Barge Mounted Power Plant with 8 Units Wartisila 18V-46GD Generator

Manufacturer: Wartsila Finland and Ariel Corporation USA
Year of Manufacture: 1998
Type: Used
Location: South East of Dhaka City, Bangladesh
Notes:

• Complete barge mounted Power Plant 110mw
• Wartsila 18V-46-GD x 08 units with BARGE complete ship running condition.
• BUILT OF BARGE : 1999.

Barge Mounted Power Plant with 8 Units Wartisila 18V-46GD Generator Details

Introduction

NEPC Power Plant is a 110MW diesel engine power plant commenced commercial operation in June 1999 and generates power through eight units of Wartsila Vaasa diesel engines which carries a capacity of 16.3MW each unit. The plant is currently operating on a cyclic profile, according to peak demand with despatch from the national grid of Bangladesh.

NEPC Power Plant has been constructed on a floating barge, anchored at the Shitalakshya River, 1 kilometer downstream of the Katchpur bridge and 35 kilometers from Dhaka City. The plant is approximately located at geographical coordinate (23°41'11.0"N 90°31'43.5"E), circa 25.5km from Dhaka, capital of Bangladesh. Travel by road is likely to take 1.5 hours to the power plant. Road access to the site is narrow with only single direction movement for vehicle and it is constructed of sandy mud road branching from the main public road. The road to the Power Plant will pass through some residential houses prior to reaching the dual gated and guarded Power Plant. The site is adjacent to the EGCB 420 MW New Haripur Power Plant as well as the 360 MW HPL GT Combined Cycle Plant and opposite the 50 MW Siddhirgonj BPDB Thermal Power Station. The nearest highway to the plant is the Dhaka – Chittagong Highway. The nearest seaport is Chittagong which is about 200 km away and the nearest airport is Dhaka International Airport which is about 40 km away.

Power Plant

The NEPC Power Barge entered commercial operation in June 1999 has a capacity of 130 MW with a PPA contracted output of 110MW. The power barge was constructed in China with 8 Units of dual fueled Wartsila Engine as prime mover which fires on both Heavy Fuel Oil and as well Compressed Natural Gas (“CNG”) to generate electricity through shaft connection to a ABB generator through 500 rpm speed. Electricity, 15kV at 50Hz, generated by the 8 Units of Wartsila Engine, ABB Generator is delivered to 2 ABB Main Step-up Transformers on board of the barge.

Black Start Generator and UPS

The power barge is equipped with an emergency diesel generator to ensure power supply to all essential plant support system when the plant is isolated from the grid to facilitate the starting of the plant from cold without back feed from the grid. The black start generator is connected with the Black Start Bus BFA-900. The power required for necessary auxiliary equipment to start two engine generators, namely Unit #2 and Unit #7 on fuel oil from cold condition is supplied from the black start bus.

The plant is provided with 110V and 24V battery system for power back up in case of blackout. The battery systems are redundant and connected to a redundant battery charger.

Fuel Handling

Heavy fuel oil is currently in used. The heavy fuel oil is delivered directly to the storage tanks on board the barge by tank vessels. The tank vessel, carrying the heavy fuel oil, is moored alongside the power barge on the river side. The barge is able to store all the heavy fuel oil utilizing its 5 fuel oil storage tanks, each with a capacity of 500 MT.

Although the engine supports fuel gas firing as primary fuel for operation, fuel gas is not in used since 2010 because of the fuel gas supply instability. A purpose built fuel gas compressor station was installed on site for fuel gas handling.

Layout and Construction

The NEPC Power Plant is permanently moored on the northern side of the river Sitalakhya in area named Haripur, 1 km downstream of the Katchbur Bridge and 35 km northeast of the main capital Dhaka, Bangladesh.

The power plant facility comprises of one floating power barge, gas compressor house / auxiliary equipment, office and storage buildings together with a comprehensive workshop.

Access to shore from the barge is enabled by gangways arranged to facilitate differences in sea water level. Power cables are arranged from one end of the power barge leading to an adjacent switch yard. Consequently, the power cables are not passing over the storage buildings inside the plant site. On the river side of the barge, there is a mooring arrangement and bunker station for the regular supply of fuel oil. The fuel oil pipes are arranged on the outside of the power barge and further distributed to the individual 5 storage tanks.

There is also a gas compressor station, where the natural gas is received via a pipe line from the LNG storage facility. This gas station compresses the natural gas pressure up to 360 bars before it is distributed through a single wall stainless pipe line to Commodore I before being consumed by the engine generators. The power plant is currently not operating on gas and has not been doing so since year 2010 due to shortage supply of gas.

Project Summary

• Barge: Haripur Commodore I
• Location: Haripur, Narayanganj, Bangladesh
• Start Date Barge Construction: 15 October 1998
• Commercial Operations on HFO: 29 June 1999
• Commercial Operations on NG: 03 October 2000
• Technology: Reciprocating four stroke engines, dual fuel mode (Wartsila 18V46GD)
• Number of Units: 8 Diesel Engines coupled to 8 ABB Generators, 4 high pressure Main compressors, 1 high capacity Booster gas compressor
• Manufacturer: Wartsila Finland and Ariel Corporation USA
• Fuel: Natural Gas (“NG”) and Heavy Fuel Oil (“HFO”)
• Net Saleable Capacity: 120 MW HFO / 115 MW Natural Gas
• Other Features: Barge Mounted Plant (300ft x 100ft), Radiator cooling, Onboard Fuel/Lube oil storage

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