Economic and adequate inerting

MP Flue Gas Systems

These systems cool and clean flue gas available from the ship’s boilers and distribute the gas to the cargo tanks, typically during cargo discharge

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MARITIME PROTECTION FLUE GAS SYSTEM

Flue gas is passed through the scrubber for cleaning and cooling before entering the cargo tanks. The type of scrubber used is important with regards to efficiency of extraction of soot and SO2. A poor scrubber will produce poor inert gas which again will cause corrosion and settlement of soot in the cargo tanks. With an efficient scrubber, the use of the inert gas will reduce the corrosion in the tanks considerably. A scrubber with an outside venturi section equipped with an adjustable venturi has proven itself to be most efficient. The venturi section ensures an optimal soot extraction of all the different grades of soot particles during all running conditions

KEY FEATURES

  • Flue gas from ship boilers are used to produce clean and soot free inert gas
  • Efficient cooling by precooler and scrubber tower
  • High pressure centrifugal blowers positioned downstream flue gas scrubber provide inert gas to cargo tanks
  • System capacity is automatically controlled by deck pressure set-point in software
  • Maritime Protection Pressure Vacuum Breaker ensure safe loading and off loading
  • Maritime Protection Deck Water Seal ensures safe sealing of inert gas and prevent back flow of cargo gases to safe area
  • The most economic and adequate way to produce inert gas on board is to make use of the flue gas from the ship boilers.

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TECHNICAL INFORMATION

SYSTEM DESCRIPTION

Scrubber process

Flue gas from the boilers form the basis for the inert gas production. The hot and dirty gases are drawn into the precooler where the first step is to cool the flue gas before entering the flue gas scrubber where second stage cooling and cleaning take place. The cooled and cleaned inert gas is then distributed to cargo tanks by high pressure centrifugal blowers. Before entering the cargo tanks the inert gas must pass the deck water seal which prevent backflow of cargo gases. Gas freeing can be performed by closing the scrubber isolating valves and open the fresh air valve, the system can be used to gas free the cargo tanks after inerting. The different modes (IG and fresh air) can easily be selected in the LCD control panel.

Scrubber plant 

  • Precooler with water injection, this stage cools the high temperature flue gas.
  • Venturi scrubber removes the soot particles. It is possible to manually adjust the venturi pressure drop. When soot particles are greater than 1micron the soot extraction efficiency will be higher than 98.5%. After leaving the venturi scrubber the inert gas is bubbled through a water bed before entering the washing tower.
  • Washing tower cools and effective removes the SO2 Packed bed sections ensure a large surface contact area between water and gas for maximum extraction of SO2 from the flue gas. Drop eliminator mounted in top of washing tower to prevent free water entering the inert gas supply piping.

Operation & Maintenance

  • Graphical LCD operator terminal. All major process parameters displayed on the screen
  • The Flue gas already contains less than 5% oxygen and no further treatment is therefore necessary
  • Easy inspection and easy replacement of scrubber components by entering man hole

Options

  • Multiple LCD operator terminals
  • System signal and operation available for ships IAS via MODBUS or ETHERNET communication
  • Topping up generator (TUG) MPG 400 (500 m³/h).

 

SYSTEM APPLICATIONS

Crude Oil Carriers (VLCC, ULCC) for cargo tanks and pipes

Survitec Flue Gas Generator Vessel

SPECIFICATIONS

Scrubber capacities, size and weight

Type

Capacity Range [m3/h]

Height 
[mm]

Length [mm]

Width [mm] 

Weight [kg] 

FGS 1000

2000-5000

4100

1950

1000

2000

FGS 1400

5000-10000

4450

2510

1400

2550

FGS 1600

10000-15000

4600

2830

1600

2900

FGS 2000

15000-23000

5000

3740

2000

3300

FGS 2200

23000-28000

5000

4300

2200

5000

 

 

RULES AND REGULATIONS

The Maritime Protection Inert Gas Systems are built in accordance with 1974 SOLAS Convention with latest amendments, and are fulfilling all of Class, IMO’s guidelines and the demanding conditions of shipboard operation.

Survitec Flue Gas System Approvals

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