Gas Turbine v. Diesel Debate Heats Up With Delivery of New Millennium

Friday, July 14, 2000
Since Royal Caribbean decided to embrace the advanced marine propulsion technology inherent with gas turbines, power plants aboard cruise ships built and delivered in the new millennium could be much different. Even if all newbuilds do not incorporate gas turbine power, other propulsion suppliers such as diesel manufacturers will be driven by this new competitor in a previously diesel dominated domain — along by new and increasingly stringent environmental emission requirements — to continuously improve their designs in order to meet future needs.

Owners and shipyards will be concentrating heavily on the following power plant issues when considering new ship designs:

Space Utilization Royal Caribbean and Celebrity selected a COmbined Gas turbine and Steam turbine Electric drive System (COGES) for their new ships. This system, based on GE's LM2500+ aeroderivative gas turbine, was chosen because RCI was committed to using gas turbines for 100 percent of the ship's normal operational power requirements. The only diesel power aboard will be two small high-speed units to provide emergency standby and auxiliary power when the main gas turbine units are not in operation.

The efficient space utilization of the COGES package added 50 passenger cabins as well as additional public space — an obvious valued-added design feature for RCI.

In contrast, Holland America Cruise Line selected a COmbined Diesel And Gas (CODAG) turbine configuration for four new cruise ships. One LM2500 aeroderivative gas turbine-generator set will be applied per ship, operating in parallel with one or more of the diesel generators on board. This configuration will allow the vessels to operate in environmentally sensitive areas using clean gas turbine power.

These two configurations illustrate the flexibility of GE's LM fleet of aeroderivative gas turbines. Currently 27 navies use 968 engines on 388 ships. In the commercial marine arena, 82 GE LM gas turbines can be found on 45 ships, in various hull configurations, and in both mechanical and electric drive propulsion systems.

Environmental Concern A major driver for Royal Caribbean and Holland America was the desire to make a statement to the world about their concern for the environment.

The COGES plant being installed on the Royal Caribbean and Celebrity ships will produce only 5.0 g/kWh NOx at 47 MW without any emission reduction systems. By using GE's Dry Low Emission system for the LM2500 and 2500+, NOx can be reduced to less than 1 g/kWh. The engine controls monitor emissions on-line and adjust fuel burn automatically to maintain preset levels of both NOx and CO.

Passenger Comfort Passenger comfort is also a major concern in the cruise industry. The lightweight design of the gas turbine with its high-speed balanced rotating assemblies and continuous combustion process allow it to operate with minimal vibration signature. Airborne noise emitted from the gas turbine genset is limited to 90 dBa by the sound attenuated enclosure around the gas turbine. Exhaust noise normally requires no silencing.

Reliability/Maintainability A gas turbine that is readily available for service is crucial in all marine environments. GE's products are proven, in that the parent aircraft engines from which the LM gas turbines were developed have more than 216 million reliable operating hours on various aircraft. For instance, through more than 300 GE Component Improvement Program initiatives, extensive reliability and maintainability advancements have been made to the LM2500. This program includes the infusion of advanced materials, coatings, improved bearings and electronic fuel control. A continuous improvement has been demonstrated. In fact, when the LM2500 was introduced almost 25 years ago, the incidence of engine removal was estimated at 5,000 hours. U.S. Navy data shows that the removal interval for earlier versions of the LM2500 exceeds 18,000 hours and the most recent versions exceed 23,000 hours.

Maritime Reporter March 2014 Digital Edition
FREE Maritime Reporter Subscription
Latest Maritime News    rss feeds

People & Company News

Schlumberger Announces Q1 Results

Schlumberger Limited (NYSE:SLB) today reported first-quarter 2014 revenue from continuing operations of $11.24 billion versus $11.91 billion in the fourth quarter of 2013, and $10.

Russia Ships First Oil From Offshore Arctic Platform

President Vladimir Putin hailed Russia's first shipment of Arctic offshore oil on Friday, saying the platform decried by environmentalists will help Moscow expand its global energy markets share.

Shipping Turns From Banks to Equity Markets for Cash

Shipping companies are turning to equity markets to fill a growing funding gap, betting that investors hungry for decent returns will provide capital to a sector

Marine Propulsion

RS at SEA JAPAN 2014

Russian Maritime Register of Shipping (RS) was the only Russian company to take part in SEA JAPAN 2014 exhibition and conference – one of the major exhibitions of the maritime industry.

Havyard to Build Hybrid Battery Arctic PSV

Norway's Havyard says it has signed a contract for the construction of a Havyard 833 WE ICE platform supply vessel with Fafnir Offshore HF. The vessel is to be

GE Gas Turbines Power USS America

GE Marine reports that the United States Navy’s future USS America (LHA 6) amphibious assault ship recently completed successful acceptance sea trials powered by two GE LM2500+ marine gas turbines.

 
 
Maritime Careers / Shipboard Positions Maritime Standards Navigation Offshore Oil Pipelines Port Authority Salvage Shipbuilding / Vessel Construction Sonar Winch
rss | archive | history | articles | privacy | contributors | top maritime news | about us | copyright | maritime magazines
maritime security news | shipbuilding news | maritime industry | shipping news | maritime reporting | workboats news | ship design | maritime business

Time taken: 0.1186 sec (8 req/sec)