Method for cold starting a steam turbine

A steam turbine and cold start technology, applied to engine functions, steam engine devices, engine components, etc., to achieve the effects of improving personnel safety, simplifying equipment, and shortening warm-up time

Inactive Publication Date: 2011-11-09
ALSTOM TECH LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For this reason, the heating rate can be the time-limiting factor in the cold start of a steam turbine

Method used

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  • Method for cold starting a steam turbine
  • Method for cold starting a steam turbine
  • Method for cold starting a steam turbine

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Embodiment Construction

[0014] Exemplary embodiments of the present disclosure will now be described with reference to the drawings, in which like reference numerals are used to refer to like elements. In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure. However, the present disclosure may be practiced without these specific details and is not limited to the exemplary embodiments disclosed herein.

[0015] figure 1 An exemplary embodiment of a steam turbine component 10 with a heating system is shown. The purpose of the heating system is to preheat the component 10 to a desired temperature, for example to start or restart the steam turbine 20, while limiting thermal stress within the component 10 to an acceptable level.

[0016] In the exemplary embodiment, steam turbine component 10 is made of an electrically conductive material. This allows the component 10 to facilitate eddy cur...

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Abstract

The disclosure relates to a method for cold starting a steam turbine by preheating a steam turbine component using eddy currents. The process includes providing an electrically conducting steam turbine component (10), an electro-magnetic coil (18), and a supply of AC to the coil (18). The coil (18) is located relative to the component (10) so that the coil (18) is capable of forming eddy currents in the component (10). In this location, an AC current is passed through the coil thus heating the component (10).

Description

technical field [0001] The present disclosure relates generally to methods of cold starting a steam turbine and in particular to the warm-up step of the start-up process. Background technique [0002] Preheating live steam valves is mandatory in ultra-supercritical (USC) pressure power plants to limit the thermal stress on the valve box. [0003] For a typical cold start, the difference between the valve body temperature and the saturation temperature at turbine startup typically exceeds 280°C. Such a large temperature difference limits cold starts. Without preheating, the application of live steam to the valve during cold start-up would lead to rapid condensation heating of the inner surface of the valve and thus high thermal stress. This high stress can significantly reduce the life of the valve. This problem can be overcome by minimizing the difference between the saturated steam temperature and the metal temperature by preheating the valve during cold start. [0004]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01D25/10
CPCF01K13/02B24B49/105F05B2260/85F01D25/10F05B2220/301F05D2260/85F05D2220/31
Inventor M·科勒
Owner ALSTOM TECH LTD
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