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.

Electric hybrid capability (option)

Besides serving as a fired boiler, the Aalborg OS-TCi can be

configured as a hybrid boiler, allowing it to operate on electrici

ty. This lets it utilize shore power or surplus electricity on board,

producing steam or hot water without direct emissions. It also

enhances the boiler’s turn-down ratio, which improves startup

time and reduces maintenance by enabling continuous

operation at lower loads.

The optional electric heater comprises one or two heating

elements, each 600 kW in capacity. To incorporate it, the

boiler interior must be modified. This has no impact on the

boiler’s high efficiency, but it may require small adjustments

in height or diameter.