High Temperature Turbine Design Considerations

1970 ◽  
Vol 42 (12) ◽  
pp. 10-17 ◽  
Author(s):  
S.N. Suciu
Keyword(s):  
High Temperature ◽  
Design Considerations ◽  
Turbine Design

Steam Turbine Design Considerations for Ultrasupercritical Cycles

2010 ◽  
Author(s):  
Justin Zachary
Keyword(s):  
Power Generation ◽  
Cost Effective ◽  
Design Phase ◽  
Steam Turbines ◽  
Effective Solution ◽  
Technical Approach ◽  
Design Considerations ◽  
Balance Of Plant ◽  
Turbine Design ◽  
The Impact

The current coal-fired power generation market requires higher cycle efficiencies not only for economic reasons, but also as a means of reducing plant carbon footprint. To achieve these goals, the plant must operate at higher pressures and temperatures in the supercritical (SC) and ultrasupercritical (USC) domains. This paper describes Bechtel’s experience and challenges in regard to the conceptual design and integration of large steam turbines operating under these severe conditions. Several examples of projects are described wherein Bechtel applied this neutral but proactive technical approach in the development or design phase to achieve the best and most cost-effective solution for its customers. The topics presented also relate to steam cycle optimization in terms of plant output, steam conditions, number of reheat circuits, and type and number of heaters. The impact on balance of plant systems, including water treatment, availability, and redundancy criteria, is also addressed.

scholarly journals Time Between Overhaul vs Premature Removal Rates as Turbine Design Considerations

1980 ◽  
Author(s):  
C. E. Curry ◽  
A. C. Wei
Keyword(s):  
Removal Rate ◽  
Utilization Rate ◽  
General Knowledge ◽  
Removal Rates ◽  
Aircraft Flight ◽  
Design Considerations ◽  
Turbine Design ◽  
Premature Removal ◽  
Insight Into

A general knowledge of aviation practices constituted the background for the identification of three distinct variables as the major drivers for engine removals in the operation of an aircraft. This study provides an insight into the interrelationships of the major drivers which determine engine removals for an aircraft: utilization rate (U), time between overhaul (TBO), and premature removal rate (PRR). Each of these elements is of concern to nearly every aircraft operator. For this study, it was assumed to be the same as aircraft flight hours per month.

Design Considerations for Reliable High Temperature Operation of Wet Electrolytic Tantalum Capacitors

2014 ◽  
Vol 2014 (HITEC) ◽  
pp. 000103-000111 ◽  
Author(s):  
Jeremy Ladd
Keyword(s):  
High Temperature ◽  
Internal Pressure ◽  
Current Flow ◽  
Hydrogen Gas ◽  
Ambient Conditions ◽  
Design Considerations ◽  
Electrical Stress ◽  
Temperature Performance ◽  
Reliable Performance ◽  
High Temperature Operation

Wet electrolytic tantalum (Ta) capacitors have historically been utilized in a variety of applications which endure harsh ambient conditions. Thermal, electrical and mechanical stresses, though, pose significant challenges to reliable performance of these capacitors in such environments. Thermal stress can increase the internal pressure of the capacitors, as well as mechanically compromise some of the components of which the capacitors are comprised. Electrical stress, in the form of current flow due to applied voltage, can elicit hydrogen gas evolution, which further exacerbates the internal pressure issue, potentially embrittles Ta components, and degrades AC performance of the capacitors. Mechanical stress, resulting from shock and vibration for example, can jeopardize the internal mechanical integrity of the capacitors. This paper elaborates on these obstacles, and offers design approaches to reliably overcome them. Also presented are results of high temperature performance, predominantly up to 230°C, but also a mention of limited 245°C results, of wet Ta capacitors manufactured with proper attention paid to these concerns.

High-temperature Alloys in Relation to Gas-turbine Design

1952 ◽  
Vol 166 (1) ◽  
pp. 123-130
Author(s):  
K. L. Buckle
Keyword(s):  
Heat Treatment ◽  
High Temperature ◽  
Gas Turbine ◽  
Temperature Effects ◽  
Material Selection ◽  
Combustion Chambers ◽  
New Approach ◽  
High Temperature Alloys ◽  
Component Design ◽  
Turbine Design

In order to achieve a thermal efficiency in the gas turbine comparable with that realized in steam practice, a higher turbine-entry temperature is necessary. Limiting discussion to the combustion and expansion sections of the gas turbine, the paper first indicates that the use of metals in high temperature and stress conditions necessitates a new approach to component design. The phenomena of creep and fatigue assume major importance whilst pure temperature effects, such as expansion and thermal shock, are additional problems. These properties are defined and an indication is given of their significance in the design of combustion chambers, turbine wheels, and blades. Susceptibility to heat treatment, intended to induce the desired high-temperature properties, is another important factor to be considered in material selection, as are fabrication characteristics. Since the latter govern both detail and general design, the merits of forging, casting, and welding are outlined when applied to high-temperature alloys. The paper concludes with a survey of the problems likely to be encountered with future materials, particularly ceramics, whilst suggesting that increased efficiency may be obtained by further research on established alloys or by design innovations such as cooling.

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