Thermische Turbomaschinen

Traupel, Walter

doi:10.1007/978-3-642-96632-3

Cited by 51 publications

(15 citation statements)

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“…The isentropic efficiency of the turbines is calculated from the real data of the existing plant by means of the turbine constant defined here. The turbine constant is a parameter that depends on the turbine mass flow, the inlet temperature as well as inlet and outlet pressure defined as (see e.g., [18]): The plant net output power is 264MW with an efficiency of 33% (LHV).Live steam temperature, pressure and mass flow (point 1 in Figure 1) is 500˝C, 80 bar and 280 kg/s, respectively. The power required to generate such steam is about 756.168 MW, which can be calculated from the enthalpy difference between the economizer inlet and super heater outlet (live steam) multiplied by the mass flow rate.…”

Section: Original Plant Modelmentioning

confidence: 99%

Section: Original Plant Modelmentioning

confidence: 99%

“…ε HRSG " T gas,in´Tgas,out T gas,in´Tambient (18) then the HRSG effectiveness (recovery efficiency) can be calculated as 78.4% and 84.5% for the CC´GT + SF combined cycle respective SOFC-ST hybrid system.…”

Section: Effect Of Sofc Current Density and Utilizationmentioning

confidence: 99%

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Performance Comparison on Repowering of a Steam Power Plant with Gas Turbines and Solid Oxide Fuel Cells

Rokni

2016

Energies

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Abstract:Repowering is a process for transforming an old power plant for greater capacity and/or higher efficiency. As a consequence, the repowered plant is characterized by higher power output and less specific CO 2 emissions. Usually, repowering is performed by adding one or more gas turbines into an existing steam cycle which was built decades ago. Thus, traditional repowering results in combined cycles (CC). High temperature fuel cells (such as solid oxide fuel cell (SOFC)) could also be used as a topping cycle, achieving even higher global plant efficiency and even lower specific CO 2 emissions. Decreasing the operating temperature in a SOFC allows the use of less complex materials and construction methods, consequently reducing plant and the electricity costs. A lower working temperature makes it also suitable for topping an existing steam cycle, instead of gas turbines. This is also the target of this study, repowering of an existing power plant with SOFC as well as gas turbines. Different repowering strategies are studied here, repowering with one gas turbine with and without supplementary firing, repowering with two gas turbines with and without supplementary firing and finally repowering using SOFC. Plant performances and CO 2 emissions are compared for the suggested repowered plants.

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Section: Original Plant Modelmentioning

confidence: 99%

Section: Original Plant Modelmentioning

confidence: 99%

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Performance Comparison on Repowering of a Steam Power Plant with Gas Turbines and Solid Oxide Fuel Cells

Rokni

2016

Energies

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“…The masses for the casing and the shaft are considered in corresponding wall models. The mass flow through the turbine section is calculated by using Stodola's law [4]. Heat transfer between the steam and the casing respectively the shaft is calculated at the inlet volume.…”

Section: Modeling Approachmentioning

confidence: 99%

Simulation of the dynamic behaviour of steam turbines with Modelica

Bimbaum¹,

Joecker²,

Link³

et al. 2009

Linköping Electronic Conference Proceedings

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Steam turbine technology is one of the leading technologies used in electricity production since more than one hundred years. In recent time requirements for steam turbines have been changing slowly. Steam turbines are not longer used in power plants with high operation times and a high full load share only, but are also implemented in combined cycle power plants or solar thermal power plants. This type of plants requires good dynamic behavior of the steam turbine due to fast and frequent start ups and daily cycling.To optimize the performance of this kind of power plants and their components it is necessary to simulate and analyze their dynamic behavior. Therefore, a general model approach for steam turbines within Modelica has been developed. This model approach is based on a general model, which can be adjusted to the necessary model depth as described in this paper.Steam turbines in a solar thermal power plant with direct steam generation must fulfill special requirements regarding their dynamic behavior. Hence, this model is applied as an example to explain the behavior of an industrial steam turbine used in such plants. Furthermore, this paper shows first results of simulations with turbine models. To validate the model, the results are compared with results from the Siemens internal steady state calculation tool. Since results stay within the estimated accuracy, the model approach can be used for further calculations.The dynamic behavior of the turbine is analyzed by using typical solar irradiance disturbances. This analysis shows that no critical operation points occur within the turbine.

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“…The obtained material temperature is then used to get an allowable stress level from a material database. With some simplified beam theory methods [11] a first estimate of the airfoil's radial area distribution and its mass is made possible. Even though this procedure is a good starting point, it has some disadvantages: If the material temperature used for the airfoil design is determined from the mean gas temperatures and the cooling air assumptions only, all uncertainties of the prediction are directly transferred to the allowable design stress and the estimated mass.…”

Section: Introductionmentioning

confidence: 99%

Lifing Requirement Based Turbine Airfoil Mass Estimation Method in Conceptual Aero-Engine Design

Bretschneider

Weisser

Klingels

et al. 2012

Journal of Engineering for Gas Turbines and Power

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For a given material, the target lifetime can be translated into a maximally allowable material temperature and stress level. While the latter has to be maintained by an appropriate mechanical design of the turbine blades, the material temperature needs to be established by sufficient cooling air. The predominant life-limiting effects are taken into account to determine the allowable temperatures and stresses as an accumulation of the varying operating condition over a flight cycle. The applicable stress levels are then used to calculate the necessary radial area distribution of the airfoil and by this a prediction of its mass is possible. Furthermore, the methodology estimates the required amount of cooling air per airfoil cascade from the computed material temperatures. Example calculations are presented and discussed which illustrate design trends and the benefits which are gained from the proposed /úí.The authors want to point out, that the intent of the proposed method is not to deliver an aerodynamic design of the airfoil. The method was developed to enable a more realistic mass estimation Journal of Engineering for Gas Turbines and Power

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Thermische Turbomaschinen

Cited by 51 publications

References 0 publications

Performance Comparison on Repowering of a Steam Power Plant with Gas Turbines and Solid Oxide Fuel Cells

Performance Comparison on Repowering of a Steam Power Plant with Gas Turbines and Solid Oxide Fuel Cells

Simulation of the dynamic behaviour of steam turbines with Modelica

Lifing Requirement Based Turbine Airfoil Mass Estimation Method in Conceptual Aero-Engine Design

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