Category: Alfa Laval

Aalborg H/HW boiler is designed for waste heat recovery after gas or diesel engines.

Both boilers have a simple and very reliable construction.

Horizontal or vertical installation with excellent vibration resistance

• Stable output due to relatively large water volume

• Excellent match for HFO heating or applications with low to moderate steam demands

• Integrated exhaust gas bypass system for capacity modulation

• Valves and instrumentation with a selectable range of automation

• Suitability for district heating via hot water

Design data

• Engine output:No limits, depending on engine

• Engine fuel type: Light oil, liquid biofuel, heavy fuel oil, natural gas

• Exhaust gas inlet temperature:< 530 °C

• Exhaust gas flow: No limits

• Typical operating pressure:< 20 bar(g)

• Steam temperature: Saturated

• Typical pinch point: > 20 ºC

How it works

Aalborg H/HW boilers are available with vertical or horizontal layouts.

The Aalborg H, which is used for steam generation, has an integrated steam space and

employs natural circulation. The Aalborg HW, which is used in hot water applications,

has flow-optimizing baffle plates and employs forced circulation.

Both models have a simple and reliable construction comprised of bare smoke tubes,

which are welded to tube plates at both ends of the shell.

Design data

• Engine output:No limits, depending on engine

• Engine fuel type: Light oil, liquid biofuel, heavy fuel oil, natural gas

• Exhaust gas inlet temperature:< 530 °C

• Exhaust gas flow: No limits

• Typical operating pressure:< 20 bar(g)

• Steam temperature: Saturated

• Typical pinch point: > 20 ºC

Unique boiler construction

A unique supporting arrangement without endplates, enhanced by computerised

analyses ensures a vibration and thermal stress-free boiler structure sustaining

even the most demanding operational conditions of engine-based heat recovery

applications.

Reliable natural circulation

As a standard for steam applications, Alfa Laval Aalborg offers reliable natural

circulation solutions without the need of circulation pumps providing the following

advantages:

• Reliability

• Minimised risk of soot fires

• Less power consumption

• Cost effectiveness

• Fast site installation

• Reduced foundation work and minimized piping and cabling

• Small footprint

Conventional forced circulation boilers are also available.

Easy to clean

The tube arrangement of the Aalborg AV-6N heating surface ensures easy

maintenance and service. Aalborg AV-6N boilers can be cleaned during operation

reducing the need for engine shut-down. In addition to standard high-efficient

steam soot blowers, an air-type can also be applied.

Hot-water heating for free

The Aalborg AV-6H exhaust gas boiler is a water tube boiler for heat recovery,

typically after gas engine. The boiler comes in a horisontal layout and compact

workshop assembled module. It is easy and fast to install while allowing maximized

access for convenient maintenance and service.

• High-efficient counterflow design for heating of hot water

• Proven design to ensure effective and fast cleaning of condensed lube oil residuals

(in gas engine application)

• Compact and flexible layout with integrated walkable service area

• Low operational weight

• Minimized gas pockets

Alfa Laval offers reliable natural circulation solutions as a

standard for steam applications, eliminating the need for

circulation pumps and providing several advantages. These

include enhanced reliability, minimized risk of soot fires, reduced

power consumption, cost effectiveness, fast site installation,

reduced foundation work, minimized piping and cabling, and

a small footprint. Additionally, conventional forced circulation

boilers are also available.

Hot-water heating for free

Waste heat can also be recovered for use in hot water systems,

typically downstream of gas engines. The boiler module is

available in either vertical or horizontal configurations and

is delivered as a compact, pre-assembled unit. This design

ensures quick and straightforward installation, while providing

optimal access for maintenance and servicing.

• High-efficient counterflow design for heating of hot water

• Proven design to ensure effective and fast cleaning of

condensed lube oil residuals (in gas engine application)

• Compact and flexible layout

• Low operational weight

• Minimized gas pockets

Easy to clean

The tube arrangement of the Aalborg AV-6N heating surface

ensures easy maintenance and service. Aalborg AV-6N boilers

can be cleaned during operation reducing the need for engine

shut-down. In addition to standard high-efficient steam soot

blowers, an air-type can also be applied.

