Alfa Laval Aalborg OC Modular composite boiler

Aalborg OC is a high performance, combined oil and exhaust

gas-fired boiler, with a 750-5.000 kg/h capacity of the oil-fired

section at 9 bar(g) design pressure. Aalborg OC is a vertical,

cylindrical boiler with an exhaust gas section consisting of bare

smoke tubes while the oil-fired section features pin tubes in

the convection section.

The boiler design has integrated pin tube elements. The pin

tube elements support both the furnace and the boiler top

plate. The design has been significantly optimised to achieve

lower weight and improved strength. The result: longer lifetime

of the pin tube by a factor of 8.

Description

Aalborg OC is a high quality composite boiler design offering

the space-saving alternative of two boilers combined into one.

Aalborg OC is a combined oil and exhaust gas-fired boiler

with a capacity range of up to 5.000 kg/h steam from the

oil-fired section and up to 3.000 kg/h from the exhaust gas

section. It is a standardised, preassembled boiler plant that is

fast and easy to install even if we design the boiler from case

to case to get optimum design. Aalborg OC is designed

according toAlfa Laval's modular Aalborg boiler concept.

Aalborg OC engages less deck area and has lower weight than

older designs of composite boilers.

Construction

Aalborg OC is a vertical boiler with an exhaust gas section consisting

of bare smoke tubes. The cylindrical shell surrounds

the smoke tubes, the furnace, the steam space and the convective

section, which consists of pin tube elements. The boiler

pressure part is manufactured from mild steel able to withstand

high temperatures. Stress concentrations in corners are minimised

by the simple design of cylindrical shells with flat plates

of equal thickness.

Burner

Aalborg OC is equipped with a Aalborg type pressure-jet burner

or Aalborg types rotary cup burner. The burner is mounted

and can be swung out for service and easy access to inspect

the furnace. The burner housing is mounted on the boiler front,

angled 15 degrees downwards against the furnace bottom. This

allows for a long flame and offers better utilisation of the furnace

and the result is a high performance combustion - even with.

The flow of the combusting particles becomes optimal, and

the result is a high performance combustion - even with the

lowest grades of fuel. As an alternative, Aalborg OC can be

equipped with a rotary cup burner.

Control system

The reliable and userfriendly microprocessor based Aalborg

control system facilitates the operation and control of the

Aalborg OC boiler. The control system provides fully automatic

operation of the boiler plant and the pressure jet

burner. The Aalborg control system includes burner load and

sequence controls, water level and safety device, burner

motor and fuel heater starter, and starter for fuel oil pumps.

Silencer

The composite boiler can be supplied with a compact silencer

to suit any type of diesel engine. The silencer is based on

well-proven technology. The optimum silencer dimensions are

unique for each installation and calculated on the following

basis:

• Engine type

• Exhaust gas amount and temperature at 100% engine load

• Required level of silencing

• Exhaust gas system dimensions

Customer benefits for shipyards and owners

Aalborg OC is designed to meet the ever increasing demands

for rational and cost effective shipbuilding - in every phase of

the project.

Virtually no on-site assembling

Aalborg OC can be delivered fully assembled.

Easy installation

Installation is a matter of connecting up with premounted

fittings and connections situated almost exclusively on the

boiler top. Inlet and outlet boxes are included and the boiler

foundation is prepared for welding to the deck. When opting

for the composite boiler solution, only one boiler has to be

installed and a circulation pump is superfluous.

Project and engineering hours cut to a minimum

All information regarding boiler plants is available immediately

upon request. Due to parametric design methods, the optimal

solution can be identified and quoted instantly. This includes

layout drawings for design of the engine room. Aalborg OC is

an advanced composite boiler in standardised design, offering