terma logo - MARINE BOILER ON A LNG TANKER

CASE STUDY

MARINE BOILER
ON A LNG TANKER

MALAYSIA

MARINE BOILER ON A LNG TANKER

2 Babcock Marine Boilers
Problem

A LNG vessel, fitted with two Babcock Marine
Boilers to generate steam to drive the
propulsion and steam turbines, experienced
heavy deposits in the Combustion and Radiant
sections of the boilers.

After Therma-Chem Treatment

Therma-Chem’s MB9 was applied on-line on a
pre-docking dosing programme for a period
of 2 months to loosen deposits and neutralise
the corrosive components prior to docking.
The pictures on the right show the condition of the economiser before and after cleaning,
highlighting the success of MB9 in removing
and preventing sulphur corrosion.

The boiler load remained steady throughout
the period while the economiser outlet
temperature declined slightly, indicating that
Therma-Chem were having a positive effect on
the boiler.

The success of this treatment was evidenced
in the clean and well-maintained surfaces
within the Combustion and Radiant sections of the boiler and the reduced cleaning time when docked. This resulted in Therma-Chem being commissioned to treat a further 15 vessels.

Before Injection
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After Injection
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marine mid3 - MARINE BOILER ON A LNG TANKER
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Vacuum Tar Residue
and Fuel Gas Fired Boiler

Japan

High flue gas temperatures
and APH corrosion

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HFO Fired Boiler

Saudi Arabia

Poor boiler efficiency and high
CO2 emissions

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Coal Fired Boiler

Romania

Loss of boiler efficiency and
high CO2 emissions

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Gas and HFO
Fired Boilers

Egypt

Efficiency loss due to fouling on
superheaters and economiser

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Expander in FCC Unit

South Korea

Catalyst deposits on rotating
blades causing severe vibration

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Shipping – LNG Tanker

Malaysia

Heavy deposits on combustion
and radiant sections of boilers
as well as back-end corrosion

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Process Heater

Belgium

Heater temperature limited
due to fireside conditions

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Process Heater

Singapore

Radiant temperature and
heater duty limited by fouling

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Gas Fired Reformer

UK

Unsustainable flue gas
temperature increase
due to fouling