Design data

• Engine output: No limit, depending on engine

• Engine fuel type: Light oil, liquid biofuel, heavy fuel oil,

natural gas

• Typical exhaust gas flow: 5–60 kg/s

• Exhaust gas temp.: Standard up to 610 ºC

• Operating steam/water pressure: Typically 5-30 bar(g),

max. 65 bar(g)

• Steam/water temperature: Standard up to 450 ºC

• Natural circulation as standard – forced on special demand

• Pinch point: Typical 10 – 20 ºC (min. 5 ºC, limited by

feasibility only)

Unique boiler construction

A unique supporting arrangement without endplates, enhanced

by computerised analyses ensures a vibration and thermal

stress-free boiler structure sustaining even the most demanding

operational conditions of engine-based heat recovery

applications.

Reliable natural circulation

Alfa Laval offers reliable natural circulation solutions as a

standard for steam applications, eliminating the need for

circulation pumps and providing several advantages. These

include enhanced reliability, minimized risk of soot fires, reduced

power consumption, cost effectiveness, fast site installation,

reduced foundation work, minimized piping and cabling, and

a small footprint. Additionally, conventional forced circulation

boilers are also available.

Easy to clean

The tube arrangement of the Aalborg AV-6N heating surface

ensures easy maintenance and service. Aalborg AV-6N boilers

can be cleaned during operation reducing the need for engine

shut-down. In addition to standard high-efficient steam soot

blowers, an air-type can also be applied.

Main benefits

• Reduced fuel consumption, leading to remarkable cost

savings and lower CO2 emissions

• Natural circulation: high availability, low operational and

maintenance costs

• Compact heating surface, optimizable for different

applications

• Small water volume inside the boiler allows it to respond

quickly to load changes

• Freedom of scope: shop-assembled, or with maximised

scope for local outsourcing (e.g., insulations, platforms,

inter-connecting pipes etc.)

Boiler design

The boiler’s compact and flexible design, which makes it easy to

install, also allows cleaning during operation, which minimizes

engine shutdowns and increases plant availability.

Designed with extended heating surface, Aalborg AV-6N is

compact and cost-effective. The possibility of cleaning during

operation minimizes the need for engine shutdowns and

increases the overall plant availability.

Natural circulation is used in the standard steam configuration

with resulting advantages for reliability, safety and energy

efficiency, although traditional forced-circulation models are

available if specifically requested.

Introduction

Aalborg AV-6N boiler efficiently recovers waste heat from exhaust

gases, making it ideal for steam and/or hot water production. This

boiler is constructed to recover heat from diesel and gas engines,

gas turbines or other heat sources.

The robust and highly efficient water tube boiler significantly

enhances the overall efficiency of power and industrial plants and

reduce the use of fuel, leading to remarkable cost savings and

lower CO2 emissions.

By utilizing heat energy from engine/gas turbine exhaust or

process industry flue gas that would otherwise be released

into the atmosphere, the Aalborg AV-6N contributes to a more

sustainable operation.

Application

As the marine industry decarbonizes, more ports around the

globe are investing in shore power installations. Yet while shore

power provides electricity during a port stay, the vessel’s need for

steam remains. Although fired boilers can generally be used in

port, direct emissions are best kept to a minimum.

With the Aalborg electric steam boiler, vessels can meet the

needs of steam consumers without resorting to combustion.

The boiler can use either the onshore grid or the extra electricity

available on board, such as the surplus on LNG carriers and

FSRUs that comes from using the gensets to manage boil-off

gas (BOG). In both cases, it improves fuel economy and the

vessel’s green profile.

Benefits

• Steam or hot water production without direct emissions

• Reduced overall emissions and carbon footprint

• Reduced fuel consumption and associated costs

• Small installation footprint

• High turn-down ratio for increased efficiency

Working principle

The Aalborg electric steam boiler is much simpler in design and

operation than a traditional fired boiler. It comprises electric

heating elements that work in steps, with each element supply

ing six stages. Load regulation is possible down to 60 kW.

When steam is required, the relay-based control system en ables

the heating elements incrementally until the demand is met.

If the boiler is used at sea, where the electricity supply varies, it

can be signalled to start only when sufficient power is available.

Benefits

• Steam or hot water production without direct emissions

• Reduced overall emissions and carbon footprint

• Reduced fuel consumption and associated costs

• Small installation footprint

• High turn-down ratio for increased efficiency