GESAB - Maritime Exhaust Gas Heaters

Located Gothenburg, the maritime center of Scandinavia, GESAB has over 40 years of experience in delivering heating systems for marine application. GESAB’s quality products provide cost effective and competitive solutions to the heating needs in all types of ships. i.e. tankers, OBO carriers, reefers, passengers ships, container ships, drilling rig’s and military vessels. GESAB’s products are distributed worldwide and built in own factories in Sweden, Germany or China.

GESAB thermal oil heaters

GESAB - HTI Thermal Oil Heaters are built according to and the Classification Societies’ rules for pressure vessels. The heater is designed as a radiating heater with a succeeding convection heating surface and constructed as a triple-pass flue gas system.

The forced circulation heaters of vertical or horizontal design are available for outputs of 200-20000 kW. Thermal Oil Heaters, with at heating capacity of 800 kW and upward, can use heavy fuel oil burners (viscosity to 700 cSt at 50 C). On request, we can supply and heaters designed for combustion of waste oil and sludge.

Generated heat, by oil or gas flame will be transferred to the thermal oil system through helically wound heating sections inside the heater. Within the inner section – the combustion chamber – the heat is transferred by radiation and in the outer section by convection.

GESAB exhaust gas heater (economizer) range 100-5000kW

The Exhaust Gas Heater, heated by waste gases from the vessel’s main engine, is commonly used in satisfying the heat demand of the vessel’s bunker heating, accommodation, calorifier water and pre-heaters during the voyage. It may also be sufficient to heat the cargo, subject to heat requirement.

Design and construction of marine economizers

The heating surface of the economizer consists of a number of spirally wound heating sections which are connected in parallel to a common inlet and outlet manifolds. The high speed of gas flue outside the smooth tubes, create a self cleaning effect.

Inside the economiser, there is water fed ring lines, fitted with nozzles, for both cleaning of the economiser and for fire extinguishing purposes.

The lower gas flue transition piece is designed as a water trap to prevent extinguishing water to penetrate into the exhaust gas ducting from the main engine.

An integrated two flue gas damper section may be installed to modulate the output. Depending on the heat demand the flue gases are by-passed or led through the heating section.

By directing the exhaust gases to either go through, or to bypass the heater, the heat output can be modulated according to demand.

Advantages include:

• Reliable, no permanent supervision required.
• Precise control and monitoring of temperature and capacity
• Efficient modulation of output from 15% to 100%
• Excellent self-cleaning combustion chamber and tube area design, using high speed exhaust
• Plain boiler pipes made of certified steel
• Optimal adaption of physical design to confined spaces
• High operational safety by exclusive use of high-quality components and safety devices. Heat surface load is calculated to prevent overheating, or cracking, of the heat carrying oil
• Fully automatic operating mode with trouble free operation
• No corrosion in heaters, pipe lines and heat consumers, or other damages normally associated with steam heating systems.
• No damages caused by freezing during shut-down periods in low temperatures.
• Interconnection of several heaters and consumers possible
• Different temperatures at consumers in secondary circuits
• GESAB/HTI-exhaust gas heat exchangers are suitable for operation with thermal oil or water
• When operating with hot water, steam can be produced by using steaming-out cylinders