Category: Alfa Laval

Aalborg D Multi-fuel boiler with top-fired burner technology

for Offshore applications

Introduction

The Alfa Laval Aalborg D Multi-fuel is a high-performance oil- and

gas-fired boiler engineered for the demanding conditions of the

offshore industry. Featuring advanced top-fired burner technology,

it delivers optimal combustion and flexibility, supporting both steam

and air atomization for reliable operation.

Designed to operate efficiently with a wide range of fuels, including

MGO, MDO, LNG, VOC gas, HFO, LFO, liquid condensate, and

crude oil, the Aalborg D adapts seamlessly to your fuel supply and

operational needs.

Available as a saturated steam boiler, superheated steam boiler, or

hot water heater, it is ideal for service steam, power generation, and

heat exchange applications offshore.

The Aalborg D’s multi-fuel, multi-burner configuration allows

burners to operate simultaneously on gas and liquid fuels, as well

as dual-fuel firing across various load ranges using advanced

combustion techniques. Integrated flue gas recirculation and

air/fuel staging reduce NOx emissions, ensuring compliance

with international emissions standards and supporting your

sustainability targets.

The Alfa Laval Aalborg D is a large-capacity marine boiler for producing

steam or hot water, especially on tankers. Fired with oil or gas, it has a

D-type design, in which the steam drum and water drum are connected

by a generating tube bank. The boiler’s furnace, which contains little

refractory, has membrane walls with external downcomers that promote

effective circulation. Delivered as a complete unit, the Aalborg D has a

steam capacity range of 25–120 t/h and a design pressure of 18 bar(g).

Large-capacity fired boiler with proven design

• Match your capacity needs with standard boiler sizes, delivered as

complete units for easy installation

• Configure for oil or gas as fuel, changing no more than the burner

• Produce steam with high efficiency and natural water circulation

Aalborg D is a standard vertical two-drum boiler. The furnace is built of

membrane walls and contains a minimum of refrac tory. The convection

section consists of straight pin tubes with bent pins that provide a high

heat transfer coefficient and low pressure loss. Circulation is ensured by

downcomers arranged outside the furnace.

Capacity range: 25 – 120 t/h

Aalborg 3-Pass is an oil and gas-fired industrial boiler, which is designed and optimised

with the total of Alfa Laval’s technical and innovative competencies in every detail – inside out.

Industries

Oil and Gas

Oil and gas operations are all about constantly optimizing process performance while

maintaining safety for people and the environment.

Renewable power

Renewable power generation promotes sustainable development through a sound and

secure energy supply. Alfa Laval’s expertise, equipment and services contribute to a

low-carbon energy future.

Thermal power

Increasing efficiency and reliability calls for broad expertise, technologies and services.

Alfa Laval’s solutions for turbine-driven power plants help secure stable, economical supply

of electricity.

Design data

• Heat capacity:1.5 – 25.5 MW

• Steam capacity: 2.0 – 39 t/h

• Design pressure:up to 20.7 bar g

• Steam temperature:Saturated

• Efficiency (DIN 1942):91-95%

A thoroughly industrial design based on recognized and well proven principles.

Utilizing the latest technology, the boiler is optimized to assure quality, reliability,

long life, easy maintenance and sound economy.

Technical data

Aalborg CHB boilers offer capacities ranging from 0.75 to 8 t/h. Standard design pressure

is between 10 and 18 bar(g), with thermal output up to 6 MW.  Several capacities and

dimensions available for the standard product range.

Options

In addition to the standard configuration features, the Aalborg CHB can be equipped with

a wide range of optional accessories according to a specific vessel’s needs. 

These include:

• Flue gas economizer

• For optimized performance and fuel savings, boiler can be equipped with external flue gas

economizer to further improve thermal efficiency.

• Electrical heating elements

• For emission-free port operation, electric heating elements can be integrated to provide

steam while the vessel is connected to shore power.

• Water Chemistry Solution

• Ensuring the long life cycle of steam generation system equipment and maintaining

operational reliability.

• Pressurized deaerator

A pressurized deaerator ensures optimal feedwater quality by thermally degassing dissolved

oxygen and other non-condensable gases. This significantly reduces corrosion risk and improves

the reliability and longevity of the boiler system.

How it works

Standard configuration

The Aalborg CHB design consists of a large furnace welded to vertical, plain-type convection

tubes with spiral inserts. The low-alloyed plate material is easy to weld and is highly durable

to prevent cracking. Aalborg CHB boilers have fully water-cooled furnaces and can be

equipped with various burner types. The boiler comes complete with connections, foundation,

inspection hatches, manhole, hand-holes, insulation with sheeting as well as all valves and fittings.

