfa Laval Aalborg Micro is a uniquely compact water-tube economizer. Easy to install, operate and maintain, it reduces the use of the fired boiler by recovering heat energy that otherwise would be lost through the engine exhaust gas. This ensures a rapid return on investment. Despite its minimal footprint, height and weight, the Aalborg Micro has an extended heating surface created by coiled fin tubes. Even more efficient than smoke-tube economizers, it provides an ideal retro fit solution where no other economizer will fit. Application Only a portion of the fuel energy released by marine engines actually goes to propulsion. A large amount of it escapes as heat, and it makes sense to reclaim as much of this en ergy as possible. This is true for auxiliary engines as well as main engines. Steam produced with the Aalborg Micro can support or fulfil steam needs in port, but it can also serve other functions. For vessels whose long-stroke main engines produce cooler exhaust, it can provide a needed steam boost during a voyage. If there is no steam shortage while sailing, the additional steam produced with the Aalborg Micro can be used to generate electricity, for example by means of Organic Rankine Cycle (ORC) technology.  

Technical data Gas Turbines fired with different fuels such as: • Natural gas • Diesel oill Heating media: • Hot water • water-steam • Superheated steam • Thermal oil • TEG or equal Design options: • Dry run or non-dry run • With or without integral bypass and diverter damper • External and Internal insulation • Fixed or removable tube bundle Materials: • Tubes in carbon steel, alloy steel or stainless steel • Casing and ducts in carbon or corten steel  

Alfa Laval’s Waste Heat Recovery Unit (WHRU) optimized for recovering waste heat after gas turbines. Application The waste heat recovery unit recovers thermal energy in the waste heat from the gas turbine exhaust gas, enabling generation of hot water, water-steam or superheated steam. The WHRU is also capable of heating up thermal oil and TEG, and can be designed to fit individual customer needs and optimum performance. Customer benefits • Customized design • Global service network • Large installed base • Large manufacturing capabilities • WHRU incl. extended scope Applications • FPSO • Process industry • District heating • Power generation Standard scope of supply • WHR-unit • Insulation & cladding • Ducts • Stack • Silencer • Expansion joints • Diverter • Control system • Instrumentation • Deaerator/feed water tank • Feed water treatment system (incl. chemical dosing unit) • Bypass – external or internal byppass • Documentation  (relevant manuals, certificates etc.)

Exhaust gas economizers capture waste heat energy from engines, gas turbines and more, enabling its reuse for steam production or other processes.This saves fuel, which provides rapid payback and helps reduce CO2 and other emissions. It also reduces the running hours of the fired boiler/heater, which lowers maintenance costs. Our Alfa Laval Aalborg portfolio includes a wide range of economizers for industrial and marine use, as well as standalone exhaust gas boilers with integrated steam drums. We have effective waste heat recovery solutions to match a wide variety of needs. Our Alfa Laval Aalborg exhaust gas economizers and exhaust gas boilers combine exceptional thermal efficiency with proven reliability. Benefits of Alfa Laval Aalborg exhaust gas economizers • Significantly reduced emissions of CO2 and other greenhouse gases • Short payback time through fuel savings due to reduced reliance on combustion • Compact design ensured by optimized heating surfaces with high thermal efficiency • Innovative options for easy installation and integration – even in retrofit situations • Specific engineering to match each engine’s data and operating conditions

Design Compact and easy to install, the Aalborg OC-TCi operates on oils and biofuels and can also be configured for one alternative fuel: LNG, methanol or ammonia.* Additionally, it can produce steam through waste heat recovery. It is delivered with a preas sembled Aalborg burner built on Alfa Laval’s innovative Multi Flame (MF) concept. The boiler and burner are both engineered and produced in-house to ensure the highest reliability. • Aalborg OC-TCi boiler: The Aalborg OC-TCi is a side-fired composite boiler with a fired section comprised of helix tubes. This tube design provides more heat transfer area than competing solutions, which results in fuel-saving efficiency. For waste heat recovery, the boiler has 1–3 exhaust gas sections with smoke tubes, allowing it utilize exhaust gas heat from up to three engines. Combustion heat from the burner – or exhaust gas heat from waste heat recovery – is distributed uniformly through the boiler’s convection section. This ensures optimal heat transfer and reduces damaging thermal stress inside the boiler. • Aalborg MF PA burner: The Aalborg MF PA is a side-fired, pressure-atomizing burner that supports conventional fuels and gas fuels like LNG. By pre-mixing air and gas, it reduces the production of CO2. NOx and other emissions. • Aalborg MF SAS burner: The Aalborg MF SAS is a side-fired, steam/air-atomizing burner that supports conventional fuels and methanol.

