WÄRTSILÄ HAMWORTHY VOC RECOVERY SYSTEM

During offshore and onshore loading, storage and transportation of crude oil either in on vessels or in oil terminals, crude oil vapors, known as volatile organic compounds (VOCs), are emitted to the atmosphere. The emission can vary between 0.1 kg VOCs per ton of cargo (terminal loading) to 2.8 kg VOCs per ton (offshore loading in bad weather). This will be equal to hundreds of barrels of oil. The emission represents a substantial loss of financial value and destructive consequences to the environment.

The environment impact of these emissions is significant as the emitted gas consists of range of hydrocarbons from methane to higher (typically C6+). Methane is a greenhouse gas with a global warming potential (GWP) of 21 (GWP for CO2 is 1). The non

methane fractions, known as NMVOC, in presence of sunlight react with nitrous oxides and create a toxic ground level ozone and smog layer, which has detrimental environmental effects on vegetation and on human health, particularly on eyes and lungs.

WÄRTSILÄ® is a registered trademark. Copyright © 2015 Wärtsilä Corporation.Specifications are subject to change without prior notice.

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The Wärtsilä Hamworthy VOC recovery system captures the harmful VOC emissions during loading of crude oil, and utilizes it as a valuable light fuel for power generation. This is accomplished by sending vent gas into the VOC recovery system, removing the heavier hydrocarbon fractions (mainly C3+) of the gas by a two stage condensation process before the non-condensable hydrocarbons in surplus gas (mainly methane & ethane) is fed to power generating module; this means 100% VOC Recovery and zero VOC emission. Surplus gas constitutes up to 90% of the energy fed into the power generating module, the rest can be supplied from the liquefied VOC (LVOC) stored in a storage tank. LVOC is a light hydrocarbon fuel which can be applied as clean fuel in power generating modules and inert gas generator units. Wärtsilä Hamworthy VOC recovery system has been successfully utilized on board several shuttle tankers and floating storage units (FSU) in the North Sea.

LIC

LIC

VFD

M

LIC

PTC

Gas Cleaning

Water Spray Pump

Offshore Loading

Oil Terminal Loading

VOCCompressor

VOCCondenser

Sea Water

Separator

Separator

Deck Tank

LVOC Pump

Clean Liquid Fuel

Surplus Gas(Lean Fuel Gas)

Wärtsilä Power Generation/Heat Recovery Solutions

Back to the Cargo TankRe-absorption of LVOC

into the Cargo

Wärtsilä Power Generation/Heat Recovery Solutions

Combined with Wärtsilä Hydrocarbon Blanketing System

FSUs, Shuttle Tankers, Crude Oil Tankers

Cooling Unit

Dryers

Water to Drain

Sea WaterClosed LoopRefrigerant

2nd StageCondenser

2nd Stage CondensationImproved Hydrocarbon Recovery>78% NMVOC Recovery

VOC VOC VOC VOC VOC

Inert Gas Production

Required Fuel: ~16 ton HFO

Sulfur to sea from IG Scrubbing

130,000 TDW

100 - 220 ton NMVOC5 - 20 ton Methane

SO2

NOX

CO2

Inert Gas Production

Required Fuel: ~16 ton LVOC 130,000 TDW

Zero VOC Emission16 tons VOC to Burners for Power Generation/Steam Production

O2

NOX

CO2

VOC Recovery Module LVOC Tank

Without VOC Recovery

With VOC Recovery