Abstracts - VGB PowerTech Journal 7/2005

Overview of the European Power Plant Portfolio – Global Positioning of the German Power Plant Industry

Heinz Scholtholt

The countries of the European Union are to meet the increasing demand for electric power by means of additional power plant capacity. Furthermore, old power plants must be replaced. However, modernisation of the power plant portfolio will be necessary in the long run. In view of the political demand for a reduction in CO2 emissions and abandonment of nuclear energy, a mix of primary energy sources must be retained for power generation. The corresponding power plant technology is available in Europe and worldwide.

Modernisation of Siemens Gas Turbines as Part of Power Plants Service

Klaus Hermening and Jens Klingemann

During the last years, Siemens Power Generation has made considerable efforts to update the operating fleet of Siemens gas turbines. The new modernisation products take new market situations into account such as privatisation of the electricity market, changing environmental requirements and the globalisation of the energy market. They support power plant owners to operate their gas turbines in a more cost-effective and competitive manner.

Simple Cycle Applications of an Intercooled Gas Turbine

Mike Reale and Narendra Joshi

In the face of unprecedented fuel prices and energy price volatility, players in the power generation industry are rethinking their plans to meet electric load demand growth. The mid-merit power segment or daily cycling segment is growing as a result. The LMS100™ intercooled gas turbine from GE Energy provides electricity generators with a flexible solution to economically address the demands of a mid-merit segment. (EN)

Cost Saving Upgrading of a 55 MW Gas Turbine during Maintenance Work

Klaus Krause

The gas turbine GT 312 of the type GT 13B of the Infracor GmbH Marl failed because of a rubbing damage. A cost-efficient maintenance concept was developed due to the general conditions. This concept comprised simultaneous output optimisation including part load control with adjustable guide row, improved NOx reduction and replacement of the old I&C by a new PROCONTROL P14 system. All these measures were realised successfully and resulted in an upgrade from 55 to 78 MW.

Operational Experience with Variable Stator Blade Positioning

Ole M. Hansen, H. Klemm and U. Dreischhoff

In the future, the currently initiated liberalisation of the energy market will require increased application of new environmentally compatible and at the same time highly efficient power stations. Especially the installation of steam turbines in combined heat and power stations (CHP) is a big challenge for the leading manufacturers of these units. Stator blade-controlled process gas expanders which are operated with aggressive gases at pressures up to 20 bar and temperatures up to 525°C for developing a new extraction control system with variable stator blades have been developed. The new extraction control system offers quite a number of design advantages in connection with increased efficiencies compared to conventional solutions.(EN)

Fenne Co-generation Plant with IC Engines – Electricity and Heat from Mine Gas

Franz-Josef Marx and Edwin Knuth

Within the scope of the “Erneuerbare-Energien-Gesetz” (EEG, act on renewables) the conversion of mine gas (methane) is supported. SaarEnergie AG has erected a co-generation plant with IC-engine at their power plant site in Völklingen Fenne to make use of mine gas. The co-generation plant comprises 14 mine gas-fired engines with an electrical and thermal capacity of 3 MW each, summarising to a electrical capacity of 42 MW. The planning, plant configuration and technical data as well as first operating experience with the engine co-generation plant are described.

Current Loss Experience with Gas Turbines

Johannes Stoiber and Stefan Thumm

Current examples of loss occurrence that are investigated at the Allianz Center for Technology (AZT) in order to establish causes and appropriate remedies are described. The loss experience of the past few years shows a decreasing trend towards serial losses that occurred in the past as a result of deficient design. In the recent past an accumulation of gas-turbine damage has been observed following inspection and/or repair. In all the cases shown, proper quality-assurance measures would have prevented the damage.

Technologies for Gas Turbines of Future Generations

Dieter E. Bohn

The collaborative research center 561 (SFB 561) “Thermally highly loaded, porous and cooled multi-layer systems for combined cycle power plants” is aiming at elaborating current technological and scientific insights and at establishing new scientific foundations, so future combined cycle power plants will be able to reach total efficiencies of about 65 % after the year 2025. This entails developing new technologies for the gas turbine of such a combined cycle power plant, with which current combustion chamber outlet temperatures can be increased significantly.

The Power Station Portal from Handling to Operation Management – from Control Room to Headquarters

Jörg Orth and Stefan Lauxtermann

A power plant portal allows power and heat producers to make use of all the functionalities already available, while benefiting from the convenience of a consistent user interface philosophy. The system's range of functions by far exceeds the capabilities of traditional operating and monitoring systems and effectively integrates the procedures of information management, engineering and asset optimisation. Users have context-based direct access to plant- and company-wide information. A wide variety of PCS, DCS and power plant components can be monitored with the help of the integrated software modules. Asset optimisation features enable plant owners to minimise the costs of corrective and preventive maintenance measures. In addition, they support and optimise the workflow of maintenance and calibration activities.

Shortening of Downtime Through Optimum Bolted Connection

Ulrich Oehms

Gas turbines require more frequent maintenance intervals than other types of turbines and therefore the downtime should ideally be as short as possible. The bolted connections of a turbine play an important role in the length of downtime required since they affect the time needed for opening and closing of the unit. Gas turbine manufacturers and operators are not completely satisfied with the present methods of bolting available, controlled torque application or hydraulic stretch tension-in. The three part mechanical clamp (tensioning element) solves this problem by combining the advantages of torque and tensioning without the disadvantages of either.

Removal of Sulphur-nitrogen Compounds from FGD Waste Water by Ozone Treatment

F. Fogh, E. Smitshuysen, S. Wolff and M. Koivisto

For five years the Elsam power station situated in Esbjerg has used spray dry absorption product (SDAP) from the semi dry FGD units as an absorbent in the wet FGD unit. This has given considerable improvements. The use of SDAP in the wet FGD has, however, given some waste water problems. SN compounds are extracted from the SDAP into the waste water of the wet FGD unit and have to be removed from the waste water. Elsam together with Air Liquide A/S developed and operated successfully a pilot plant for the treatment of 1 m3/h FGD wastewater with ozone. (EN)

Chemical Operation Experience with the CCPP Cottam

M. Rziha and B. Senger

The CCPP Cottam HRSG (Heat Recovery Steam Generator) is a new development in that it incorporates both drum type and once through evaporators. This system requires different chemistries to be applied to the LP and the HP/IP evaporator water/steam circuits in order to minimize corrosion of the plant, transport of corrosion products around the water/steam cycle and deposition of impurities within the water/steam cycle. (EN)

Corrosion Damage at a Steam Generator Operating as Contracting Plant in the Industry

Hubertus Winter and Karl-Eugen Gaisser

Within the scope of contracting models the EnBW Energy Solutions Ltd (EnBW ESG) is planning, constructing and managing energy plants and area networks for customers and is supplying utility energies like heat, cooling energy, compressed air und technical gases. During operation of the contracting plants since 1997, the ESG has gathered a number of experiences. Some of these experiences should be presented in the lecture, i.e. differences between steam generators in pure power stations and in the industry, site specific problems, history and damage symptoms, cause study and troubleshooting.

Securing a Process Management System Against Hard Disk Failure

Armin Schlösser and Uwe Siebert

The widespread use of PC technology in process management is closely coupled to the question what happens in case of a hard disk crash? This article examines which types of data need to be backed up. The example shows that in a PMS fitted with an automatic backup and recovery system, the replacement of a computer involves little more than a simple exchange of hardware.

Lectures designated by (EN) are published in the English language.