Application

The Aalborg OC-TCi is a flexible marine boiler that can support

vessel operations in multiple ways:

• Steam generation:

The Aalborg OC-TCi is primarily used to provide steam for:

– Tank cleaning– HVAC

– Engine room consumers

• Waste heat recovery:

Besides generating steam with waste heat on its own,

the Aalborg OC-TCi can support one or more exhaust

gas economizers by serving as a shared steam drum.

• LNG safety:

On vessels using LNG as fuel, the Aalborg OC-TCi can:

– Support boil-off gas (BOG) management by safely

combusting BOG that cannot be consumed by an

auxiliary engine or genset

– Combust a free flow from the LNG tank if the vessel’s

compression train should fail

– Combust the mix of inert gas and methane that arises

before and after tank inspection, eliminating detours

for gas disposal

The Alfa Laval Aalborg OC-TCi is a marine composite boiler for producing steam through combustion and/or waste heat recovery. With its high efficiency and its ability to reclaim thermal energy, it can help reduce environmental impact. Ready for the fuel transition, the OC-TCi can use oils, biofuels and one alternative fuel of your choice. Additionally, it can be con figured as an electric hybrid. These options can be implemented directly, or the boiler can be prepared for their installation later. Benefits • Configuration for your choice of alternative fuels – implemented now or later • Hybrid and hybrid-ready options for electric operation • Reduced carbon footprint through waste heat recovery • Energy efficiency maintained through self-cleaning TCi (Turbo Clean, intelligent) technology • Trouble-free uptime, secured through robust design and user-friendly control

Especially on smaller vessels, a composite boiler can be a compact solution for meeting steam needs and reducing environmental impact. A composite boiler has both a fired section and an exhaust gas section, allowing it to produce steam through fuel combustion and/or waste heat recovery. The Alfa Laval OC-TCi is a composite marine boiler with the additional option of an electric heating element for use with shore power. The Aalborg OC-TCi composite boiler is built on Alfa Laval’s fuel-flexible and future-proof marine boiler platform, which supports both alternative fuels and hybrid operation with electricity. Benefits of the Alfa Laval Aalborg OC-TCi • Flexible steam production through combustion or waste heat recovery • Fired use with oils, biofuels and your choice of one other alternative fuel • Possibility to connect three waste heat sources • Maintained efficiency through self-cleaning TCi (Turbo Clean, intelligent) technology • Hybrid option to enable electric heating via shore power

Ready options for later conversion To support decarbonization at any pace, the Aalborg OS-TCi can be delivered in a multi-fuel-ready and/or hybrid-ready configuration. The necessary connections, space and internal adjustments are all prepared in the boiler design, so that components for a selected alternative fuel or electric hybrid operation can be added later. This future-proof solution reduces investment cost while enabling easy and cost-effective conversion at an ideal time. Control Like other Alfa Laval equipment on board, the Aalborg OS-TCi uses Alfa Laval Touch Control. This recognizable, user-friendly interface features a graphical touchscreen with intuitive navi gation, making it easy for the crew to learn and use it correctly. Robust and PLC-based, the control system offers future-proof expansion possibilities and support for remote troubleshooting.

Working principle During fired operation, heat from fuel combustion is transferred to the furnace shell, mainly through radiation. Flue gases leaving the furnace enter vertical uptakes where the heat is transferred to helix tubes, mainly through convection.  If the boiler is config ured as a hybrid, the electric heater provides an alternative heat source. Heat transferred through the furnace shell or the helix tube walls evaporates the adjacent saturated water on the boiler’s water side. This causes steam bubbles to form. Because the steam bubbles have a much lower specific density than the water, they rise rapidly into the steam space, where the water and steam are separated. Maintenance The Aalborg OS-TCi is effectively self-cleaning thanks to its TCi (Turbo Clean, intelligent) technology, which keeps the boiler running efficiently and prolongs its service life. The TCI cleaning process is fully automatic.