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PT 11Latest Development in Power Plant Technology Carbon Capture and Storage (CCS) Can it be a Solution for the Future?Reinhardt HassaThe worldwide CO2 emissions have to be decreased to stop climate change. It is both the chance as well as the commitment of the electricity industry to shape the future by working on innovations and technologies that will lead the way. This goal can be achieved when we continue developing our energy mix of renewables, nuclear energy and CCS technologies. We also have to improve our energy efficiency. Dealing with CCS technologies, it goes without saying that a technology not fully researched yet also raises questions. Vattenfall demonstrates with its roadmap and its projects the progress made in the development of CCS technology. Particular Characteristics of Firing Systems in Oxyfuel Steam Generators and Effect on Design and OperationThomas Wild, Steffen Lysk, Frank Kluger and Helmut BischoffThe oxyfuel process is a process variant for the separation of CO2 during the combustion of fossil fuels. The advantage of the oxyfuel process is that the water-steam cycle and the steam generator do not differ significantly from conventional coal-fired power plants. What is new, however, is that an oxyfuel steam generator - owing to its process management - provides more degrees of freedom for the design of the firing system than an air-fired boiler. The design of future oxyfuel steam generators is based on the proven technology of existing conventional coal-fired power plants, theoretical considerations for oxyfuel combustion and the experience from the planning and operation of the 30 MW oxyfuel research plant in Schwarze Pumpe. Intuitive Operator Guidance Supported by Process VisualisationMartin Hollender, Dirk Stevens and Kati LanglotzHuman beings are bound to be the essential decision-maker in the control room and therefore indispensable. In order to support the operator in case of an important incident, to take corrective actions and make the right decisions, the information is to be presented in such a manner which makes it possible to ease problem-solving. Therefore, it is of prime importance to install various measures early in project planning to assemble a reasonable alarm system, and later in continuous operation to improve it as well. With it and in combination with new display types a process visualisation providing intuitive operator guidance is put into practice. Mega Components Made of Cast Steel for Power TechnologyReinhold HanusThe foundry-group of voestalpine with the Austrian locations in Linz and Traisen, produces heavy cast steel components for numerous power plant applications. A weight class between 1 and 200 tonnes can be produced in the foundry group. Each of these markets has its own specific challenge. This paper refers to the speciality, which a steel foundry for heavy parts has to manage in the section of the steam generating plant. We especially want to show this on steam turbines for power plants in the highest operating level (up to 1600 MW). Recommendations for the Inspection of Turbine GeneratorsUlrich Groß and Jörg EmmerichThe publication deals with the 2nd edition of the VDEW Guideline "Recommendations for the lnspection Intervals of Turbine Generators" and takes account of the further opportunities presented by the currently available monitoring and diagnosis systems. Examination methods relevant to various generator components are presented in relation to the various types of inspections. The recommendations for inspection intervals already published in the VDEW Guideline are modified in relation to the influence of on-load operation time, turning gear operation time and the number of starts, in accordance with experience gained and new developments. Furthermore, additional influencing factors on load changes and weaknesses dependending on design or age are proposed. The weaknesses analysis is based on the evaluation of a generator damage database maintained by VGB comprising mainly European power plant operators. Major Steam Turbine Losses - Causes, Repair Measures, RecommissioningStefan Thumm, Martin Eckel and Rüdiger BeauvaisMajor damage on main steam turbine components does not necessarily require replacement of the damaged components. With the application of respective engineering and manufacturing resources a preliminary or final repair can be realised considering the damage causes and therefore preventing repeated damage. Most important, however, is the qualification and experience of all parties involved. The common interest is to keep balance between costs, time requirements and risk. Model-based Process Management and Process Optimisation of Industrial Steam GeneratorsWolfgang Kästner, Rainer Hampel, Tom Förster, Matthias Freund, Dietmar Haake, Heiko Kanisch, Ulrich-Steffen Altmann and Frank MüllerWithin the framework of a joint project sponsored by BMBF the development of algorithms for the optimal process management of industrial steam generators was carried out. The research work was focussed on the reduction of high-temperature corrosion at the membrane walls of lignite-fired steam generators. In the result a system for demonstration of technology was installed successfully in a Vattenfall power plant in 2009. During the operation of the power plant the capability of the system to guarantee a stable and symmetric fire position was demonstrated. Current work is focussed on the further development and retrofitting of the system to apply it under real condition in a Vattenfall power plant. Condition Monitoring, Diagnostic and Controlling Tool for Boiler Feed PumpSohail Ahmed, Reinhard Leithner and Günter KosynaThe boiler feed pump is an important component of a thermal power generation cycle and demands high safety and unquestionable availability for flexible power plant operation. In this research paper, the methodology of a general purpose condition monitoring, diagnostic and controlling tool is presented, which can address the challenges of operational safety and availability as well as optimal operation of a boiler feed pump. This tool not only effectively records the life time consumption of both casings and rotors and monitors the small gaps between casings and rotors but also suggests appropriate actions in order to ensure that the pump operates within the allowable design limits. Weld Repair of a Cracked LP RotorAndreas Nowi, Klaus Herzog, Sorin Keller and Thomas MichalskiIn the West Power Station unit 2, rated at 350 MW consisting of a condensing turbine of MAN design commissioned in 1971, a significant continued increase of shaft vibrations was noticed. Therefore, the turbo set was shut down in order to systematically investigate the root cause of the vibration increase. A weld repair solution was developed during which a new rotor front end was welded to the original truncated rotor body. Details about the damage pattern and root cause as well as repair solutions and repair process including attained welding quality will be presented in this report.
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