Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Fuel Prices and Environmental Charges Slow down the Speed of Ships

24.09.2008
Shipping Companies Look to new Propulsion Concepts and the Recovery of Energy from Ship Exhaust Gases

Challenged by high energy costs and rising environmental requirements, more and more shipping companies are looking to new propulsion concepts as a solution to their problems. They are now focusing their strategic decisions on saving energy, reducing emissions and optimizing engine size instead of speed.


Diagram showing how the energy from a ship\'s exhaust gases is used

“Shipping companies are rethinking their position”, explained Ernst-Christoph Krackhardt, who works for Siemens Marine Solutions and is responsible for merchant shipping. “They are deciding in favor of less powerful but more efficient and more cost-effective engines for their ships. To this end, all potential sources of energy such as exhaust gases are being utilized for efficiency increase.”

High fuel prices, investment security, carbon certificate trading and port registration are the issues that are confronting shipping companies and dockyards today and are influencing the construction of new ships. On the one hand, operating costs can be lowered substantially if the speed of a ship is reduced. For example, if a container ship drops its speed from 25 knots to 20 knots, fuel costs fall by up to 40 percent. The engine power needed to propel the ship also falls correspondingly. In future, this will allow for lower-powered engines. “On the other hand”, said Krackhardt, “the solutions developed by Siemens for recovering energy from ships' exhaust gases - waste heat recovery systems - result in a considerable improvement in the energy balance, especially when they are combined with booster drives.” These solutions can be incorporated at the design stage for new ships and can also be retrofitted in existing ships at an acceptable conversion cost. In the case of 8 ships belonging to a Danish shipping company, fuel consumption was reduced by well over ten per cent per ship solely through the use of the ship's exhaust gases to produce electricity. “From a ship's exhaust gases, we generate up to 9 MW of electricity which can be fed into the on-board power system and/or used for the booster drive, an electric motor mounted on the propulsion shaft in order to increase propulsion power”, said Krackhardt.

The way a waste heat recovery system works is to use the energy contained in the hot gases from a ship's diesel engines to produce steam in downstream waste-heat boilers and thus drive turbo-generators that generate energy for the on-board power supply system rather than allow the energy in the exhaust gases to escape into the atmosphere through the ship's funnel. Additional electrical power can also be generated/emitted with the generator/motor which is mounted directly on the propeller shaft. If the output of the main propulsion unit is not being fully utilized, this shaft generator can make electrical energy available to the on-board power supply system, thus placing a greater burden on the main engine. This results in more exhaust-gas energy being generated less expensively, which makes it possible to significantly reduce the operating times of the on-board diesel generator. Moreover, the shaft generator can be used as an electric motor to increase the overall propulsion power of the ship, thus producing a higher speed when necessary. On top of all this, the shaft generator can be used in motoring mode as the sole means of propulsion during maneuvers in harbors or at slow speeds. During these maneuvers, the main propulsion unit (usually a large diesel engine) can even be switched off and uncoupled from the shaft. All the functions are controlled by means of an energy management system which automatically adapts the available energy and operation of the shaft generator/motor to current requirements, while making optimum use of this energy. The waste heat recovery system enables flexible generation and use of electrical energy. The energy management system optimizes the efficiency of the main engine and reduces the operating times of the generator sets and thus their operating and maintenance costs. Dockyards can integrate the waste heat recovery system in order to design a main engine with a lower rating and thus use the engine room more flexibly as the shaft generator is installed in the existing propulsion shaft tunnel and does not therefore require any additional installation space.

Given the current high prices for fuel, Krackhardt calculates that retrofitting a waste heat recovery solution is an investment that pays for itself within a mere two and a half years. “If a ship has a useful life of 25 to 30 years, this is definitely worthwhile – for both ship-owners and the environment. It also creates the option of being able to enhance the carbon trading scenario to the benefit of everyone involved.”

