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.
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.
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 ...
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 ...
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 ...
Introduction to steam turbines for power plants - ScienceDirect
2022年1月1日 · Electric power generation is one of the main applications of steam turbines. Since increasing temperature and pressure of turbine inlet steam increase thermal efficiency, inlet steam pressures range from 24.1 to 33.0 MPa·g (mega Pascal plus atmospheric pressure), and temperatures range from 593°C/593°C [HP turbine inlet/intermediate-pressure (IP) turbine inlet] to 610°C/630°C in typical ...
9 - Steam turbine design for load-following capability and highly ...
2022年1月1日 · The response time of a high-pressure (HP) turbine (about 30% of the total steam flow) during governor-free operation is about 1 second. For the intermediate pressure–low pressure turbine (about 70% of the total steam flow), time delay is about 10–30 seconds, due to thermal inertia of the reheater.
Research on the steam power system operation condition …
2023年12月1日 · Firstly, the normal and abnormal operation data of the steam turbine unit were obtained through the simulation model of the nuclear power secondary circuit system. Based on simulation data, carry out PCA-AE operation condition …
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.