Abstract
The changing role of coal-fired power units which are now used more and more often as sources balancing the demand for electricity in the power system calls for a change in the character of their operation. They have to be able to respond appropriately to rapid and substantial variations in loads and they must have the capacity for shortening the start-up time, especially after a few or several hours of downtime. The paper presents an analysis of changes in thermal states in the turbine main elements after short downtime periods and shows the possibilities and consequences of the turbine fast start-up from such states. Optimal warm and hot start-up characteristics are developed. Detailed deliberations are devoted to elements of200 MW turbines, most of which are and will be used as flexible sources of electricity generation in the power system.
Highlights
The changing structure of power systems and the new role of coal-fired power units which more and more often act as sources balancing the demand for electricity call for a change in the character of their operation [1]
The further part of this paper presents a discussion of problems related to the optimization of warm and hot start-ups, as start-ups from these thermal states will become dominant in the current operating conditions of power plants
The model of the turbine start-up optimization presented above indicates that the process of heating the turbine main elements can be accelerated safely, which means that it is possible to shorten the start-up time
Summary
The changing structure of power systems and the new role of coal-fired power units which more and more often act as sources balancing the demand for electricity call for a change in the character of their operation [1]. This means that coal-fired power units have to be able to respond appropriately to rapid and substantial variations in loads and they must have the capacity for shortening the start-up time, especially after a few or several hours of downtime Considering that these requirements increase the thermal load of individual elements of power units and taking account of the relatively long service life, new and optimal operating conditions have to be determined to ensure adequate safety of the power plant future operation in the new analysis under cold start-up conditions to establish an online damage-monitoring model of a steam turbine rotor. Numerical models of the turbine elements, as well as details of thermal and flow analyses and the selection of boundary conditions, are described e.g. in [12, 13]
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