Further information on solutions for merchant shipping and the navy at:
http://www.siemens.com/marine
The Siemens Industry Sector (Erlangen, Germany) is the world's leading supplier of production, transportation and building systems. Integrated hardware and software technologies combined with comprehensive industry-specific solutions enable Siemens to enhance the productivity and efficiency of its customers in industry and infrastructure. The Sector comprises six Divisions: Building Technologies, Industry Automation, Industry Solutions, Mobility, Drive Technologies and Osram. In fiscal 2007 (ended September 30), Siemens Industry generated sales of approximately EUR40 billion (pro forma, unconsolidated) with around 209,000 employees worldwide. http://www.siemens.com/industry With the business activities of Siemens VAI Metal Technologies, (Linz, Austria), Siemens Water Technologies (Warrendale, Pa., U.S.A.), and Industry Technologies, (Erlangen, Germany), the Siemens Industry Solutions Division (Erlangen, Germany) is one of the world's leading solution and service providers for industrial and infrastructure facilities. Using its own products, systems and process technologies, Industry Solutions develops and builds plants for end customers, commissions them and provides support during their entire life cycle.

Wieland Simon | Siemens Industry Solutions
Further information:
http://www.siemens.com/marine
http://www.siemens.com/industry-solutions

More articles from Power and Electrical Engineering:

nachricht Supersonic waves may help electronics beat the heat
18.05.2018 | DOE/Oak Ridge National Laboratory

nachricht Researchers control the properties of graphene transistors using pressure
17.05.2018 | Columbia University

All articles from Power and Electrical Engineering >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Explanation for puzzling quantum oscillations has been found

So-called quantum many-body scars allow quantum systems to stay out of equilibrium much longer, explaining experiment | Study published in Nature Physics

Recently, researchers from Harvard and MIT succeeded in trapping a record 53 atoms and individually controlling their quantum state, realizing what is called a...

Im Focus: Dozens of binaries from Milky Way's globular clusters could be detectable by LISA

Next-generation gravitational wave detector in space will complement LIGO on Earth

The historic first detection of gravitational waves from colliding black holes far outside our galaxy opened a new window to understanding the universe. A...

Im Focus: Entangled atoms shine in unison

A team led by Austrian experimental physicist Rainer Blatt has succeeded in characterizing the quantum entanglement of two spatially separated atoms by observing their light emission. This fundamental demonstration could lead to the development of highly sensitive optical gradiometers for the precise measurement of the gravitational field or the earth's magnetic field.

The age of quantum technology has long been heralded. Decades of research into the quantum world have led to the development of methods that make it possible...

Im Focus: Computer-Designed Customized Regenerative Heart Valves

Cardiovascular tissue engineering aims to treat heart disease with prostheses that grow and regenerate. Now, researchers from the University of Zurich, the Technical University Eindhoven and the Charité Berlin have successfully implanted regenerative heart valves, designed with the aid of computer simulations, into sheep for the first time.

Producing living tissue or organs based on human cells is one of the main research fields in regenerative medicine. Tissue engineering, which involves growing...

Im Focus: Light-induced superconductivity under high pressure

A team of scientists of the Max Planck Institute for the Structure and Dynamics of Matter (MPSD) at the Center for Free-Electron Laser Science in Hamburg investigated optically-induced superconductivity in the alkali-doped fulleride K3C60under high external pressures. This study allowed, on one hand, to uniquely assess the nature of the transient state as a superconducting phase. In addition, it unveiled the possibility to induce superconductivity in K3C60 at temperatures far above the -170 degrees Celsius hypothesized previously, and rather all the way to room temperature. The paper by Cantaluppi et al has been published in Nature Physics.

Unlike ordinary metals, superconductors have the unique capability of transporting electrical currents without any loss. Nowadays, their technological...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

Save the date: Forum European Neuroscience – 07-11 July 2018 in Berlin, Germany

02.05.2018 | Event News

Invitation to the upcoming "Current Topics in Bioinformatics: Big Data in Genomics and Medicine"

13.04.2018 | Event News

Unique scope of UV LED technologies and applications presented in Berlin: ICULTA-2018

12.04.2018 | Event News

 
Latest News

Supersonic waves may help electronics beat the heat

18.05.2018 | Power and Electrical Engineering

Keeping a Close Eye on Ice Loss

18.05.2018 | Information Technology

CrowdWater: An App for Flood Research

18.05.2018 | Information Technology

VideoLinks
Science & Research
Overview of more VideoLinks >>>