Aalborg electric steam boiler

Onboard steam production using shore power or surplus

electricity

The Alfa Laval Aalborg electric steam boiler is a simple, com pact

and combustion-free solution for meeting vessel steam needs.

By utilizing shore power or the electricity already on board, it

delivers steam without producing additional emissions. When

the vessel is connected to the onshore grid, the fired boiler can be

shut down completely, reducing emissions from tank to wake.

Installation

The boiler is compact and has a small footprint that sim plifies

placement on board. Available in three size configurations, it is

delivered as loose compo nents and installed horizontally.

Maintenance

No regular maintenance is required. However, the boiler should

be inspected once per year to ensure that its heating elements

are working properly.

Approvals

The Aalborg electric steam boiler is type approved by all major

marine classification societies.

The Aalborg XW-TG can be arranged in many different confi

gurations, e.g. for a single pressure or dual pressure system,

according to each individual requirement for steam and power

output.

We have developed and supplied the Turbo Compound System

in co-operation with Dresser Rand, Siemens AG and Wärtsilä

Corporation. Naturally, the system works equally well with other

diesel main engines, e.g. MAN engines. The Turbo Compound

System generates electric power equal or up to more than

11% of the main engine output on large container ships from

waste heat while at the same time reducing emission of harmful

exhaust gases like CO2. SOX and NOX into the environment.

We have achieved documented fuel savings and thereby

reduced CO2 emissions in double digit percentages.

Besides container ships, the Turbo Compound System can

also be applied with advantage to other ship types such as

VLCCs, bulk carriers, etc.

For enhancement of an efficient, safe and reliable operation, the

Aalborg XW-TG is therefore among other things supplied with the

following equipment (advantageous for ordinary economizers as

well):

• Steam drum(s) for efficient separation of dry steam for

superheating

• High-efficient, electrical operated sootblowers using steam

or compressed air as blowing medium for on-load cleaning

• Fixed nozzle pipes for off-load water washing

• Extended monitoring equipment (e.g. exhaust gas pressure

drop/temperatures and fire detection)

• Dampers for by-passing of exhaust gas at low load operation

(and in case of emergency)

• Circulation pumps of canned motor type (with external

cooling) with flow monitoring system

• PLC based control system including online performance

monitoring and  help functions

The Aalborg XW-TG is a water tube, forced circulation exhaust

gas economizer designed to utilize thermal energy in diesel

engine exhaust gas. The standard Aalborg XW design has

been enhanced to more efficiently utilize the wasted energy

after large diesel engines with saved fuel consumption and

reduced CO2 emissions as a result.

Aalborg XW-TG generates superheated steam for power

generation by means of a steam turbine driven generator

(turbo generator).

The Aalborg XW-TG is based on and has the same charac

teristics as our well-known Aalborg XW which is a water tube,

forced circulation exhaust gas economizer with double gilled

tubes specially designed for heat recovery from diesel engine

exhaust gas.

When applied for large heat recovery rates, the heating surfaces

are required to be much increased in size and it is increasing

ly more important to focus on operation reliability to provide

full benefit of the relatively high investment.

The Aalborg XW is a water tube, forced circulation exhaust gas

economizer. It is specially designed to utilize thermal energy in

diesel engine exhaust gas but the basic design suits numerous

applications.

Boiler characteristics:

•  Forced-circulation exhaust gas economizer

•  Water tube economizer with gilled tubes for exhaust gas

heat recovery

•  Robust, well-proven construction, able to withstand

vibrations and exhaust gas pulsation

•  Heating surface composition which ensures the required

output from the most compact unit

•  Efficient, well-proven cleaning system with steam or air

soot blowers

•  Superheater and preheater as an option

The Aalborg XW is a water tube, forced circulation exhaust gas

economizer. It is specially designed to utilize thermal energy in

diesel engine exhaust gas but the basic design suits numerous

applications.

Steam capacity: 0.2 – 17.0 t/h

Design pressure: 18 bar(g) or 24 bar(g)

Description

The Aalborg XW is a water tube, forced circulation exhaust

gas economizer. It is specially designed for heat recovery

from diesel engine exhaust gas but the basic design suits

numerous applications.

The heating surface is made of double gilled tubes with a

spacing which minimizes soot build-up. It is supplied with an

efficient cleaning system with steam or with compressed

air sootblowers.

The economizer can be supplied with a dividing wall system

for connection of several exhaust gas sources to one econo

mizer.

The Aalborg XW may be used in conjunction with an oil-fired

auxiliary boiler or a separate steam drum, in both cases act

ing as a steam/water separator.

The Alfa Laval Aalborg XS-2V is a robust smoke-tube economizer.

Easy to install, operate and maintain, it reduces the use of the fired

marine boiler by recovering heat energy that otherwise would be lost

through the exhaust gas. The Aalborg XS-2V is similar to the Aalborg

XS-7V, but it is equipped with its own steam space, which makes it a

complete exhaust gas boiler. Its proven design includes a dual-inlet

option, which creates high installation flexibility.

Characteristics

• Vertical smoke tube exhaust gas economizer

• Own steam space or forced circulation

• Designed to utilize thermal energy in exhaust gases

• Quick start up

• Simple and automatic opeation

• Easy maintenance

• Standardized components

• All-welded contructions

• Integrated silencer as an option

• Compact and easy to install

Design data

• Steam capacity: 0.5 – 5 t/h

• Heat capacity: 0.3 – 4 MW

• Design pressure:10 bar(g)

Dual-inlet flexibility and steam independence

• Simple and reliable design based on smoke tubes – with its own

steam space

• Easy improvement of Carbon Intensity Indicator (CII)

• Short payback time (typically 1–2 years) through up to 25% fuel

savings on the fired boiler

• Reduced wear and maintenance on the fired boiler

• Dual-inlet option allowing connection of two engines to one

economizer

Characteristics

• Vertical smoke tube exhaust gas economizer

• Own steam space or forced circulation

• Designed to utilize thermal energy in exhaust gases

• Quick start up

• Simple and automatic opeation

• Easy maintenance

• Standardized components

• All-welded contructions

• Integrated silencer as an option

• Compact and easy to install

Reduce fuel costs and emissions

The Aalborg XS-2V is part of Alfa Laval’s broad waste heat recovery

portfolio, which builds on over 40 years of waste heat recovery experience.

We take a holistic approach, helping you identify the optimal economizer

setup for your particular vessel.

Our solution is always tailored to your steam requirements, the amount

of exhaust gas and your vessel’s unique characteristics.

It can include:

• Smoke-tube or water-tube economizers

• Single-inlet or dual-inlet solutions

• Compact economizers to minimize installation footprint

The economizer is carried out with the smoke tubes welded to the tube

plates at both ends, and this robust design can, in emergency cases,

withstand running dry.

The Aalborg XS-2V comes with its own steam space and is able to operate

independently from the oil-fired boiler/steam drum.

The sizes of the economizers depend on required steam capacity, amount

of exhaust gas, temperature, and working pressure.

Design

Built for simplicity and reliability, the Aalborg XS-TC7A has a

vertical, all-welded design with helix smoke tubes. The helix

design of the tubes greatly increases the available heat trans

fer area, which makes this the smallest smoke-tube econo

mizer on the market. Together with the optimized convection

section, it ensures a high ratio of output to weight.

The helix tubes and the economizer’s self-cleaning Turbo

Clean technology both reduce soot build-up, which makes

XS-TC7A easy to clean and maintain. If needed, individual

smoke tubes can also be repaired or replaced.