Abstracts - VGB PowerTech Journal 10/2007

Future energy challenges in a carbon constrained environment - Fuel flexibility as a growing need

Klaus Payrhuber, Michel Moliere, Marcus Scholz and Robert M. Jones

Energy supply companies and power plant operators must continue to prepare for more complex and more demanding conditions in the future, coupled with a growing need for fuel diversification. The expansion of the range of fuels is making higher demands on power plant manufacturers but also offer the possibility, as presented here, of actually being able to use a larger range of fuels with gas turbines.

The gas turbine process with sequential combustion - Experience, state of development, prospects

Michael Ladwig, Karin Lindvall and Rainer Conzelmann

Alstom’s GT24/GT26 gas turbine is the only one with sequential combustion available on the market. The principle of sequential combustion has been fully developed for the benefit of customers worldwide. In a gas turbine with sequential combustion, after the compressor there is a high-pressure combustion chamber to which a high pressure turbine is connected, followed by the low pressure combustion chamber and the low pressure turbine. This concept offers a solution to the frequent conflict between the requirement of promoting low NOx emissions and high efficiency in modern gas turbines.

Life Time Extension for Siemens gas turbines

Guido Lipiak and Artur Schroeder

The Siemens Life Time Extension (LTE) programme supplies plant-specific solutions for all Siemens V turbines and for older models of W gas turbines in order to guarantee safe operation and a maximum availability of over 100,000 EOH. It includes OEM-recommended measures, qualified component repair and modernisation packages as customised solutions in order to compete on the present and future energy market.

Solar-assisted gas turbine systems - From micro gas turbines to CCGT power plants

Robert Pitz-Paal, Peter Schwarzbözl and Reiner Buck

Coupling solar-generated high temperatures of over 1000 °C to a gas turbine system provides an interesting option for solar power generation. The key components developed have enabled the first demonstration of the entire system in the solar test facility Plataforma Solar in Almería. A study on the potential cost on the scale of a power plant is presented here based on this.

Practical value of a three-stage air filtration system with innovative technology for stationary gas turbines

Thomas Schroth, Andreas Rothmann and Daniel Schmitt

The cleanliness of the combustion air sucked in is increasingly becoming the focus of interest of gas turbine manufacturers and operators as the machines, which are continually being improved, are reacting more and more sensitively to dirt on the blade rows. The comparison of two and three-stage filtration systems for intake air filtration in gas turbines provides important findings on the filter sequence which is most economical.

Fuel flexibility for advanced gas turbines with an output of up to 15 MW: Requirements, design and experiences

Rainer Kurz, Chaur Wen, Luke H. Cowell and John C.Y. Lee

Industrial gas turbines can be operated with a number of different gas and liquid fuels and at the same time maintain low levels of pollutants. At present the use of LNG (liquefied natural gas) and gas turbine operation using fuel gas from various sources and in various compositions are much discussed. The influence of fuel composition on the production of pollutants and the reliable operation of the combustion system is discussed here and measures for preventing problems ahead of projects are explained.

Using non-OEM spare parts in power plant gas turbines

Dietrich Eckardt

Using non-OEM spare parts in power plant gas turbines creates a range of new issues and problems which, given the economic significance of this industry sector against the background of increasing globalisation and more demanding technological enhancements over the coming years, are predicted to become more important. The role of plant insurance in this area is also dealt with.

Retrofit of Schkopau power plant due to decreasing heating values - Retrofitting measures and operating results

Reiner Puls, Dieter Amm, Volker Gehrke and Hellmuth Brüggemann

Units A and B at the Schkopau power plant were put into operation in 1995 and 1996 and are fired by brown coal from the Profen open cast pit in the „Mitteldeutsches Revier“ area of Germany. Due to a drop in fuel heating values the boiler was retrofitted to adapt it to the changed fuel density (9.5 - 10.5 MJ/kg). After retrofitting the two steam generators in 2005, both plants are now able to cope with modified fuel conditions and they reliably meet the tasks demanded of them.

Header-type feed water heaters - Renaissance of superior technology for supercritical power plants

Dirk Band, Thorsten Benten and Jörg Stahlhut

The present expansion of the German and European power plant network with the construction of numerous coal-fired supercritical plants is increasingly placing the focus on the high pressure header-type feed water preheater, since this provides conclusive technical and economic benefits compared to the conventional U tube preheaters. The world’s largest header-type preheaters at present can be found in the new 2 x 1100 MW brown coal power plant at Neurath (BoA 2/3) in Germany.

Classification of waste incineration plants in terms of energy recovery

Michael Beckmann, Ferdinand Kleppmann, Johannes J.E. Martin, Reinhard Scholz and Helmut Seifert

Just recently there have been some intense discussions on when a waste incineration plant is to be classified as an energy recovery plant from a political/legal point of view. The issue is dealt with here from a technical and formal point of view and the conclusions are summarised.

Development of semi-dry waste gas cleaning at the Schwandorf waste incineration plant

Jörg Krüger

Flue gas cleaning plants are not achieving the results of the optimised CDAS facility at the Schwandorf waste incineration plant, which was built in 1992 to replace the Lurgi plant from 1982, in terms of their specific consumption. The experiences, research results and optimisation possibilities are summarised here.