Other standard features include:

• Modulating boiler water regulation

• Burner type according to preference and the type of fuel used

• Alfa Laval Gas Valve Units (GVU) and Methanol valve units (MVU) for alternative fuels

• Processor-based control system

• Control panel with touchscreen interface for all necessary operation, communication,

safety and alarm functions

• Integrated water-washing device

• Spare parts according to classification society demands

Standard configuration

The Aalborg CHB design consists of a large furnace welded

to vertical, plain-type convection tubes with spiral inserts. The

low-alloyed plate material is easy to weld and is highly durable to

prevent cracking.

Aalborg CHB boilers have fully water-cooled furnaces and can be

equipped with various burner types. The boiler comes complete

with connections, foundation, inspection hatches, manhole, hand

holes, insulation with sheeting as well as all valves and fittings.

Other standard features include:

• Modulating boiler water regulation

• Burner type according to preference and the type of fuel used

• Alfa Laval Gas valve units (GVU) and Methanol valve units

(MVU) for alternative fuels

• Processor-based control system

• Control panel with touchscreen interface for all necessary

operation, communication, safety and alarm functions

• Spare parts according to classification society demands

A pressurized deaerator ensures optimal feedwater quality

by thermally degassing dissolved oxygen and other non

condensable gases. This significantly reduces corrosion risk

and improves the reliability and longevity of the boiler system.

Technical data

Aalborg CHB boilers offer capacities ranging from 0.75 to 8 t/h.

Standard design pressure is between 10 and 18 bar(g), with

thermal output up to 6 MW. The table below shows capacities

and dimensions for the standard product range.

Benefits

The Aalborg CHB is a highly efficient boiler, with an efficiency level

of up to 89% at nominal load. With a number of advanced design

features, the boiler provides several important benefits for ship

owners and operators:

• Reduced fuel consumption with corresponding reduction in

vessel operating costs

• Decreased CO2 and NOx emission levels

• Good combustion due to proper furnace dimensioning

• Moderate loading and low material stresses

• Minimal refractory with water-cooled furnace bottom

Options

In addition to the standard configuration features, Aalborg CHB

can be equipped with a wide range of optional accessories

according to a specific vessel’s needs. These include:

• Flue gas economizer

For optimized performance and fuel savings, boiler can

be equipped with external flue gas economizer to further

improve thermal efficiency.

• Electrical heating elements

For emission-free port operation, electric heating elements

can be integrated to provide steam while the vessel is

connected to shore power.

• Water Chemistry Solution

Ensuring the long life cycle of steam generation system

equipment and maintaining operational reliability.

• Pressurized deaerator

Introduction

The Alfa Laval Aalborg CHB is a vertical, highly efficient marine

steam boiler designed with an advanced convection section. In

addition to conventional marine fuels, the boiler is fully compatible

with a wide range of alternative fuels, such as methanol.

For low-emission port operations, the boiler can be equipped

with integrated electric heating elements. This enables reliable

steam production while the vessel is connected to shore power,

eliminating the need for fuel firing during berth periods.

Thanks to an upgraded thermal design with optimized flue gas

oxygen content, the Aalborg CHB offers a level of efficiency that

far surpasses typical boilers of a similar capacity range. This

ensures both lower operating costs and a reduced environmental

impact.

Customer benefits

Easy installation

The boiler is ready to be plugged in. Supplied with ready-mounted burner, control panel,

fittings and cables.

Compact design

The small footprint makes the boiler easy to incorporate.

Easy inspection and maintenance

To the greatest possible extent, all connections and valves are located on top of the boiler

– easily accessible during installation, inspection and maintenance. A number of manholes

facilitate internal inspection.

Easy to clean

The smoke tubes are fast and easy to clean thanks to the low number and efficiency of

the spiral tubes.

Uniform, high steam quality

The boiler’s efficient steam drier delivers a dry, saturated steam. A superheater can also

be installed.

Improved combustion

The furnace has a comparatively low heat release ratio and provides ample space for the

flame. This improves combustion and limits flue gas emissions.

Accessories

The boiler plant can be equipped with economizer, superheater, condensate tank, deaerator,

feed water tank, blow down tank, and O2 combustion control.

Alfa Laval Aalborg steam boilers build on more than 100 years of boilermaking

experience. Fired Aalborg boilers combine proven thermal design with effective,

low-emission burner technology, which lets them deliver saturated or superheated

steam with high efficiency and reliability. Thanks to furnace and tube designs

that optimize durability as well as heat transfer, they provide lasting uptime

and performance in a wide range of marine and industrial applications.

Through over a century of work with steam and heat generation, Alfa Laval has

developed efficient and reliable boiler technology with high flexibility for modern

demands.

Benefits of Alfa Laval Aalborg steam boilers

• Flexibility to work with diverse fuels, pressure ranges and steam applications

• High thermal efficiency and reliable performance thanks to optimized furnaces

and tubing

• Easy installation and integration with the help of compact designs

• Robust boiler construction that delivers long service life in demanding conditions

• Easy inspection and maintenance that keep efficiency high and downtime low