Steam turbines: operating conditions, components and material ...
2014年1月1日 · The evolution of steam turbine operating conditions is shown in Fig. 2.1. 1 Periodically the operating limit necessitates a step change in material selection in order to accommodate new design parameters, hence new alloys have been developed and introduced regularly since the mid-20th century. This is a long process, requiring long-term testing ...
Steam Turbines - an overview | ScienceDirect Topics
The steam turbine is the primary mechanical device (sometimes called the prime mover) in most conventional coal-fired power stations. Its job is to convert the heat energy contained in the steam exiting the boiler into mechanical energy, rotary motion. The steam turbine first appeared in power applications at the end of the 19th century.
Improving the power unit operation flexibility by the turbine start …
2020年5月1日 · Once the rise in steam parameters is under control and thermal stresses are reduced, the start-up process can be continued according to optimized start-up characteristics. This start-up method makes it possible to shorten the process and, thereby, to improve the turbine and the entire power unit operation flexibility.
Digital twin modeling and operation optimization of the steam …
2024年3月1日 · The operation optimization of cold end system is to balance the tradeoff between the energy consumption of circulating pumps and the steam turbine output power. When the power load is 740 MW, the STS energy efficiency is higher for the cold end system with one circulating pump.
Steam Turbine - an overview | ScienceDirect Topics
One of the more critical aspects of steam turbine operation is related to the following start-up procedures. HP and temperature units require proper warmup in order to avoid high thermal stress across thick portions of casing and also to prevent uneven thermal growth which can lead to internal alignment issues.
Failure study of steam turbine Last-Stage rotor blades under a …
2023年12月1日 · In recent years, with the operation of high-power steam turbines with larger airfoil LSRBs and larger flow rates of wet steam, cracks have been found in the inlet side shroud-lacing wire section, as shown in Fig. 1 (a), and a large number of pits with diameters less than 1 mm have been found on the convex surface of the inlet side of this ...
A steam turbine dynamic model for full scope power plant …
2017年6月25日 · Finally, it is worth emphasizing that, once known the energy storage volume exit conditions, i.e., the conditions at the entry of the steam storage volume, the steam turbine section dynamics and exit conditions are computed following a similar approach to that used in the case of the normal operation mode (Section 2.1). Nevertheless, since both ...
Damage-driven framework for reliability assessment of steam …
In the process of power grid peak regulation, the steam turbine unit is required to participate in two-shift operation that the start-stop frequency is higher than that of normally-serviced units. Especially, the start-stop cycles of rotor are increased within the same time interval through increasing its frequency, which accelerate the fatigue ...
Steam turbine monitoring technology, validation, and verification …
2017年1月1日 · All steam turbine OEM’s issue required water and steam cycle chemistry limits in order to minimize deposits and corrosion throughout the steam plant, including boiler, turbine, and condenser. Typically steam purity limits are provided for …
Steam Turbine - an overview | ScienceDirect Topics
In gas turbine–steam combined cycle plant, the gas turbine exhaust, typically 750 K and containing 13–15% O 2, raises steam in a heat recovery steam generator for producing power in a steam turbine and/or heat in cogeneration. Because of the complementary temperature ranges of the Brayton (1600–900 K) and Rankine (850–288 K) cycles ...